Method for testing large deformation impact tension of material

Abstract

The invention discloses a method for testing large deformation impact tension of a material. The method is characterized in that a supporting block is arranged at the upper end of a bracket; a tubulartransmission bar is vertically arranged, and the upper end of the transmission bar is fixedly connected to the supporting block; tubular incident bar which is the same as the transmission bar in theaspects of material, length and diameter is selected and vertically coaxially arranged below the transmission bar; a boss is integrally arranged at the lower end of the incident bar; a tested part isfixed between the lower end of the transmission bar and the upper end of the incident bar; an impact rod is launched to impact the boss which is fixed at the lower end of the incident bar, thus a strain signal can be tested; and the tested signal is substituted into a relation to obtain an axial engineering stress, engineering strain and engineering strain rate time history curve of the tested part in the test. The method has the advantage that the continuous stable test strain rate is achieved; and in addition, the strain rate is up to 10S<-1> order under the maximum stress the same as that of a traditional Hopkinson bar test.

Description

technical field [0001] The invention relates to an experimental method for testing the dynamic performance of materials, in particular to a large deformation impact tensile test method for materials. Background technique [0002] The determination of the mechanical response characteristics and failure conditions of engineering materials under dynamic loading conditions is one of the most basic prerequisites for engineering design, engineering simulation and analysis. It is usually described by the material constitutive equation and corresponding parameters and material failure conditions, and needs to be determined through material dynamic loading experiments. [0003] The separated Hopkinson tie rod is the most widely used and considered reliable and effective experimental device for testing the tensile mechanical properties of materials at high strain rates. It can be used to test various engineering materials at 10 2 ~10 3 S -1 The dynamic stress-strain curve and the f...

AI Technical Summary

Problems solved by technology

However, the traditional Hopkinson tie rod can only achieve a larger experimental strain at a higher strain rate when the total length of the device is limited, while at 100S -1 Large enough experimental strains are usually not achieved at strain rates of the order that the failure strain of the material cannot be measured

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