JP6525827B2 - Stress recording medium - Google Patents

Description

  The present invention is provided with a sensitive luminous body that emits light when a stress is transmitted to the subject in a state where the stress generated in the subject is transmitted, and the photosensitive luminous body emits light by receiving light. The present invention relates to a stress recording medium that includes a light reaction history recording body that generates a light reaction and records the history of the light reaction in a state in which light emitted by the sensitive light emitter is received.

It is important in various technical fields, including the design field of machines and structures, to measure the magnitude of stress generated in each part of an object made of metal or the like. Therefore, various techniques have already been developed to measure stress distribution. As a main method, conventionally, a method of measuring a stress by attaching a strain gauge to an object to be measured is generally used. However, in this method, only information related to the strain at the place where the strain gauge is attached In order to obtain stress distribution, strain gauges need to be attached to a large number of measurement points. In addition, in this method, it takes time and labor to attach a large number of strain gauges, and when the object is small, sometimes the strain gauges can not be attached due to the size of the strain gauges, and the stress in a minute region There were drawbacks such as the inability to measure the distribution.
Therefore, conventionally, a coating film forming substance in which a light-sensitive resin is mixed with a sensitive light-emitting body that emits light when a stress such as a compressive stress, a tensile stress or a shear stress is transmitted is applied to the surface of a subject There is known a technique for visualizing stress applied to a subject (see Patent Document 1).
However, although the currently known sensitive light emitters continue to emit light until the mechanical energy stored therein is consumed as the stress is transmitted, the light emission takes place after the mechanical energy is consumed. It is stopped. For this reason, in order to know the history of stress transfer to the subject, it has been necessary to continuously monitor the film-forming substance applied to the subject.
Therefore, in the technology disclosed in Patent Document 2, a sensitive light-emitting body that emits light when stress is transmitted is provided to the object in a state where stress generated in the object is transmitted. It is known that a photoreaction history recording body for producing a photoreaction by receiving light emitted by the body and recording a history of the photoreaction in a state of receiving light emission by a sensitive light emitter is known.
To add the explanation, the photoreaction history recording material is composed of a photoreactive substance whose absorption spectrum changes in photoreaction, and the photoreactive substance is, for example, a first photoreactive substance having a first absorption spectrum. It is composed of a substance that is structurally changed to a second photoreactor having a second absorption spectrum different from the first absorption spectrum by the photoreaction by the light of the first wavelength band emitted by the sensitive light emitter.
By providing the above-described configuration, when there is a history in which stress is applied to the subject, the light response recording body receives the light emitted by transmitting the stress to the sensitive light emitter, thereby providing a light response recording body The photoreactive substance structurally changes from the first photoreactant having the first absorption spectrum to the second photoreactor having the second absorption spectrum different from the first absorption spectrum.
On the other hand, when there is no history of stress applied to the subject, the photoreactive substance maintains the first photoreactive substance having the first absorption spectrum.
As a result, when the photoreactive material as the photoreactive recording material is irradiated with detection light having a wavelength band other than the first wavelength band that is the wavelength band of the light emitted from the sensitive light emitter, stress is applied to the subject If there is a history of light, light transmitted through the first photoreactant having the first absorption spectrum is obtained, and if there is no history of stress applied to the subject, the second light having the second absorption spectrum is obtained. Since light transmitted through the photoreactant is obtained, it is possible to know the history of stress applied to the subject by performing spectral analysis of both.
Incidentally, when the first absorption spectrum and the second absorption spectrum are different in the visible light region, the presence or absence of stress history on the subject appears as a change in color of the light-sensitive recording material, so visually check the light-sensitive recording material. It is possible to confirm the presence or absence of stress history.

