Observation and test apparatus for cavity evolution in test pieces under tensile impact and test method

A technology of test device and test method, which is applied in the direction of testing the strength of materials with one impact force, and achieves the effect of simple test method.

Inactive Publication Date: 2013-10-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no experimental device and test method for observing the evolution of holes in slab members under impact tension.

Method used

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  • Observation and test apparatus for cavity evolution in test pieces under tensile impact and test method
  • Observation and test apparatus for cavity evolution in test pieces under tensile impact and test method
  • Observation and test apparatus for cavity evolution in test pieces under tensile impact and test method

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the embodiments of the drawings.

[0023] As shown in the figure, a test device for observing the evolution of voids in a specimen under impact tension includes micro-strain gauges symmetrically arranged on the two surfaces of the slat specimen 1, and the micro-strain gauges include two first micro-strain gauges 21 And 22 and two second micro-strain gauges 31 and 32, the slat test piece 1 includes a non-cavity cluster area 11 and a cavity cluster area 12 preset with a plurality of cavities 121, and the slat test piece 1 is fixedly installed in Between the input rod 41 and the output rod 42 of the Hopkinson pull rod device, the non-cavity cluster area 11 is close to the input rod 41, the cavity cluster area 12 is close to the output rod 42, and the two first micro strain gauges 21 and 22 are arranged in the non-cavity cluster area. In the cavity cluster area 11, two second micro-strain gauge...

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Abstract

The invention discloses an observation and test apparatus for cavity evolution in test pieces under tensile impact and a test method. The observation and test apparatus comprises first micro strain gauges and second strain gauges symmetrically arranged at two surfaces of a lath test piece, wherein the lath test piece comprises a non-cavity cluster region and a cavity cluster region and is fixedly mounted on a Hopkinson rod device, the non-cavity cluster region is near an input rod, the cavity cluster region is near an output rod, a plurality of the first micro strain gauges are arranged at the non-cavity cluster region, a plurality of the second micro strain gauges are arranged between cavities, one first micro strain gauge is connected with a high-speed camera through a super dynamic strain gauge, and the remaining first micro strain gauge and all the second strain gauges are connected with a oscilloscope through the super dynamic strain gauge. According to the invention, researchers can conveniently master an evolution rule of the cavities in the test pieces under controllable and measurable tensile impact load. The apparatus and the method can also be applied for impact tensile strength and failure test of industrial and engineering lath-structural members containing pores.

Description

Technical field [0001] The invention relates to an observable test device and a test method for the growth and aggregation law of microcavities under impact tension, and can also be applied to impact tensile strength and failure tests of slat structures with holes. Background technique [0002] The dynamic tensile fracture of ductile metal materials has been attributed to the dynamic nucleation, growth and aggregation process of microcavities in the material from the micro and microscopic mechanism. Among them, the dynamic accumulation of holes induces mutations and forms dynamic fracture of the material. Attention to the critical stage of dynamic fracture process has become the frontier of dynamic fracture research. Although there are several theoretical models of hole accumulation, there are no experimental devices and methods for direct inspection and evaluation. The reason is that the micro-holes are located inside the material and are difficult to observe. Moreover, in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/30
Inventor 王焕然马东方陈大年
Owner NINGBO UNIV
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