CN-122016527-A - Method for rapidly evaluating fatigue performance of plate forming part

CN122016527ACN 122016527 ACN122016527 ACN 122016527ACN-122016527-A

Abstract

The invention discloses a method for rapidly evaluating fatigue performance of a plate forming part, which comprises the steps of acquiring deformation of a part key position by means of a grid strain analysis system, simulating the deformation mode and the deformation of the part key position by bulging, processing a fatigue sample on a simulated bulging test piece, and testing the fatigue performance of the fatigue sample. The method has the advantages that the fatigue performance of parts which are processed in different modes such as stamping, rolling and the like, are made of different materials and have different shapes can be evaluated simply and quickly without additional tools and fixtures, the method can be used for evaluating the parts which are obtained by the plate material after deformation, whether the parts are subjected to stamping deformation or rolling deformation and the characteristics of the parts are complex, the application range is wide, the method is suitable for testing the fatigue performance of the parts which are processed and deformed in various modes such as stamping, rolling and the like, the test period is short, the constraint of the parts materials, the surface quality, the shape, the size and the like is avoided, and the method has the characteristics of simplicity, convenience, low cost, high precision and simplicity and convenience in operation.

Inventors

ZHANG QIAN
XIA MINGSHENG
ZHAO GUANG
SUN ZHIQIANG
LIU LIXUE
LI YANJIE
LIU SHUYING
LV HAO
Zhang Saijuan

Assignees

唐山钢铁集团有限责任公司
河钢乐亭钢铁有限公司
河钢股份有限公司唐山分公司

Dates

Publication Date: 20260512
Application Date: 20260225

Claims (3)

1. A method for rapidly evaluating fatigue performance of a plate formed part is characterized in that deformation of a part key position is obtained by means of a grid strain analysis system, bulging simulates the deformation mode and the deformation of the part key position, a fatigue sample is processed on a simulated bulging test piece, and fatigue performance test is conducted on the fatigue sample.
2. The method for rapidly evaluating the fatigue performance of the plate forming part according to claim 1, comprising the steps of (1) selecting the part to be evaluated, printing grids on an original plate before deformation, and placing the original plate into a die to deform the original plate into a target part under stress; (2) Analyzing and testing the target part by means of a grid strain analysis system to obtain a strain mode and a primary and secondary strain value of a key position area of the target part; (3) Taking an bulging material sheet, performing bulging test by adopting a flat-head male die, and analyzing strain of a deformation plane area of a test piece; (4) The strain mode and the strain quantity of the test piece are adjusted by adjusting the width and the bulging height of the bulging material piece until the strain mode is consistent with the deformation mode of the key position of the target part, and the width w and the bulging height value h of the test piece are recorded; (5) Carrying out an h-height flat-head bulging test on a sample with the width w to obtain a bulging test piece; (6) And (3) performing high-cycle fatigue or low-cycle fatigue test on the fatigue test sample according to the service working condition of the part to obtain fatigue performance, namely the predicted fatigue property of the part.
3. The method for rapidly evaluating fatigue property of a plate molding part according to claim 2, wherein in the step (1), the mesh is printed on the plate material before deformation by an electrochemical corrosion method.

Description

Method for rapidly evaluating fatigue performance of plate forming part Technical Field The invention relates to the technical field of plate forming performance evaluation, in particular to a method for rapidly evaluating fatigue performance of a plate forming part. Background Fatigue failure is a major cause of mechanical part failure, and it has been shown that 70% of failures in automotive parts are caused by fatigue. Fatigue cracks are often created at stress concentrations that, if not evaluated in advance, can lead to sudden breaks, resulting in equipment failure and even catastrophic failure. Through fatigue performance evaluation, endurance limits of the part under cyclic load can be quantified, thereby avoiding risks in design. However, the fatigue performance is evaluated at the board layer at present, in the actual production process, the board is carried out bearing service after being deformed into a part through a series of deformation, the material performance is changed due to the fact that the work hardening or hole defects are generated in the deformation process, and the fatigue performance is also changed, so that the fatigue performance of the board cannot be effectively represented as the fatigue property of the part. If the fatigue performance of the part is required to be accurately obtained, the work load is required to be applied to the part, no specific clamp cannot be completed, the sizes and the characteristics of the parts are different, the clamps cannot be shared, the cost for manufacturing the clamp for each test part in a laboratory is too high, and the feasibility is not great. Therefore, a method for quickly evaluating the fatigue performance of parts for a laboratory is needed to be constructed simply and conveniently. Disclosure of Invention The invention aims to provide a simple, convenient and fast method for evaluating the fatigue performance of a plate forming part. In order to solve the technical problems, the method adopts the technical scheme that deformation of a critical position of a part is obtained by means of a grid strain analysis system, the bulging simulates the deformation mode and the deformation of the critical position of the part, a fatigue test sample is processed on the simulated bulging test piece, and fatigue performance test is carried out on the fatigue test sample. Selecting a part to be evaluated, printing grids on an original plate before deformation, and placing the original plate into a die to deform the original plate into a target part under stress; (2) Analyzing and testing the target part by means of a grid strain analysis system to obtain a strain mode and a primary and secondary strain value of a key position area of the target part; (3) Taking an bulging material sheet, performing bulging test by adopting a flat-head male die, and analyzing strain of a deformation plane area of a test piece; (4) The strain mode and the strain quantity of the test piece are adjusted by adjusting the width and the bulging height of the bulging material piece until the strain mode is consistent with the deformation mode of the key position of the target part, and the width w and the bulging height value h of the test piece are recorded; (5) Carrying out an h-height flat-head bulging test on a sample with the width w to obtain a bulging test piece; (6) And (3) performing high-cycle fatigue or low-cycle fatigue test on the fatigue test sample according to the service working condition of the part to obtain fatigue performance, namely the predicted fatigue property of the part. Further, in the step (1), a grid is printed on the plate material before deformation by adopting an electrochemical corrosion method. The method has the advantages that the fatigue performance of parts processed in different modes such as stamping, rolling and the like, different materials and different shapes can be evaluated simply and quickly without additional tools and fixtures, the method can be used for evaluating the parts obtained by the plate after deformation, whether the parts are obtained by stamping deformation or rolling deformation, and the characteristics of the parts are complex, the application range is wide, the method is suitable for testing the fatigue performance of the parts processed and deformed in various modes such as stamping, rolling and the like, the test period is short, the method is not constrained by the materials, the surface quality, the shape, the size and the like of the parts, and the method has the characteristics of simplicity, convenience, low cost, high precision and simplicity and convenience in operation. Drawings The invention will be described in further detail with reference to the drawings and the detailed description. FIG. 1 is a schematic flow diagram of the method of the present invention; FIG. 2 is an original sheet view of a target part of a printed grid according to example 1 of the present invention; FIG. 3 is a diagram of