CN109000837A - A kind of hot-press solidifying composite product and mold interface stress monitoring method - Google Patents
A kind of hot-press solidifying composite product and mold interface stress monitoring method Download PDFInfo
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- CN109000837A CN109000837A CN201810437824.3A CN201810437824A CN109000837A CN 109000837 A CN109000837 A CN 109000837A CN 201810437824 A CN201810437824 A CN 201810437824A CN 109000837 A CN109000837 A CN 109000837A
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- thin slice
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/002—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- General Physics & Mathematics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of hot-press solidifying composite product and mold interface stress monitoring method, the monitoring method includes being monitored using a kind of interfacial stress monitoring system, the system comprises composite material support plates, the composite product of pending hot-press solidifying processing on the supporting plate is set, data acquisition thin slice above composite product is set and is fixed at the foil gauge of data acquisition thin slice upper surface, data acquisition thin slice with a thickness of 0.4mm or less, identical as the peripheral size size of the composite product or both the peripheral size difference of the peripheral size size of data acquisition thin slice is no more than ± 0.5mm；After using the system detection to strain data, which is multiplied with the elasticity modulus data of data acquisition thin slice material therefor and obtains the interfacial stress of the composite product and mold.The present invention can go out shear stress on interface with the strain calculation measured by the elasticity modulus of mold materials, have operability.
Description
Technical field
The present invention relates to hot-press solidifyings to prepare field of compound material, and in particular to prepared by a kind of hot-press solidifying composite material
Composite product and mold interface Stress On-Line method in journey.
Background technique
Polymer matrix composites are widely used with its excellent performance in fields such as aerospace, automobile ships.
Autoclave forming process (hot-press solidifying preparation) is widely used in the molding manufacture of polymer matrix composites.But composite wood
Material product deforms seriously after demoulding, influences its formed precision, influences the factor that product is deformed and be broadly divided into: uneven
Residual stress caused by the thermal expansion coefficient difference and mold and product of cure shrinkage, resin and carbon fiber interact causes
Product is deformed, and wherein the last one factor is especially worth drawing attention.Entirely solidifying however, being directed to outside Current Domestic
The research of mold and product interface interaction is less in the process.There is report to detect stress using Fiber Optic Sensor, and is specifically solid in hot pressing
Change in composite material preparation process and buries optical fiber to composite product and mold interface.Such as patent application
A kind of spacecraft composite structure ag(e)ing process internal stress monitoring method is provided in 201611117838.4, and patent
CN201611146925.2 application provides a kind of fibrous composite hot moulding curing deformation optical fiber monitoring device and method.But light
Nanofarads are difficult online detecting/monitoring to stress data.In addition, also there is the report using foil gauge monitor stress data, foil gauge be by
The compositions such as sensitive grid are used to measure the element of strain.The working principle of resistance strain gage is made based on strain effect, that is, is led
When body or semiconductor material generate mechanically deform under the action of external force, resistance value accordingly changes, and this phenomenon claims
For " strain effect ".If patent application CN201610128916.4 provides a kind of monitoring composite material in the curing process,
With the method for mold interaction force.In the invention, in the die surface distribution setting multiple tracks groove of composite material contact, strain
Sensor is embedded in groove, and sensor measurement region both ends are fixed with mold.The strain signal that sensor is measured is scaled multiple
Stress value between condensation material and mold realizes the monitoring of interaction force between solidification process composite material and mold.The hair
The bright effective monitoring for realizing the interaction force in solidification process between composite material and mold is composite material curing deformation
Prediction and control provide technical support.The strain transducer in this method be fiber-optic grating sensor, metal strain plate or
Other type strain transducers.But at least there is following deficiency in this method:
1) encapsulation process need to be done to groove after being embedded to sensor by referring in this method, can thus change mold and compound
The interface contact state of material influences the authenticity of interfacial stress measurement；
2) stress state on mold at open channels may be not identical as other places, therefore this method may will affect
The authenticity of Surface stress measure；
3) larger for the mold fluting difficulty of certain materials, operation difficulty is big, such as mold is polymer matrix composites
Material is difficult to remove fiber in slot when processing tiny groove in the method, this can further influence interfacial stress and survey
The authenticity of examination；
If 4) use optical fiber as sensor in this method, bends, measurement can be caused when optical fiber is drawn groove
Tremendous influence.
