CN115031873A - Method for determining assembling stress of bolt fastener connecting structure - Google Patents
Method for determining assembling stress of bolt fastener connecting structure Download PDFInfo
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- CN115031873A CN115031873A CN202210590588.5A CN202210590588A CN115031873A CN 115031873 A CN115031873 A CN 115031873A CN 202210590588 A CN202210590588 A CN 202210590588A CN 115031873 A CN115031873 A CN 115031873A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000002441 X-ray diffraction Methods 0.000 claims description 3
- 230000035807 sensation Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
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- 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
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- 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
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
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- 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
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
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Abstract
The application belongs to the technical field of bolt fastener connecting structure assembling stress determination, and particularly relates to a bolt fastener connecting structure assembling stress determination method, which comprises the following steps: manufacturing test pieces of two connected pieces; connecting the two test pieces by using a bolt fastener; gradually increasing the tightening torque of the bolt fastener, measuring the gap and the strain between the two test pieces, and calculating the assembly stress on the two test pieces according to the strain; constructing an incidence relation between a gap between two test pieces and assembly stress on the gap; and measuring the gap between the two connected pieces, and obtaining the assembling stress on the two connected pieces based on the incidence relation between the gap between the two test pieces and the assembling stress on the test pieces.
Description
Technical Field
The application belongs to the technical field of bolt fastener connecting structure assembling stress determination, and particularly relates to a bolt fastener connecting structure assembling stress determination method.
Background
In the bolt fastener connecting structure, the bolt fastener can generate assembly stress on the connected piece, and due to unavoidable reasons such as machining errors and error accumulation, the bolt fastener generates difference among the assembly stress on the connected piece in a screwing state, and if the assembly stress on the connected piece is greater than a stress corrosion threshold value, the bolt fastener is easy to suffer stress corrosion damage.
In order to avoid the connected piece from being damaged by stress corrosion, the assembly stress on the connected piece needs to be determined, and the assembly stress on the connected piece is currently determined mainly by an engineering calculation method and a detail finite element method, wherein:
the assembly stress on the connected piece is determined by an engineering calculation method, the connected piece is assumed to be an infinite-width plate, the cross section of a gap between the connected pieces is assumed to be a rectangle, the support rigidity of the structure is ignored, and a large deviation exists from the actual condition, so that a large error generally exists in the result;
the assembly stress on the connected piece is determined by a detail finite element method, wherein the problems of geometric nonlinearity, bolt fastener tightening torque, contact setting between the bolt fastener and the connected piece and the like are involved, and accurate results are difficult to obtain.
The present application has been made in view of the above-mentioned technical drawbacks.
It should be noted that the above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and the above background disclosure should not be used for evaluating the novelty and inventive step of the present application without explicit evidence to suggest that the above content is already disclosed at the filing date of the present application.
Disclosure of Invention
It is an object of the present application to provide a method of determining assembly stress of a bolted fastener connection to overcome or mitigate at least one of the technical deficiencies of the known prior art.
The technical scheme of the application is as follows:
a bolt fastener connecting structure assembling stress determining method includes:
manufacturing test pieces of two connected pieces;
connecting the two test pieces by using a bolt fastener;
gradually increasing the tightening torque of the bolt fastener, measuring the gap and the strain between the two test pieces, and calculating the assembly stress on the two test pieces according to the strain;
constructing an incidence relation between a gap between two test pieces and assembly stress on the test pieces;
and measuring the gap between the two connected pieces, and obtaining the assembly stress on the two connected pieces based on the incidence relation between the gap between the two test pieces and the assembly stress on the two test pieces.
According to at least one embodiment of the application, in the bolt fastener connecting structure assembling stress determining method, the two test pieces are equivalent to the two connected pieces in rigidity.
According to at least one embodiment of the present application, in the method for determining the assembling stress of the bolt fastener connecting structure, the measuring of the strain amount between the two test pieces specifically includes:
measuring the strain quantity of the surface of the test piece by using a strain gauge; alternatively, the first and second electrodes may be,
measuring the strain quantity of the surface of the test piece by light sensation; alternatively, the first and second electrodes may be,
the amount of strain inside the test piece was measured by short wavelength X-ray diffraction.
According to at least one embodiment of the present application, in the method for determining the assembling stress of the bolt fastener connecting structure, the calculating the assembling stress on the two test pieces by using the strain amount specifically includes:
F＝ε·E；
wherein the content of the first and second substances,
f is the assembly stress on the two test pieces;
epsilon is the amount of strain on the test piece;
e is the modulus of elasticity of the test piece.
According to at least one embodiment of the present application, in the method for determining assembling stress of a bolt fastener connecting structure, the establishing of the association relationship between the gap between the two test pieces and the assembling stress thereon includes:
fitting the gap between the two test pieces and the assembly stress on the gap to obtain a fitting relation; alternatively, the first and second electrodes may be,
and drawing a curve of the gap between the two test pieces and the assembling stress on the gap to obtain a curve relation.