JP 2001-215157 A WO 2007/105539

  However, in the technology disclosed in Patent Document 2, when the light of the first wavelength band causing photoreaction in the photoreaction history recording body is irradiated to the photoreaction history recording body from other than the sensitive light emitter. Since the photoreaction substance as the photoreaction history recording body is changed from the first photoreaction body to the second photoreaction body even though the stress is not applied to the subject, the appropriate stress history recording is performed. There was a case that could not.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is a case where light of a first wavelength band which causes a photoreaction in a photoreaction history recording body is irradiated from the outside to a subject. Provided is a stress recording body capable of appropriately preventing occurrence of photoreaction in a photoreaction history recording body, and appropriately recording the history of stress applied to a subject by the photoreaction history recording body. It is.

The stress recording material for achieving the above purpose is
A sensitive light-emitting body that emits light when a stress is transmitted is provided to the subject in a state where the stress generated in the subject is transmitted,
A stress recording body including a photoreaction history recording body for producing a photoreaction by receiving light emitted by the sensitive light emitter and recording a history of the photoreaction in a state of receiving light emission by the sensitive light emitter And its characteristic configuration is
A light blocker which prevents light of a first wavelength band causing at least the photoreaction history recording body from light other than the sensitive light emitter to cause the light reaction history recording body to be incident on the photoreaction history recording body provided,
A first powder body having the photoreaction history recording body on the outer surface of the powdery sensitive light emitter;
And a film-forming material mainly composed of a light transmitting resin,
Providing the coating film-forming substance containing the first powder body inside a stress detection target portion of the subject;
The light blocking member is provided in a state in which both the stress detection target portion of the subject and the coating film forming material are enclosed .

According to the above feature configuration, the sensitive light-emitting body that emits light when the stress is transmitted is provided to the subject in a state where the stress generated in the object is transmitted, and the light-receiving of the light emitted by the sensitive light-emitting body In a stress recording body provided with a photoreaction history recording body for producing a photoreaction and recording the history of the photoreaction in a state of receiving light emission by the sensitive light emitter, light from other than the sensitive light emitter, Since the light of the first wavelength band causing photoreaction in at least the photoreaction history recording body is provided with the light blocker which prevents the light reaction history recording body from being incident, the light which is not derived from the sensitive light emitter, It is possible to satisfactorily prevent the light of the first wavelength band causing photoreaction in the photoreaction history recording body from reaching the light reaction history recording body. As a result, when stress is not applied to the subject, it is possible to prevent the occurrence of photoreaction in the photoreaction history recording medium.
As a result, even when light from the first wavelength band that causes the photoreaction history recording body to emit light reaction is externally applied to the subject from the outside, it is appropriately prevented that the light reaction history recording body generates the light reaction. Thus, it is possible to realize a stress recording body capable of appropriately recording the history of the stress applied to the subject by the light response recording body.

Furthermore, according to the above characteristic construction, the inside of the film forming material of the first powder material, mainly composed of light transparent resin having a photoreactive history recording material on the outer surface of the powdery end shaped-sensitive luminescent material The stress applied to the object is transmitted to the sensitive light emitter, for example, by appropriately setting the hardness of the resin of the coating film-forming substance, since the stress detection target site of the object is provided in the state of The state can be realized relatively easily. In addition, since the photoreaction history recording body is positioned on the outer surface of the sensitive light emitter, the light reaction history recording body can satisfactorily receive the light emitted from the sensitive light emitter.
In addition, the coating film-forming substance is made of resin, and can be applied to the subject, or formed into a film and attached to the subject, so the stress detection target site of the subject is a large area It can be provided well for any of the minute regions.
Furthermore, since the light blocker is provided in a state of surrounding both the stress detection target portion of the subject and the coating film forming substance, the light reaction history recording body causes a light reaction with light which is not derived from the sensitive light emitter. It is possible to well prevent light in the first wavelength band to be transmitted from reaching directly to the light reaction history recording material and from being indirectly reflected by reflecting on the object.
In the present invention, for example, since the coating film-forming substance is mainly composed of a light transmitting resin, the stress history can be confirmed by directly observing the light reaction history recording body if the light blocking member is removed. .

