Device and method for precise detection of Bauschinger effect in repeated bending of sheet metal

Abstract

The invention relates to an apparatus and method for precisely detecting Bauschinger effect of repeated bending of a metal plate, the apparatus comprises a mechanics loading module and a plate clamping adjustable module fixed at the bottom of the mechanics loading module; the mechanics loading module is fixed and suspended through a testing machine and is vertically arranged, X-direction regulating blocks are symmetrically arranged at left side and right side along X-direction of the mechanics loading module, the front end and rear end of each X-direction regulating block are respectively fixed on the Y-direction regulating blocks, and is capable of respectively being driven by the Y-direction regulating blocks to horizontally slide on a pedestal along the Y-direction back and forth; the operation is easy and has automation function, force and displacement during a loading process can be measured, the coordinate figure, curvature radius and strain value at random point on both surface of the plate during the loading process can be measured, the error of test data is less, and the flexibility requirement of the Bauschinger effect for the plate can be satisfied, so that accurate calibration basis for determining material parameter of Bauschinger effect for the plate can be provided.

Description

Technical field [0001] The invention belongs to the technical field of detecting physical properties and mechanical properties of metal sheets, and specifically belongs to a precision detection device and method for the Bauschinger effect of repeated bending of metal sheets. Background technique [0002] The existing metal plate repeated bending test device is that the inspector clamps a piece of steel plate to be tested by hand, and repeatedly shakes the handle for testing. In this experiment process, only the change of the plate can be visually observed and the experiment cannot be used. Data recording, labor intensive, long testing cycle, and often the sample clamp is not tight. The manual repeated bending test device does not have a pre-tensioning mechanism for sheet metal materials. During the bending process, the sheet metal will be slightly elongated due to the rotation and stretching. When the bending passes through the center, the sheet cannot be closely attached to the ...

AI Technical Summary

Problems solved by technology

[0002] In the existing metal plate repeated bending test device, the inspector clamps a piece of steel plate to be tested by hand, and shakes the handle repeatedly for detection. Data recording, and the labor intensity is high, the detection cycle is long, and the sample clamp is often not tight.

The manual repeated bending test device is not equipped with a pre-tightening mechanism for thin metal materials. During the bending process, the metal sheet will be slightly elongated due to the rotation and stretching. When the bending passes through the center, the thin plate cannot be close to the bending circle Arc, so that the bending radius changes, affecting the test data, resulting in large errors in the test data

In addition, some excellent metal sheet metal Bauschinger effect detection methods are only obtained on the basis of establishing the loaded load and loaded load displacement of the metal sheet. The data is single and the accuracy is not high. The model data has certain differences

Images