Therefore, can the above method has the resulting data of measurement really reflect that interface is answered between mold and composite product
The problem of power, while this method operability is poor.Thus this field is multiple there is still a need for a kind of new hot-press solidifying resin base is developed
Composite product and mold interface stress monitoring system and method in condensation material preparation process, accurately to study the interfacial stress
And then prevent composite product severely deformed after demoulding.
Summary of the invention
Therefore, present invention firstly provides a kind of hot-press solidifying composite product and mold interface stress monitoring method, institutes
Stating monitoring method includes being monitored using a kind of interfacial stress monitoring system, the system comprises composite material support plate, is set
Set the composite product of pending hot-press solidifying processing, the data acquisition being arranged in above composite product on the supporting plate
Thin slice and the foil gauge for being fixed at data acquisition thin slice upper surface, data acquisition thin slice with a thickness of 0.4mm with
Under, it is all that the peripheral size size of data acquisition thin slice is identical as the peripheral size size of the composite product or both
Side size difference is no more than ± 0.5mm；After using the system detection to strain data, which is adopted with data
The elasticity modulus data of collection thin slice material therefor, which are multiplied, obtains the interfacial stress of the composite product and mold.
In a kind of specific embodiment, the material of the data acquisition thin slice is multiple with usual hot-press solidifying resin base
The material of the molding die of condensation material is consistent, and the material of preferably data acquisition thin slice is aluminium, steel or the resin base after solidifying
One of composite material.
In the forming process of polymer matrix composites hot-press solidifying, used mold acquires thin slice with respect to the data
For its thickness be very thick.
In a kind of specific embodiment, the material of the composite material support plate and the composite product solidify
Material afterwards is identical, and support plate is smooth, roughness Ra≤1.6 μm, and plate surface is supported to be coated with release agent or release cloth.
So set, to guarantee that support plate and a cured product have the same or similar thermal expansion coefficient.The support plate is this hair
Necessary parts in bright system, the effect of the support plate are to keep not bending in product solidification process within the system.And
When producing composite product using thick molding die vacuum hotpressing, do not need using the support plate, because producing
In the process, the size of product to be formed is less than the die size for supporting product, and die size is greater than the remaining of product size
Amount part can play the role of support plate 11 in the present invention.
In a kind of specific embodiment, the strain acquirement device strained in the system comprising on-line measurement is described
Strain acquirement device includes the foil gauge and sequentially connected foil gauge conducting wire, dynamic strain Acquisition Instrument, connecting line and answers
Become acquisition display.In the present invention, including foil gauge, foil gauge conducting wire, dynamic strain Acquisition Instrument, connecting line and strain acquirement are aobvious
Show that the strain acquirement device of device all can be by commercially available acquisition.The dynamic strain Acquisition Instrument is for example dynamic using DS-NET
State data collecting instrument.
It further include autoclave in the system in a kind of specific embodiment, it is the composite material support plate, compound
Material, data acquisition thin slice and the foil gauge are arranged in the autoclave.
It further include the thermocouple being arranged in autoclave, the heat in the system in a kind of specific embodiment
Galvanic couple is arranged in above data acquisition thin slice and position that is close or being close to the foil gauge.
In a kind of specific embodiment, the foil gauge is pasted and fixed on data acquisition thin slice using high-temperature plastic
On.
In the present invention, the foil gauge is pasted on data acquisition thin slice 10 using high-temperature plastic, and the high-temperature plastic can
To need to be resistant to the temperature of hot-press solidifying composite material in autoclave by commercially available acquisition.Foil gauge is by high molecular material
It is made, thus cannot be welded on data acquisition thin slice, in addition to pasting and fixing, can also take other form and fix the two,
Such as bayonet type, but more preferably use adhesive means.
In a kind of specific embodiment, the peripheral size size and the composite material system of the data acquisition thin slice
The peripheral size difference in size of part is no more than ± 0.2mm.
In a kind of specific embodiment, data acquisition thin slice 10 with a thickness of 0.3mm or less.
In a kind of specific embodiment, the setting composite material that pending hot-press solidifying is handled on the supporting plate
Product with a thickness of 0.5mm or more, the preferably described product with a thickness of 0.7~2mm.