The stress recording material for achieving the above purpose is
A sensitive light-emitting body that emits light when a stress is transmitted is provided to the subject in a state where the stress generated in the subject is transmitted,
A stress recording body including a photoreaction history recording body for producing a photoreaction by receiving light emitted by the sensitive light emitter and recording a history of the photoreaction in a state of receiving light emission by the sensitive light emitter And its characteristic configuration is
A light blocker which prevents light of a first wavelength band causing at least the photoreaction history recording body from light other than the sensitive light emitter to cause the light reaction history recording body to be incident on the photoreaction history recording body Equipped
It has a coating film forming material mainly composed of a light transmitting resin,
Providing the coating film-forming substance including the powdery light-sensitive luminescent material and the powdery photoreaction history recording material on a stress detection target portion of the subject;
The light blocking member is provided in a state in which both the stress detection target portion of the subject and the coating film forming material are enclosed.

According to the above-mentioned feature configuration, since the coating film forming substance including the powdery sensitive light emitter and the powdery photoreaction recording material is provided on the stress detection target portion of the subject, for example, as a resin of the coating film forming substance By adopting the one having a certain hardness or more, it is possible to relatively easily realize the state in which the stress applied to the subject is transmitted to the sensitive light emitter. In addition, since the photoreaction history recording body is positioned on the outer surface of the sensitive light emitter, the light reaction history record can well receive the light emitted from the sensitive light emitter.
In addition, the coating film-forming substance is made of resin, and can be applied to the subject, or formed into a film and attached to the subject, so the stress detection target site of the subject is a large area It can be provided well for any of the minute regions.
Furthermore, since the light blocker is provided in a state of surrounding both the stress detection target portion of the subject and the coating film forming substance, the light reaction history recording body causes a light reaction with light which is not derived from the sensitive light emitter. It is possible to well prevent light in the first wavelength band to be transmitted from reaching directly to the light reaction history recording material and from being indirectly reflected by reflecting on the object.
In the present invention, for example, since the coating film-forming substance is mainly composed of a light transmitting resin, the stress history can be confirmed by directly observing the light reaction history recording body if the light blocking member is removed. be able to.

The stress recording material for achieving the above purpose is
A sensitive light-emitting body that emits light when a stress is transmitted is provided to the subject in a state where the stress generated in the subject is transmitted,
A stress recording body including a photoreaction history recording body for producing a photoreaction by receiving light emitted by the sensitive light emitter and recording a history of the photoreaction in a state of receiving light emission by the sensitive light emitter And its characteristic configuration is
A light blocker which prevents light of a first wavelength band causing at least the photoreaction history recording body from light other than the sensitive light emitter to cause the light reaction history recording body to be incident on the photoreaction history recording body Equipped
A second powder body having the photoreaction history recording body on the outer surface of the powdery light-sensitive light emitter, and having the light blocker covering the outer surface of the photoreaction history recording body;
And a film-forming material mainly composed of a light transmitting resin,
The coating film-forming substance containing the second powder body therein is provided at a stress detection target portion of the subject.

According to the above-mentioned characteristic configuration, the inside of the coating film forming material which is usually composed of a very thin film of about several microns and is not highly durable and which can give the light blocker, for example, relatively high strength Can be well prevented from damaging the light blocker.
Thereby, it is possible to well prevent the light from the outside from being irradiated to the photoreaction stress recording material.

Further features of the stress record are:
The photoreaction history recording material is composed of a photoreaction substance whose absorption spectrum changes in the photoreaction,
The amount of the photoreactive substance whose absorption spectrum changes due to the photoreaction is generated in proportion to the temporally integrated value of the intensity of the light in the first wavelength band received by the photoreactive substance.

  According to the above-mentioned feature configuration, it is a photoreaction substance as a photoreaction history recording material, and the amount of the photoreaction substance whose absorption spectrum is changing is measured (for example, the color is visually confirmed). The integrated value of the stress history generated at the stress detection target portion can be accurately known.

