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System and method for performing impact loading on micro test piece and measuring dynamic mechanical property

A technology of dynamic mechanics and measurement system, which is applied in the field of structural deformation and mechanical experiments, to achieve the effects of fast speed measurement, easy repeated tests, and high energy conversion rate

Inactive Publication Date: 2011-07-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0006] The invention relates to a system and method for measuring impact loading and dynamic mechanical properties of micro-specimen. The system and method solve the problems of the dynamic mechanical properties of micro-electromechanical systems (MEMS), and the research of membrane materials such as piezoelectric and ferroelectric films, etc. The problem

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  • System and method for performing impact loading on micro test piece and measuring dynamic mechanical property
  • System and method for performing impact loading on micro test piece and measuring dynamic mechanical property

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

[0036] Such as figure 1 As shown, it is the micro-specimen impact loading and dynamic mechanical property measurement system described in Embodiment 1 of the present invention, including: an electromagnetic pulse emission device 1, a separate Hopkinson rod device 2, a stress-strain test device 4, a high-speed microscope The two-dimensional deformation measurement device 5 and the data analysis device 6 are composed of five parts.

[0037] Further, among them, such as figure 2 As shown, the electromagnetic pulse transmitting device 1 provides power for the whole system, the electromagnetic pulse transmitting device 1 is connected with the separate Hopkinson rod device 2, and the electromagnetic pulse transmitting device 1 specifically includes: an electromagnetic coil group 11, a power plug 12 , indicat...

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Abstract

The invention relates to a system and a method for performing impact loading on a micro test piece and measuring dynamic mechanical property. The method comprises the following steps of: instantly accelerating a bullet by using an electromagnetic pulse launch technology and launching the bullet at high speed; transmitting a stretching stress wave generated by collision of the bullet to the micro test piece by using a separated Hopkinson bar technology so as to generate the impact loading on the micro test piece; recording strain data of an input bar and an output bar, and acquiring an enlarged surface dynamic deformation image of the micro test piece; analyzing and obtaining a stress strain curve of the micro test piece subjected to the impact loading having different strain rates; and analyzing the surface dynamic deformation image of the micro test piece and obtaining a distribution of a bidimensional displacement field and a strain field during dynamic impact loading of the micro test piece. By the system and the method, the problem of research on the dynamic mechanical property of a micro electro mechanical system (MEMS), and membrane materials such as piezoelectric thin films, ferroelectric thin films and the like is solved.

Description

technical field [0001] The invention relates to the technical field of structural deformation and mechanical experiments. Specifically, the invention relates to a system and method for measuring impact loading and dynamic mechanical properties of micro-specimen. Background technique [0002] Many engineering materials and structures are subjected to impact loads in which materials undergo deformation at high strain rates. A large number of experimental results show that under different strain rates, the mechanical properties of materials are often different. Therefore, in practical engineering applications, the dynamic mechanical properties of materials are of great significance to structural safety and reliability design. [0003] At present, when measuring the mechanical properties of materials at high strain rates, the most widely used technique is the split Hopkinson pressure bar (SHPB for short), which was first proposed by Hopkinson in 1914, and Crowe Kolsky improved...

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Application Information

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IPC IPC(8): G01N3/317G01N3/06
Inventor 刘战伟王一沛吕新涛马少鹏胡更开
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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