The present invention correspondingly provides a kind of hot-press solidifying composite product and mold interface stress monitoring system, the system
System includes composite material support plate, the setting composite product that pending hot-press solidifying is handled on the supporting plate, setting multiple
Data above condensation material product acquire thin slice and are fixed at the foil gauge of data acquisition thin slice upper surface, the data
Acquire thin slice with a thickness of 0.4mm hereinafter, the peripheral size size of data acquisition thin slice and the composite product
Identical or both the peripheral size difference of peripheral size size is no more than ± 0.5mm.
In the present invention, the hot-press solidifying composite material is polymer matrix composites, is specifically, for example, resin and carbon fiber
Composite material or resin and glass fiber compound material etc..After the mold is, for example, aluminum die, steel mold or curing molding
Polymer matrix composites mold.In the present invention, the foil gauge is obtained by purchase, foil gauge used in the embodiment of the present invention
For resistance to 180 DEG C of medium temperature foil gauge.In the present invention, foil gauge conducting wire is also mating purchase, it can equally be resistant to 180 DEG C and
Above temperature.
It is located above if during normal hot-press solidifying prepares polymer matrix composites be folded in foil gauge
Between product and underlying mold (mold thickness is generally 8~20mm), because needing in product solidification process by viscosity flow
The states such as state, gel state and glassy state, at this moment foil gauge will test during this complicated physical and chemical changes less than
Data.Therefore, those skilled in the art's strain measurement hot-press solidifying generally difficult to use prepares polymer matrix composites
Stress between mold and interface in the process.And in the present invention, system is measured indirectly using the data acquisition thin slice 10 of thickness very little
The strain to interact between part and mold.
Multiple material product-mold interface stress test system is constructed based on dynamic balance and equivalence principle, obtains and solidified
Journey answers material product and mold interaction interface strain variation rule.This method is based on following two assumed condition: 1) assuming aluminium
Piece (data acquisition thin slice) is not bent in entire solidification process.2) stress gradient is not present on the thickness direction of aluminium flake.
In fact, in the system of the present invention, for the 1) point, because aluminium flake and product are fitted tightly over composite wood under hyperbaric environment
Expect in support plate, is not in buckling phenomenon；It is therefore assumed that setting up.For the 2) point, because the thickness of aluminium flake is very small, in aluminium
Stress gradient is not present in piece thickness direction, i.e. the upper and lower surface stress or stress state of aluminium flake are consistent, therefore the hypothesis
It sets up.
Skilled person will appreciate that, to avoid composite product from being bent after curing molding, need to know solidification
Interfacial stress between mold for forming and product, stress=strain × elasticity modulus, and the only strain data that can be measured, this
The elasticity modulus of data acquisition thin slice (aluminium flake) can be used in invention, it is a constant, so as to smoothly acquire interface
Stress data.And if foil gauge is directly attached to composite product and mold interface is gone to survey and be strained, in such conventional method
In, then need to measure the elasticity modulus of composite product, because of state in the complexity and forming process of composite material compositions
Complexity, which is difficult to measure by research technique, therefore even if foil gauge is directly attached to product and mold
Interface measure strain value after, it is also difficult to get the data of interfacial stress.
The present invention at least has the following beneficial effects:
1, the present invention dexterously monitors mold using rigidly connected foil gauge and data acquisition thin slice and other components
Interaction between composite product will be difficult to the mold measured originally -- and the interaction force between product becomes to hold
Easily measurement.
2, the system and method do not need the physical parameters such as the elasticity modulus of measurement composite material, can be by mold materials (i.e.
Data acquire thin slice material therefor, such as aluminium) the parameters such as elasticity modulus calculate shear stress on interface, there is operability.
3, the system and method are suitable under the mold (such as composite material of aluminium, steel or forming) of all materials
To mold -- product interaction is monitored.
4, the present invention realizes mold -- the real-time monitoring of product interface interaction strain, to analyse in depth large-scale composite material
Component curing deformation provides theoretical foundation.
Detailed description of the invention
Fig. 1 is the depression angle structural schematic diagram of system of the present invention.
Fig. 2 is the main view angle structural schematic diagram of components of system as directed structure of the present invention.