Further features of the stress record are:
The photoreaction history recording material is composed of a photoreaction substance whose absorption spectrum changes in the photoreaction,
The photoreactive substance has a second absorption spectrum different from the first absorption spectrum by a photoreaction from light of a first wavelength band emitted from the sensitive light emitter from the first photoreaction body having the first absorption spectrum. A substance that changes to a second photoreactant,
The second wavelength band having a difference between the absorbance of the first absorption spectrum and the absorbance of the second absorption spectrum is a wavelength band different from the first wavelength band,
The light blocking member blocks light in the first wavelength band and transmits light in the second wavelength band.

According to the above-mentioned feature configuration, the light blocking member can well prevent the light reaction history recording body from being irradiated with the light causing the photoreaction substance as the light reaction history recording body to cause the light reaction. Furthermore, since light of the second wavelength band is transmitted, it is possible to detect from the outside that the absorption spectrum of the photoreaction material as the photoreaction history recording material is changed by the photoreaction.
Thereby, the stress history of the subject can be favorably confirmed from the outside without removing the light blocking member.

Conceptual view of a stress recording medium according to the first embodiment Graph showing the emission spectrum of light emitted by strontium aluminate (SrAl ₂ O ₄ : Eu ^{2 +} ) as a sensitive light emitter when stress is applied Closed-ring form (right figure) and ring-opened form (left figure) of 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidenesuccinic anhydride as photoreaction history record Diagram showing chemical formula Graph showing absorption spectrum of a closed ring form of 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidenesuccinic anhydride Graph showing the absorption spectrum of the ring-opened product of 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidenesuccinic anhydride Conceptual view of a stress recording medium according to the second embodiment Conceptual view of a stress recording medium according to the third embodiment Conceptual diagram of stress recording material according to the reference form

The stress recording body 100 according to the embodiment of the present invention is a light even when the light of the first wavelength band causing the photoreaction history recording body 2 to cause a photoreaction to the subject K from the outside. It is possible to appropriately prevent the photoreaction from occurring in the reaction history recording body, and appropriately record the history of the stress applied to the subject K by the light reaction history recording body 2.
Hereinafter, the stress recording medium 100 will be described based on the drawings.

As shown in FIG. 1, the stress recording material 100 transmits the sensitive light-emitting body 1 that emits light when stress is transmitted to the subject K in a state where stress generated in the subject K such as gas piping is transmitted. And a photoreaction history record body 2 for generating a photoreaction by receiving light emitted from the sensitive light emitter 1 and recording a history of the photoreaction in a state of receiving light emitted by the sensitive light emitter 1, The light blocker 3 is configured to block the light reaction history recording body 2 from entering at least the light of the first wavelength band that causes the light reaction history recording body 2 to cause a light reaction with light from other than the sensitive light emitter 1. Have.
To add the description, in the stress recording body 100 according to the first embodiment, the first powder body F1 having the light reaction history recording body 2 on the outer surface of the powdery sensitive light emitter 1, and the light transmittance A film-forming substance 4 containing as a main component a resin of the present invention and including the first powder body F1 directly applied to a stress detection target portion of the subject K or a state in which the film-forming substance 4 is directly attached The light blocking member 3 is provided in a state in which both the stress detection target portion of the subject K and the coating film forming substance 4 are enclosed.
In addition, in FIG. 1, the light-shielding body 3 has shown the state directly apply | coated to the coating-film formation substance 4, or the state directly affixed. However, in a state where there is a space between the film-forming substance 4 and the light-blocking body 3 made of a film-like substance, the stress of the film-forming substance 4 and the subject K is You may comprise so that a detection object site | part may be covered.

