High-speed loading material dynamic indentation experimental method

Abstract

The invention discloses a high-speed loading material dynamic indentation experimental method which is characterized by comprising the following steps of: firstly, fixedly arranging a cylindrical tested part on the end face of the front end of a circular section compression bar, adhering a strain gauge to the compression bar and electrically connecting the strain gauge and a high dynamic strain indicator; then fixedly arranging a light-triggered speed measurement device in front of the tested part; launching a shot by a shot lunching device and enabling the shot to pass through the light-triggered speed measurement device to impact the tested part; and finally, obtaining a press-in force, a press-in speed and a press-in displacement time history of the tested part by a relation. The high-speed loading material dynamic indentation experimental method has the advantages that by the experimental method, dynamic mechanical properties (such as the press-in force, the press-in speed and the press-in displacement time history) of the tested part in the impact process can be measured, so that the dynamic mechanical properties of a material are more deeply researched; moreover, the method can be suitable for a higher impact speed; the impact speed can reach 100m / s; and meanwhile, the experimental method has high measurement accuracy and adopts a simple data processing method.

Description

technical field [0001] The invention relates to an experimental method for dynamic characteristics of materials, in particular to a dynamic indentation experimental method for materials loaded at high speed. Background technique [0002] The mechanical behavior of engineering materials is obviously affected by its stress state, and under dynamic loading conditions, the mechanical behavior of materials is more related to the loading speed (specifically measured as strain rate). The material hardness test is a simple and effective test method for the mechanical properties of materials widely used in the engineering field, while the instrumented indentation and nano-indentation test technology is a further development of the traditional hardness measurement, which can measure the deformation and hardness of the indentation process. force, but the existing technology is limited to the static performance test of the material. Although there are also experimental techniques using...

AI Technical Summary

Problems solved by technology

The material hardness test is a simple and effective test method for the mechanical properties of materials widely used in the engineering field, while the instrumented indentation and nano-indentation test technology is a further development of the traditional hardness measurement, which can measure the deformation and hardness of the indentation process. force, but existing technology is limited to static performance testing of materials

Although there are also experimental techniques using dynamic indentation such as the common Leeb and Shore hardness testers, they only have formal "dynamic" and cannot really measure the dynamic mechanical properties of materials.

[0003] However, the dynamic indentation test under the condition of high-speed loading basically directly uses the projectile to hit the test object, and then estimates the dynamic mechanical properties of the tested material through the indentation depth after the impact and the initial velocity of the projectile, which cannot be measured. The dynamic mechanical properties of the material during impact

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