Sample for testing dynamic tensile property of titanium alloy subjected to adiabatic shearing

Abstract

The invention discloses a sample for testing the dynamic tensile property of a titanium alloy subjected to adiabatic shearing. The sample is prepared by the following method which comprises the steps of (1) respectively processing supporting ends at two ends of a sample blank, processing a boss to be impacted and a through hole corresponding to the boss to be impacted on a parallel working section between the two supporting ends, forming shearing supporting columns on two sides of the through hole, and forming a supporting column connecting section between the two shearing supporting columns; (2) placing the sample blank on a Hopkinson pressure bar experimental device for impact compression loading, and forming an adiabatic shear band in the direction of a connecting line of the outer side of the boss to be impacted and the inner side of the shearing supporting column; (3) determining the depth of cracks at the two ends of the adiabatic shear band on the parallel working section; (4) processing the parallel working section through linear cutting equipment till only the adiabatic shear band penetrates through the parallel working section; and (5) grinding the linear cutting surface, and removing reversing marks left by linear cutting.

Description

technical field [0001] The invention relates to a sample used for testing the dynamic tensile performance of a titanium alloy after adiabatic shearing, belonging to the field of material performance testing. Background technique [0002] Titanium alloy has excellent characteristics such as high strength, low density, good corrosion resistance and high temperature resistance, and is an important structural material in the fields of aviation, aerospace, weapons, etc. It is usually subjected to dynamic loads during use, such as during service Impact, explosion, penetration, etc. in these applications require materials to have a certain ability to withstand dynamic loads. A large number of studies have shown that under the action of dynamic loads, titanium alloys usually undergo adiabatic shearing. It is generally believed that when the adiabatic shear band appears in the local position of the material, it indicates that the original bearing capacity of the material will drop s...

AI Technical Summary

Problems solved by technology

The widely used test of the dynamic tensile properties of materials is usually based on the Hopkinson tension rod test device, but only for smooth specimens in the shape of rods or plates

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