[Sensitive light emitter]
A matrix structure formed by a plurality of molecules having at least an AlO ₄ -like structure and a tetrahedral structure of SiO ₄ -like structure as the sensitive light emitter 1 by sharing atoms at the apex of the tetrahedral structure. And a basic structure in which at least one of an alkali metal ion and an alkaline earth metal ion is inserted in the space, and at least one of the alkali metal ion and the alkaline earth metal ion inserted in the space is a rare earth What is substituted by at least 1 sort (s) of metal ion of a metal ion and a transition metal ion can be used suitably.
With regard to the alkali metal ions and the alkaline earth metal ions inserted into the space in the matrix structure in the material, one kind or two or more kinds of the ions may be inserted. That is, the ions inserted into the above space are ions of metals selected from the group of alkaline earth metals such as Ca, Mg, Ba, Sr, and alkali metals such as Li, Na, K, Rb, Cs, etc. There should be at least one.
Furthermore, the substituted rare earth metal ion or transition metal ion can be obtained by substituting a part of the above ions inserted into the space of the matrix structure with at least one metal ion of rare earth metal ion and transition metal ion. The light emitting center (light emitting center ion) in the stress light emitter, and as a result, the stress light emitter has a function of emitting light.
The rare earth metal ion and the transition metal ion are not particularly limited as long as they can be light emission centers, and examples of the rare earth metal ion include europium (Eu), dipiclosium (Dy), lanthanum (La), gadolinium (Gd) ), Cerium (Ce), samarium (Sm), yttrium (Y), neodymium (Nd), terbium (Tb), praseodymium (Pr), erbium (Er), thulium (Tm), ytterbium (Yb), scandium (Sc) And ions of rare earth metals such as promethium (Pm), holmium (Ho) and lutetium (Lu). Further, as ions of transition metals, chromium (Cr), manganese (Mn), iron (Fe), antimony (Sb), titanium (Ti), zirconium (Zr), vanadium (V), cobalt (Co), nickel Examples include ions of transition metals such as (Ni), copper (Cu), zinc (Zn), niobium (Nb), molybdenum (Mo), tantalum (Ta), and tungsten (W). As the rare earth metal ion and the transition metal ion, at least one ion may be selected from the above-listed ions.

As another example of the sensitive light-emitting body 1, in (Ba, Ca) TiO ₃ in which a part of Ba is substituted by Ca with barium titanate (BaTiO ₃ ), a part of Ba or Ca is an emission center Those obtained by substituting the obtained rare earth metal ion and transition metal ion with at least one metal ion can be employed, and as the at least one of the rare earth metal ion and the transition metal ion, those described above can be suitably adopted.

[Photoreaction history record]
As the photoreaction history recording body 2, one that causes a photoreaction by receiving the light emitted from the above-described sensitive light emitter 1 is appropriately selected. Examples of the substance that causes a photoreaction include, but are not limited to, dyes, inorganic photochromic materials, organic photochromic materials, and the like. In the specification, the light reaction means that the light of the first wavelength band emitted by the above-mentioned sensitive light emitter 1 is received to cause at least one of physical change and chemical change. Do.

  Specific examples of the photoreaction history recording material 2 include barium magnesium silicate as the inorganic photochromic material, and azobenzenes, spiropyrans, flugides, and siarylethenes as the organic photochromic material. It is not limited to these.

In addition, as shown in FIG. 1, the first powder body F1 having the photoreaction history recording body 2 on the outer surface of the powdery light-sensitive luminous body 1 is a film-forming material mainly composed of a light transmitting resin. Included in 4.
That is, in the first powder body F1, the film-forming substance 4 including the first powder body F1 is applied to the subject K, or the film-forming substance 4 including the first powder body F1 is formed into a film The subject matter is fixed to the subject K in a form to be stuck to the subject K.
In order to appropriately transmit the stress applied to the subject K to the sensitive light-emitting body 1, a material having a certain hardness or more is defined and selected, and, for example, an acrylic resin or an epoxy resin is preferable. Will be adopted.

[Light blocker]
As the light blocking member 3, one that blocks light of a first wavelength band that causes a photoreaction to occur at least in the light reaction history recording member 2 is used. More preferably, it is preferable to block all the light in the wavelength band that causes the light reaction history recording body 2 to change in structure.
Specifically, a film having a wavelength selective blocking property having a dielectric multilayer film can be mentioned as one having a wavelength selective blocking property that selectively blocks light in the first wavelength band, and it is possible to substantially include the first wavelength band. Materials that block light in all wavelength bands include materials such as resins in which carbon black is dispersed, films and paints in which metals are dispersed, but the present invention is not limited thereto.