Drawings
FIG. 1 is a schematic diagram illustrating a method for determining assembly stress of a bolt fastener connecting structure according to an embodiment of the present disclosure;
wherein:
m is the bolt fastener tightening torque;
a is the distance from a monitoring point on the connected piece to the axis of the bolt fastener;
f is the assembly stress of the monitoring point on the connected piece;
P 0 generating a fastening force on the connected member for the bolt fastener;
t is the thickness of the connected piece;
h is a gap between the connecting pieces;
l is the effective width of the connected member.
For a better understanding of the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent actual product dimensions, and the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the technical solutions of the present application will be further clearly and completely described in the following detailed description with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only some of the embodiments of the present application, and are only used for explaining the present application, but not limiting the present application. It should be noted that, for convenience of description, only the parts related to the present application are shown in the drawings, other related parts may refer to general designs, and the embodiments and technical features in the embodiments in the present application may be combined with each other to obtain a new embodiment without conflict.
In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The word "comprising" or "comprises", and the like, when used in this description, is intended to specify the presence of stated elements or items, but not the exclusion of other elements or items.
Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.
The present application is described in further detail below with reference to fig. 1.
The assembly stresses on the two connected pieces are: f ═ Epsilon.E;
wherein the content of the first and second substances,
f is the assembly stress on the two connected pieces;
epsilon is the strain on the connected piece;
and E is the elastic modulus of the connected piece.
The strain on the connected piece and the deformation between the connected pieces have the following relationship:
wherein the content of the first and second substances,
epsilon is the strain on the connected piece;
omega is the deformation of the connected piece, and the fastening force P generated on the connected piece by the bolt fastener 0 Induced by the bolt fastener tightening torque M;
t is the thickness of the connected piece;
a is the distance from a measuring point on the connected piece to the axis of the bolt fastener;
and L is the effective width of the connected piece and is the boundary of the rigidity mutation point on the connected piece.
From the above, it is found that the assembling stress F on the two members to be connected, the fastening force P generated on the members to be connected by the bolt fastener tightening torque M 0 Under the action, the deformation quantity omega of the connected piece is related, and the deformation quantity omega of the connected piece can be represented by the gap H between the connected pieces, namely, the assembling stress F on the connecting piece is related to the gap H between the connected pieces.
Based on the principle, the application provides a method for determining the assembling stress of a bolt fastener connecting structure, which comprises the following steps:
manufacturing test pieces of two connected pieces;
connecting the two test pieces by using a bolt fastener;
gradually increasing the tightening torque of the bolt fastener, measuring the gap and the strain between the two test pieces, and calculating the assembly stress on the two test pieces according to the strain;
constructing an incidence relation between a gap between two test pieces and assembly stress on the gap;
and measuring the gap between the two connected pieces, and obtaining the assembling stress on the two connected pieces based on the incidence relation between the gap between the two test pieces and the assembling stress on the test pieces.
For the method for determining assembling stress of the bolt fastener connecting structure disclosed in the above embodiment, it can be understood by those skilled in the art that the method includes manufacturing two test pieces to be connected, replacing the connected pieces with the test pieces, connecting with the bolt fasteners, measuring the gap and the strain between the two test pieces in the process of gradually increasing the tightening torque of the bolt fasteners, calculating the assembling stress on the two test pieces with the strain, constructing the association relationship between the gap between the two test pieces and the assembling stress thereon, specifically fitting the gap between the two test pieces and the assembling stress thereon to obtain a corresponding fitting curve, and obtaining the assembling stress on the two connected pieces based on the association relationship between the gap between the two test pieces and the assembling stress thereon in the case of measuring the gap between the two connected pieces, has higher accuracy.
In some alternative embodiments, in the method for determining the assembling stress of the bolt fastener connecting structure, the two test pieces are equivalent to the two connected pieces in rigidity, thickness and appearance, and are typical structural pieces including the parts with serious assembling stress on the connected pieces.
In some optional embodiments, in the method for determining the assembling stress of the bolt fastener connecting structure, the measuring of the amount of strain between the two test pieces specifically includes:
measuring the strain quantity of the surface of the test piece by using a strain gauge; alternatively, the first and second electrodes may be,
measuring the strain quantity of the surface of the test piece by light sensation; alternatively, the first and second electrodes may be,
the amount of strain inside the test piece was measured by short wavelength X-ray diffraction.
In some optional embodiments, in the method for determining the assembling stress of the bolt fastener connecting structure, the assembling stress on the two test pieces is calculated by using a strain amount, specifically:
F＝ε·E；
wherein the content of the first and second substances,
f is the assembly stress on the two test pieces;
epsilon is the strain on the test piece;
e is the modulus of elasticity of the test piece.