Fig. 3 is to use systematic survey mold of the present invention -- the strain result to interact between composite product
Figure.
In figure, 1- autoclave, 2- thermocouple, 3- autoclave preformed hole, 4- temperature sensor, 5- strain acquirement display,
6- connecting line, 7- dynamic strain Acquisition Instrument, 8- foil gauge conducting wire, 9- foil gauge, 10- data acquire thin slice, 11- composite material branch
Fagging, 12- composite product.
Specific embodiment
As depicted in figs. 1 and 2, the present invention provides a kind of hot-press solidifying composite product and mold interface stress monitoring system
System, the system comprises composite material support plates 11, the setting composite material system that pending hot-press solidifying is handled on the supporting plate
Part 12, the data being arranged in above composite product acquire thin slice 10 (aluminium flake) and are fixed on data acquisition thin slice
The foil gauge 9 on surface, data acquisition thin slice 10 with a thickness of 0.4mm hereinafter, the peripheral size of data acquisition thin slice
Identical as the peripheral size size of the composite product or both the peripheral size difference of size is no more than ± 0.5mm.
The present invention also provides a kind of hot-press solidifying composite product and mold interface stress monitoring method, the monitoring sides
Method includes being monitored using a kind of interfacial stress monitoring system, and the system structure is as described above；It is examined using the system
After measuring strain data, the elasticity modulus data of the strain data and data acquisition thin slice material therefor are multiplied described in obtaining
The interfacial stress of composite product and mold.
In the present invention, for the setting of product 12 below data acquisition thin slice 10, data acquisition thin slice 10 is arranged in foil gauge
Top, acquiring between above and below thin slice 10 in data does not have stress gradient.The setting of thermocouple 2 acquires thin slice 10 in data
Top, for detecting the temperature near foil gauge 9.In the present invention, data acquire the in the same size of thin slice 10 and product 12 or
Close, if data acquisition thin slice 10 is significantly less than product, in product viscous state, the high pressure in autoclave can be easy count
It is pressed into product according to acquisition thin slice 10.If data acquire thin slice 10 and are significantly greater than product, data acquire thin slice 10 in hot pressing
It can bend under condition of high voltage in tank, so that curved and intermediate under its surrounding arch upward, so that the stress data detected
It is inaccurate.Therefore, both of which can not accurate response interface actual strain situation.On-line monitoring system of the invention
In, it is ensured that product and data acquisition thin slice 10 will not all bend in measurement process.Data acquisition thin slice 10 can be with
It is plain film or the curved tabs with radian, is in fact had mostly centainly in the polymer matrix composites product product of hot-press solidifying
Radian, the present invention in first pursue fundamental studies, first by data acquisition thin slice 10 be set as plate, first study plate interfacial stress feelings
Condition, it is subsequent to study other complex configuration structures again.It can guarantee using on-line monitoring system of the present invention: 1) data acquisition thin slice
10 are not bent during entirely test product is cured, and the value that foil gauge is measured reflects always true value.2) data
The stress up and down for acquiring thin slice 10 is consistent, and the mold and product interfacial stress data that guarantee foil gauge measures indirectly are accurate.
In a particular embodiment, the length of foil gauge is 5mm, width 3mm, with a thickness of 0.2~0.3mm, test product
12 and data acquisition thin slice 10 be long 200mm, wide 50mm, data acquire thin slice 10 with a thickness of 0.25mm, test the thickness of product
Degree is 1mm or so.The shape and size of the test product used in the visible present invention of foregoing description and the hot pressing usually prepared
The shape and size for solidifying composite product product are not identical.
Use mold during system thinking polymer matrix composites curing molding of the present invention -- product interaction
Strain measurement result it is as shown in Figure 3.
In the present invention, vacuumizing is the cured necessary condition of product.The unit of right side ordinate strain value is 10 in Fig. 3-6,
Its value is that positive number indicates stretching strain, and value is negative number representation compressive strain.It is divided into I, II, III, IV and V this five by strain in figure
Stage.
In stage i, softens in uncured glassy state (i.e. likeness in form plasticine state) product temperature-rise period, adopted with data
It is close to collect thin slice 10 (aluminium flake) fitting, temperature increase data acquisition thin slice 10 can also expand, and can also be in close contact to product, but shadow
It rings little.It is stretching strain in stage i, illustrates that the expansion of data acquisition thin slice (aluminium flake) is greater than the expansion of product.
