System and method for testing dynamic performance of material in complex stress state

Abstract

The invention discloses a system and method for testing the dynamic performance of a material in a complex stress state, and belongs to the technical field of dynamic mechanical performance testing. The system comprises a control circuit system, a loading system and a signal acquisition system. Based on an electromagnetic loading technology, the control circuit system realizes charging and discharging control of the loading system; the loading system loads a material; and the signal acquisition system acquires strain and time characteristics of the material in the loading process; the control circuit system utilizes the same discharge silicon controlled rectifier to perform discharge on four discharge coils at the same time, thereby realizing biaxial bidirectional synchronous loading; according to the dependency relationship between the electromagnetic force peak value of the branch discharge coils and branch equivalent resistance, the loading system utilizes the branch equivalent resistance to compensate the electromagnetic force peak value, it is guaranteed that the electromagnetic loading force peak values of the four discharge coils are the same, and biaxial bidirectional equivalent loading is achieved. In addition, through reasonable structural design and circuit design, loading tests of biaxial bidirectional Hopkinson pressure bar and pull bar experiments are unified, the test range is expanded, and the equipment size is reduced.

Description

technical field [0001] The invention belongs to the technical field of dynamic mechanical performance testing, in particular to a system and method for testing dynamic performance of materials under complex stress states. Background technique [0002] In the fields of aerospace and weapons, materials are often subjected to dynamic loads such as impact and explosion. The measurement of the dynamic mechanical properties of materials is very important for the optimal design of structural impact resistance and explosion resistance. The Hopkinson rod is an effective means to measure the dynamic mechanical properties of materials, usually including Hopkinson tension rod and Hopkinson compression rod, the tension rod is used to measure the uniaxial dynamic tensile properties of materials, and the compression rod is used to measure the uniaxial dynamic compression properties of materials . [0003] Materials in actual service are usually in a multi-axial complex stress state, and t...

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Problems solved by technology

However, the patent uses two discharge thyristors to control the discharge of two discharge coils respectively, and the discharge delay error of the discharge thyristor still exists, and the difference in the peak value of the electromagnetic force loading caused by the manufacturing error of the discharge coil is unavoidable, and multi-directional synchronous equivalent loading not fully guaranteed

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