Experimental device for steel plate Bauschinger effect coefficient measurement

Abstract

The invention relates to an experimental device for steel plate Bauschinger effect coefficient measurement and belongs to the technical field of a material performance test. According to the test, an average value of ratios of compressive yield strength values of a material to corresponding tensile yield strength values is used as a Bauschinger effect coefficient of the materials. In compressive yield strength measurement, when a common sample clamping device is used, a sample can produce untimely unstable buckling in compression and influence caused by factors such as friction can be produced because a metal clamp head directly press tightly sides of the sample. Aiming at solving the above problem, the invention designs the novel experimental device for steel plate Bauschinger effect coefficient measurement. Two sides of a sample 10 are pasted with plastic side pads, then the sample 10 is tightly clamped by tapered pressing blocks 6 acting on two sides of the sample 10 so that unstable buckling of the sample under the pressure is effectively limited, and the plastic side pads have good lubricity so that the influence produced by a frictional force on sample compression deformation is substantially reduced; a tapered ring 7 and the tapered pressing blocks 6 can tightly and reliably clamp the sample by tapered surfaces; and upper and lower surfaces of a pressing block 1 have a high parallel degree and the pressing block 1 and a main cylinder 2 have a high guide precision so that sample axial-compression can be ensured. The experimental device improves the accuracy of compressive yield strength measurement.

Description

Technical field: [0001] The invention relates to an experimental device for measuring the Bauschinger effect coefficient of a steel plate, belonging to the technical field of material performance testing. Background technique: [0002] The Bauschinger effect is an inherent characteristic of metals, which manifests itself as a phenomenon in which the yield stress of materials decreases with different loading directions. For example, when a stainless steel plate is stretched, a tensile yield strength value will be obtained, and then compressed in the opposite direction, a compressive yield strength will be obtained, but the compressive yield strength will be smaller than the tensile yield strength. This phenomenon is called the Bauschinger effect , usually the ratio of the yield strength after compression to the tensile yield strength is called the Bauschinger effect coefficient. [0003] Stretch-bending forming technology of sheets or profiles is greatly affected by the Baus...

AI Technical Summary

Problems solved by technology

[0005] In the measurement of compressive yield strength, it is required that the sample only undergoes axial compression deformation and cannot produce bending deformation. When using ordinary sample clamping devices, the specimen will produce premature buckling during compression, and the metal clamp The influence of factors such as friction caused by direct compression of the test head on the side of the sample will limit the compression deformation of the sample, which will affect the accuracy of the measurement of the compressive yield strength

[0006] In view of the above problems, the present invention proposes an experimental device for measuring the Bauschinger effect coefficient of a steel plate, which skillfully solves the problems of premature buckling when the sample is compressed and the friction of the metal chuck to limit the compression deformation of the sample, etc. Improving the Accuracy of Compressive Yield Strength Measurements

Images