Device and method for testing stress-strain curve of titanium alloy material under high temperature and high strain rate

Abstract

The invention belongs to the field of material mechanical property testing, and discloses a titanium alloy material stress-strain curve testing device and method under high temperature and high strainrate. The testing device comprises an energy module, a force application module, a deformation module, a measurement module and a processing module, wherein the energy module is used for providing afirst pulse current and a second pulse current; the force application module is used for generating pulse electromagnetic force; the deformation module is used for preheating the to-be-measured titanium alloy sample to reach a target temperature after the first pulse current is introduced, and enabling the to-be-measured titanium alloy sample to generate high-speed tensile deformation under the action of the pulse electromagnetic force; the measurement module is used for collecting strain and speed data and temperature data; and the processing module is used for obtaining a stress-strain curveof the titanium alloy material at high temperature and high strain rate according to the strain and speed data and the temperature data. Real temperature, strain rate, strain and stress data can be directly obtained, and the test accuracy is very high.

Description

technical field [0001] The invention belongs to the field of testing mechanical properties of materials, and more specifically relates to a device and method for testing stress-strain curves of titanium alloy materials under high temperature and high strain rate. Background technique [0002] Titanium and its alloys have many advantages, such as low density, low elastic modulus, high specific strength, corrosion resistance and high temperature resistance. Key basic materials in the field of science and technology. "Made in China 2025" and other documents all propose to vigorously promote breakthroughs in the fields of aerospace, marine engineering and other high-end equipment, so there is a huge demand for titanium alloy materials. [0003] Titanium alloy has high strength, low elongation, and difficult forming. In the industry, hot forming technology is often used to process titanium alloy parts. At present, some scholars use electromagnetic forming technology and electrom...

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Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide a method for testing the stress-strain curve of titanium alloy materials under high temperature and high strain rate, aiming to solve the problems of low accuracy of the simulation prediction method existing in the existing testing technology and the difficulty of the experimental testing method. The problem of not being able to measure at both high temperature and high strain rate at the same time

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