[Example of preferred combination]
As an example of the suitable combination of the sensitive light-emitting body 1 mentioned above, the light reaction history recording body 2, and the light blocker 3, there exist the following.
The sensitive emitter 1, tensile stress, compressive stress, as the luminous intensity mechanical action force is large, such as shear stress becomes stronger, strontium aluminate having the emission spectrum shown in Figure 2: a (SrAl2O 4 _Eu ²⁺⁾ It can be used.
As the photoreaction history recording body 2, as shown in FIG. 3, a photoreaction is caused by irradiation with visible light to form a ring-opened body (second photoreactant) from a ring-closed body (example of the first photoreactor) 2- [1- (2,5-Dimethyl-3-thienyl) ethylidene] -3-isopropylidenesuccinic anhydride, which changes its structure to Incidentally, the closed ring (first photoreactant) exhibits an absorption spectrum as shown in FIG. 4 and the ring-opened body (second photoreactant) exhibits an absorption spectrum as shown in FIG. In the lower part, the closed ring (first photoreactant) becomes colorless and transparent, and the open ring (second photoreactant) exhibits a reddish color because it transmits visible light having a wavelength of 600 nm or more. Become.
By the way, as shown in FIG. 3, 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidene succinic anhydride is a ring-opened compound (by irradiation with ultraviolet light). The structural change from the second photoreactant to the closed ring (first photoreactant).
Therefore, as the light blocking member 3, for example, a dielectric multilayer film filter configured to block both ultraviolet light and visible light can be used.

By adopting the above combination, first, the object K provided with the stress recording material 100 is maintained in a state where the light blocking member 3 is prevented from being irradiated with ultraviolet light and visible light from the outside. Be done. Therefore, in this state, 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidene succinic anhydride as the photoreaction history recording material 2 is a ring-opened compound ( Furthermore, without causing a photoreaction from the first photoreactant) to the ring-closed body (second photoreactant), the reverse from the ring-closed body (second photoreactant) to the ring-opened body (first photoreactant) There is no reaction.
By the way, 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidenesuccinic anhydride as the photoreaction history recording material 2 is not surrounded by the light blocker 3. It is made into a closed-ring body (1st photoreactant), for example, by irradiating an ultraviolet light.
In this state, when stress is applied to the subject K, the stress is transmitted to strontium aluminate (SrAl2O4: Eu ²⁺ ) as the sensitive light emitter 1, and the sensitive light emitter 1 is visible as shown in FIG. It emits light having a maximum wavelength in the light region, and the visible light is converted to 2- [1- (2,5-dimethyl-3-thienyl) ethylidene] -3-isopropylidene succinic acid as the light reaction history recording material 2 Anhydride receives light, and the light reaction history recording material 2 changes from a transparent to a reddish color by photoreaction from a closed ring (first photoreactor) to an open ring (second photoreactor). And change.
Then, for example, according to the state, the light blocking member 3 is removed, and the light reaction history recording member 2 is checked visually, etc., and if colorless and transparent, there is no history that stress is applied to the subject K If it can be judged and the color is reddish, it can be judged that there is a history in which stress is applied to the subject K.

  As the photoreaction history recording body 2, the light reaction history recording body 2 has an amount of change from the first photoreactant to the second photoreactant due to light reaction (the amount of photoreaction substance whose absorption spectrum changes). Preferably, it is generated in proportion to a temporally integrated value of the intensity of the light of the first wavelength band to be received.

[Another embodiment]
(1) As another structural example of the stress recording body 100, as shown in FIG. 6, it comprises a coating film forming substance 4 mainly composed of a light transmitting resin, and a powdery sensitive light emitter 1 and a powder are provided. The film-forming substance 4 including the light-sensitive history record body 2 in the form of a circle is provided in a state where it is directly applied or directly attached to a stress detection target portion of the subject K. The structure which provides the light-blocking body 3 in the state which encloses both of the formation substances 4 is employable.
In addition, in FIG. 6, the light-shielding body 3 has shown the state directly apply | coated to the film-forming substance 4, or the state directly affixed. However, in a state where there is a space between the film-forming substance 4 and the light-blocking body 3 made of a film-like substance, the stress of the film-forming substance 4 and the subject K is You may comprise so that a detection object site | part may be covered.

