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A method for measuring and determining the spalling strength of quasi-brittle materials under high strain rate

A technology of brittle materials and spalling strength, applied in the direction of measuring devices, analyzing materials, strength characteristics, etc.

Inactive Publication Date: 2018-06-15
POWERCHINA XIBEI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The fact that during spalling tests the stress and strain rates of the specimens vary significantly along the length is why spalling tensile data have not been directly used for decades to compare with other well-controlled dynamic tensile tests. The reason for comparing the dynamic tensile properties obtained by the tensile test technique

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  • A method for measuring and determining the spalling strength of quasi-brittle materials under high strain rate
  • A method for measuring and determining the spalling strength of quasi-brittle materials under high strain rate
  • A method for measuring and determining the spalling strength of quasi-brittle materials under high strain rate

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0020] Such as figure 1 with 2 Shown, a kind of concrete axial dynamic tensile fracture test method based on Hopkinson's principle is characterized in that, comprises the following steps:

[0021] (1) A composite pulse shaper 2 prepared by superimposing a polytetrafluoroethylene disk 3 on an annealed copper disk 4 is installed at the impact end of the incident rod 1, and the vertical end face of the other end of the incident rod 1 is connected to the cylindrical concrete specimen 5 The vertical end face at one end fits closely;

[0022] (2) Paste the strain gauge 6 in the middle of the incident rod 1, and paste the strain gauge 9 on the concrete specimen 5, respectively pasting at the 4 point...

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Abstract

The invention discloses a dynamic spall tensile test method for a quasi-brittle material based on a Hopkinson principle. The method has the advantages that isosceles triangle-like incident waves obtained by virtue of a shaping technology can help a spall test and other dynamic tensile test methods to establish a relationship on the aspect of the data interpretation when the spall sample reaches a constant-strain-rate deformation state and a uniform tensile stress state. The amplitude of the isosceles triangle-like incident wave can be adjusted by virtue of fine pulse shaping, while the duration of the waves can be adjusted by changing a length of a collision rod. By virtue of the characteristics, the novel technique is suitable for the spalling application of different materials and different sizes.

Description

technical field [0001] The invention relates to a concrete dynamic spalling tensile test method based on the Hopkinson principle, and belongs to the technical field of concrete dynamic tensile test methods. Background technique [0002] In the current engineering and mechanics circles, the research on the performance of heterogeneous and multi-directional materials has become a hot spot, among which the research on concrete structures has attracted extensive attention. In the natural environment, in addition to static loads, natural disasters such as typhoons, earthquakes, and traffic accidents such as traffic accidents often generate impact loads on concrete structures, causing concrete to deform at a high strain rate, resulting in dynamic mechanical properties. [0003] The study of dynamic tensile properties of concrete materials is complicated because of the extremely low tensile failure strength and tensile failure strain of concrete. Many scholars at home and abroad u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/307G01N3/02
CPCG01N3/02G01N3/307G01N2203/0044
Inventor 邵羽陈徐东袁昊天陈逸杰聂宇
Owner POWERCHINA XIBEI ENG