Indirect strain rate dynamic tensile load testing method applicable to metal materials

Abstract

The invention discloses an indirect strain rate dynamic tensile load testing method applicable to metal materials. The method comprises steps as follows: Step 1, a test piece is mounted on a high-speed hydraulic servo material tester, wherein strain gauges are pasted in corresponding positions of two sides of a non-test section at the lower part of the test piece; Step 2, a dummy gauge is mounted in the same position, where the strain gauges of the test piece are mounted, of a non-test piece, and the non-test piece and the test piece form a Wheatstone full-bridge circuit; Step 3, a dynamic tensile test is conducted on the test piece; Step 4, parameters of the strain gauges, the Wheatstone full-bridge circuit and the test piece are acquired; Step 5, strain of the non-text section at the lower part of the test piece is acquired; Step 6, the tensile load of the test piece in the dynamic tensile test process is acquired through formula calculation. The method has the advantages that the inertia effect of a static clamping fixture is eliminated and the resonant frequency of a testing system is not coupled into test data.

Description

technical field [0001] The invention relates to the technical field of testing dynamic mechanical properties of materials, in particular to an indirect testing method for strain rate dynamic tensile load applicable to metal materials. Background technique [0002] The mechanical properties of materials are an important performance of engineering materials. Many material properties are very sensitive to strain rate. When the structure is subjected to impact loads such as bird strikes and crashes, the mechanical properties of materials are obviously different from static and quasi-static loading conditions. , therefore, in the impact analysis and design of the structure, the dynamic mechanical performance data of the material is required as the basic input condition. [0003] In different strain rate ranges, the main factors that determine the mechanical properties of materials are often different, which requires different methods for different strain rate ranges to obtain the...

AI Technical Summary

Problems solved by technology

Therefore, in the case of high-speed tension, the dynamic tensile load data of the load sensor test is inaccurate, and it is necessary to explore a new dynamic tensile load test method to meet the tensile load test in the dynamic tensile test of metal materials.

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