(2) As another structural example of the stress recording body 100, as shown in FIG. 7, while having the photoreaction history recording body 2 on the outer surface of the powdery sensitive light emitter 1, the photoreaction history recording body 2 A film forming material comprising a second powder body F2 having a light blocking member 3 covering the outer surface of the film, and a coating film forming material 4 mainly composed of a light transmitting resin, and including the second powder body F2 inside A configuration in which 4 is applied directly to the stress detection target portion of the subject K or in a state of being directly attached can be adopted.
In the said structure, when confirming the structural change of the light reaction history recording body 2 like embodiment mentioned above, the light blocker 3 can not be removed.
So, in the said another embodiment (2), even if it does not remove the light-blocking body 3, the material which can confirm the structural change of the light reaction history recording body 2 is employ | adopted.
That is, the photoreaction history recording body 2 is composed of a photoreactive substance whose absorption spectrum changes in photoreaction, and the photoreactive substance is a sensitive light emitter 1 from the first photoreactive body having the first absorption spectrum. A substance which changes to a second photoreactant having a second absorption spectrum different from the first absorption spectrum by light reaction with light of a first wavelength band emitted by the light source, and the absorbance of the first absorption spectrum and the absorbance of the second absorption spectrum The second wavelength band different from the first wavelength band is different from the first wavelength band.
Furthermore, the light blocking member 3 employs a material that blocks light in the first wavelength band and transmits light in the second wavelength band.
As an example of the suitable combination of the sensitive light-emitting body 1 which concerns on the said another embodiment, the light reaction history recording body 2, and the light blocker 3, there exist the following.
Strontium aluminate (SrAl ₂ O ₄ : Ce) that emits ultraviolet light (central wavelength: 375 nm) when stressed can be suitably used as the sensitive light emitter 1.
The photoreaction history recording material 2 is photo-reacted by irradiation with ultraviolet light, and changes from colorless to colored by changing the absorption spectrum, and the change of the absorption spectrum is an irreversible reaction; UV label (registration Trademarks: NOF Giken Kogyo Co., Ltd. can be suitably used.
As the light blocking member 3, it is preferable to use an ultraviolet light cut-off filter that blocks ultraviolet light emitted when the above-mentioned strontium aluminate (SrAl ₂ O ₄ : Ce) as the sensitive light emitting member 1 receives stress. it can.
Thus, it is possible to satisfactorily prevent the photoreaction of the photoreaction history recording body 2 by light from the outside without removing the light blocking body 3 and to confirm the structural change of the photoreaction history recording body 2 from the outside. it can.
The configurations disclosed in the above embodiment (including the other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in the present specification is an exemplification, and the embodiment of the present invention is not limited thereto, and can be appropriately modified without departing from the object of the present invention.

Hereinafter, although not included in the right scope of the present invention, a configuration according to the reference embodiment is shown.
As a reference form of the stress recording body 100, as shown in FIG. 8, the first film body including the sensitive light emitter 1, the second film body including the light reaction history recording body 2, and the light shield 3 are included. There is a configuration in which the third film body is stacked on the stress detection target portion of the subject K in the order described .
A state in which the sensitive light emitter 1, the light reaction history record body 2, and the light blocker 3 are sequentially applied to the subject K in the lamination of the first film body, the second film body and the third film body. , or it can be realized by Ru form state that provided in a state to be pasted in the order.
In addition to the coating method, physical film deposition can be used to adhere to the outer surface of the subject K. Specifically, for example, ion plating, sputtering, ion mixing, vapor deposition, and the like can be used .