In phase il, product is viscous state (likeness in form is liquid), and data acquire the influence of thin slice (aluminium flake) to product
Smaller, strain goes to zero.
In the Section III stage, initial phase strain regime changes greatly.In the Section III stage, composite product is by gel state
To rubber transition, data acquire tight bond between thin slice and composite product.
In the IVth stage, declining with temperature, data, which acquire, generates adhesion shearing force between thin slice and composite product,
Strain variation state is maximum；
It in the Vth stage, is slided between data acquisition thin slice and composite product, there are definite values to slide shearing force, answers
Become substantially constant.
The above content is combine specific preferred embodiment to the further description of the invention made, and it cannot be said that originally
The specific implementation of invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, not
Under the premise of being detached from present inventive concept, several simple deductions and replacement can also be made, all shall be regarded as belonging to guarantor of the invention
Protect range.
Claims (10)
1. a kind of hot-press solidifying composite product and mold interface stress monitoring method, which is characterized in that the monitoring method
Including using a kind of interfacial stress monitoring system to be monitored, the system comprises composite material support plate (11), settings to prop up
The composite product (12) of pending hot-press solidifying processing, the data acquisition being arranged in above composite product are thin on fagging
Piece (10) and the foil gauge (9) for being fixed at data acquisition thin slice upper surface, the thickness of data acquisition thin slice (10)
For 0.4mm hereinafter, the peripheral size size and the peripheral size size phase of the composite product of data acquisition thin slice
Same or both peripheral size difference is no more than ± 0.5mm；After using the system detection to strain data, by the dependent variable
The interface of the composite product and mold is obtained according to being multiplied with the elasticity modulus data of data acquisition thin slice material therefor
Stress.
2. the method according to claim 1, wherein the material of data acquisition thin slice is solid with usual hot pressing
The material for changing the molding die of polymer matrix composites is consistent, and the material of the preferably described data acquisition thin slice is aluminium, steel or solidification
One of polymer matrix composites afterwards.
3. the method according to claim 1, wherein the material of the composite material support plate and the composite wood
Material after material product solidifies is identical, and support plate is smooth, roughness Ra≤1.6 μm, and plate surface is supported to be coated with demoulding
Agent or release cloth.
4. the method according to claim 1, wherein the strain acquirement comprising on-line measurement strain in the system
Device, the strain acquirement device include that the foil gauge (9) and sequentially connected foil gauge conducting wire (8), dynamic strain are adopted
Collect instrument (7), connecting line (6) and strain acquirement display (5).
5. the method according to claim 1, wherein further include autoclave in the system, the composite material
Support plate (11), composite product (12), data acquisition thin slice (10) and the foil gauge (9) are arranged at the hot pressing
In tank.
6. according to the method described in claim 5, it is characterized in that, further including the thermoelectricity being arranged in autoclave in the system
Even (2), the thermocouple is arranged in above data acquisition thin slice and position that is close or being close to the foil gauge.
7. the method according to claim 1, wherein the foil gauge is pasted and fixed on data using high-temperature plastic
It acquires on thin slice.
8. the method according to claim 1, wherein the data acquisition thin slice peripheral size size with it is described
The peripheral size difference in size of composite product is no more than ± 0.2mm.
9. the method according to claim 1, wherein the data acquisition thin slice (10) with a thickness of 0.3mm with
Under.
10. method described according to claim 1~any one of 9, which is characterized in that pending heat on the supporting plate is arranged
The composite product of cured processing with a thickness of 0.5mm or more, the preferably described product with a thickness of 0.7~2mm.
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| CN201810437824.3A CN109000837B (en) | 2018-05-09 | 2018-05-09 | Method for monitoring interface stress between hot-press curing composite material part and mould |
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| CN201810437824.3A CN109000837B (en) | 2018-05-09 | 2018-05-09 | Method for monitoring interface stress between hot-press curing composite material part and mould |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088026A (en) * | 2022-01-20 | 2022-02-25 | 江苏奥琳斯邦装备科技股份有限公司 | Hot-pressing curing device and curing method for strain measurement |
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