In some optional embodiments, in the method for determining assembly stress of a bolt fastener connecting structure, the establishing of the association relationship between the gap between the two test pieces and the assembly stress thereon specifically includes:
fitting the gap between the two test pieces and the assembling stress on the test pieces to obtain a fitting relation, and calculating the assembling stress on the two connected pieces through the fitting relation under the condition that the gap between the two connected pieces is measured; alternatively, the first and second electrodes may be,
and drawing a curve of the gap between the two test pieces and the assembling stress on the two test pieces to obtain a curve relation, and checking the assembling stress on the two connected pieces through the curve relation under the condition that the gap between the two connected pieces is measured.
The method for determining the assembling stress of the bolt fastener connecting structure is only applicable to the range of the effective width of the connected piece, and is not applicable any more if the distance a from the measuring point on the connected piece to the axis of the bolt fastener exceeds the effective width of the connected piece.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.
Claims (5)
1. A method of determining assembly stress of a bolt fastener connecting structure, characterized by comprising:
manufacturing test pieces of two connected pieces;
connecting the two test pieces by using a bolt fastener;
gradually increasing the tightening torque of the bolt fastener, measuring the gap and the strain between the two test pieces, and calculating the assembly stress on the two test pieces according to the strain;
constructing an incidence relation between a gap between two test pieces and assembly stress on the gap;
and measuring the gap between the two connected pieces, and obtaining the assembling stress on the two connected pieces based on the incidence relation between the gap between the two test pieces and the assembling stress on the test pieces.
2. The bolt fastener connection structure assembling stress determining method according to claim 1,
the two test pieces were comparable in stiffness to the two connected pieces.
3. The bolt fastener connection structure assembling stress determining method according to claim 1,
the method for measuring the strain between the two test pieces specifically comprises the following steps:
measuring the strain quantity of the surface of the test piece by using a strain gauge; alternatively, the first and second electrodes may be,
measuring the strain quantity of the surface of the test piece by light sensation; alternatively, the first and second electrodes may be,
the amount of strain inside the test piece was measured by short wavelength X-ray diffraction.
4. The bolt fastener connection structure assembling stress determining method according to claim 1,
the assembly stress on the two test pieces is calculated by using the strain amount, and the method specifically comprises the following steps:
F＝ε·E；
wherein, the first and the second end of the pipe are connected with each other,
f is the assembly stress on the two test pieces;
epsilon is the strain on the test piece;
e is the modulus of elasticity of the test piece.
5. The bolt fastener connection structure assembling stress determining method according to claim 1,
the method for establishing the incidence relation between the gap between the two test pieces and the assembly stress on the gap comprises the following steps:
fitting the gap between the two test pieces and the assembly stress on the gap to obtain a fitting relation; alternatively, the first and second electrodes may be,
and drawing a curve of the gap between the two test pieces and the assembling stress on the gap to obtain a curve relation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210590588.5A CN115031873A (en) | 2022-05-26 | 2022-05-26 | Method for determining assembling stress of bolt fastener connecting structure |
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| CN202210590588.5A CN115031873A (en) | 2022-05-26 | 2022-05-26 | Method for determining assembling stress of bolt fastener connecting structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353393A (en) * | 2013-06-17 | 2013-10-16 | 西安建筑科技大学 | Test apparatus, test method and prediction method of bolting junction tangential dynamic characteristic |
| CN205538468U (en) * | 2016-01-22 | 2016-08-31 | 南京工程学院 | Quantitative research fit -up gap is to mechanical experiment device of combined material component influence |
| CN207894546U (en) * | 2018-02-09 | 2018-09-21 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of erection stress measurement testpieces |
| CN109376476A (en) * | 2018-11-28 | 2019-02-22 | 中国航空工业集团公司沈阳飞机设计研究所 | Erection stress engineering calculating method |
| CN110426274A (en) * | 2019-07-20 | 2019-11-08 | 国营芜湖机械厂 | The erection stress corrosion testing apparatus and installation method of plane aluminium alloy wall class formation |
| CN112035960A (en) * | 2020-09-02 | 2020-12-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for verifying influence of assembly stress on fatigue life of structure |
-
2022
- 2022-05-26 CN CN202210590588.5A patent/CN115031873A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353393A (en) * | 2013-06-17 | 2013-10-16 | 西安建筑科技大学 | Test apparatus, test method and prediction method of bolting junction tangential dynamic characteristic |
| CN205538468U (en) * | 2016-01-22 | 2016-08-31 | 南京工程学院 | Quantitative research fit -up gap is to mechanical experiment device of combined material component influence |
| CN207894546U (en) * | 2018-02-09 | 2018-09-21 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of erection stress measurement testpieces |
| CN109376476A (en) * | 2018-11-28 | 2019-02-22 | 中国航空工业集团公司沈阳飞机设计研究所 | Erection stress engineering calculating method |
| CN110426274A (en) * | 2019-07-20 | 2019-11-08 | 国营芜湖机械厂 | The erection stress corrosion testing apparatus and installation method of plane aluminium alloy wall class formation |
| CN112035960A (en) * | 2020-09-02 | 2020-12-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for verifying influence of assembly stress on fatigue life of structure |
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