  The stress recording medium of the present invention is capable of causing the light reaction history recording medium to react with light even when light from the first wavelength band that causes the light reaction history recording medium to generate a light reaction is externally applied to the subject. Can be appropriately used as a stress recording body capable of appropriately preventing occurrence of stress and appropriately recording the history of the stress applied to the subject by the photoreaction history recording body.

1: Sensitive luminescent material 2: Photoreaction history recording material 3: Light blocking material 4: Film forming material F1: first powder F2: second powder K: object 100: stress recording

Claims (5)

A sensitive light-emitting body that emits light when a stress is transmitted is provided to the subject in a state where the stress generated in the subject is transmitted,
A stress recording body including a photoreaction history recording body for producing a photoreaction by receiving light emitted by the sensitive light emitter and recording a history of the photoreaction in a state of receiving light emission by the sensitive light emitter And
A light blocker which prevents light of a first wavelength band causing at least the photoreaction history recording body from light other than the sensitive light emitter to cause the light reaction history recording body to be incident on the photoreaction history recording body provided,
A first powder body having the photoreaction history recording body on the outer surface of the powdery sensitive light emitter;
And a film-forming material mainly composed of a light transmitting resin,
Providing the coating film-forming substance containing the first powder body inside a stress detection target portion of the subject;
A stress recording member in which the light blocking member is provided in a state in which both the stress detection target portion of the subject and the coating film forming substance are enclosed . A sensitive light-emitting body that emits light when a stress is transmitted is provided to the subject in a state where the stress generated in the subject is transmitted,
A stress recording body including a photoreaction history recording body for producing a photoreaction by receiving light emitted by the sensitive light emitter and recording a history of the photoreaction in a state of receiving light emission by the sensitive light emitter And
A light blocker which prevents light of a first wavelength band causing at least the photoreaction history recording body from light other than the sensitive light emitter to cause the light reaction history recording body to be incident on the photoreaction history recording body Equipped
It has a coating film forming material mainly composed of a light transmitting resin,
Providing the coating film-forming substance including the powdery light-sensitive luminescent material and the powdery photoreaction history recording material on a stress detection target portion of the subject;
A stress recording member in which the light blocking member is provided in a state in which both the stress detection target portion of the subject and the coating film forming substance are enclosed . A sensitive light-emitting body that emits light when a stress is transmitted is provided to the subject in a state where the stress generated in the subject is transmitted,
A stress recording body including a photoreaction history recording body for producing a photoreaction by receiving light emitted by the sensitive light emitter and recording a history of the photoreaction in a state of receiving light emission by the sensitive light emitter And
A light blocker which prevents light of a first wavelength band causing at least the photoreaction history recording body from light other than the sensitive light emitter to cause the light reaction history recording body to be incident on the photoreaction history recording body Equipped
A second powder body having the photoreaction history recording body on the outer surface of the powdery light-sensitive light emitter, and having the light blocker covering the outer surface of the photoreaction history recording body;
And a film-forming material mainly composed of a light transmitting resin,
A stress recording material, wherein the coating film forming material containing the second powder body inside is provided at a stress detection target portion of the subject . The photoreaction history recording material is composed of a photoreaction substance whose absorption spectrum changes in the photoreaction,
The amount of the photoreactive substance whose absorption spectrum changes due to the photoreaction is generated in proportion to a temporally integrated value of the intensity of the light in the first wavelength band received by the photoreactive substance. Stress record body as described in any one of Claims . The photoreaction history recording material is composed of a photoreaction substance whose absorption spectrum changes in the photoreaction,
The photoreactive substance has a second absorption spectrum different from the first absorption spectrum by a photoreaction from light of a first wavelength band emitted from the sensitive light emitter from the first photoreaction body having the first absorption spectrum. A substance that changes to a second photoreactant,
The second wavelength band having a difference between the absorbance of the first absorption spectrum and the absorbance of the second absorption spectrum is a wavelength band different from the first wavelength band,
The stress recording material according to any one of claims 1 to 4, wherein the light blocking member blocks light in the first wavelength band and transmits light in the second wavelength band .

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