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Pure I type dynamic fracture test piece for hard composite material

A composite material, I-type technology, applied in the direction of analysis materials, preparation of test samples, instruments, etc., can solve the problem of not considering the influence of accuracy and authenticity, so as to facilitate the propagation of stress waves, avoid asymmetric loading, and reduce stress concentrated effect

Inactive Publication Date: 2014-01-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is to obtain the type I fracture surface, without considering the influence of the optimization of the structure on the accuracy and authenticity of the experimental results

Method used

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  • Pure I type dynamic fracture test piece for hard composite material
  • Pure I type dynamic fracture test piece for hard composite material
  • Pure I type dynamic fracture test piece for hard composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present invention is a pure I-type dynamic fracture test piece of hard composite material, the overall shape is a disk-shaped structure, the upper and lower surfaces are parallel to each other, the thickness of the disk is 0.2 times the diameter, and two platforms are symmetrically arranged on the circumference of the disk. The two platforms are parallel and have the same size. A penetrating straight groove crack is set in the diameter direction between the two platforms on the disc. The length of the penetrating straight groove crack is 0.6 times the diameter of the disc. The penetrating straight groove crack is about the The position of the center of the circle is symmetrical; the platform is perpendicular to the through-straight-groove crack, and the center angle corresponding to the length of the through-straight-groove crack is 15°.

Embodiment 2

[0024] The present invention is a pure I-type dynamic fracture test piece of hard composite material, the overall shape is a disk-shaped structure, the upper and lower surfaces are parallel to each other, the thickness of the disk is 0.3 times the diameter, and two platforms are symmetrically arranged on the circumference of the disk. The two platforms are parallel and have the same size. A penetrating straight groove crack is set in the diameter direction between the two platforms on the disc. The length of the penetrating straight groove crack is 0.7 times the diameter of the disc. The penetrating straight groove crack is about the The position of the center of the circle is symmetrical; the platform is perpendicular to the through-straight-groove crack, and the center angle corresponding to the length of the through-straight-groove crack is 30°.

Embodiment 3

[0026] Such as figure 1 , 2 , as shown in 3:

[0027] The present invention is a pure I-type dynamic fracture test piece of hard composite material, the overall shape is a disk-shaped structure, the upper and lower surfaces are parallel to each other, the thickness of the disk is 0.25 times the diameter, and two platforms are symmetrically arranged on the circumference of the disk. The two platforms are parallel and have the same size. A through-straight-groove crack is set in the diameter direction between the two platforms on the disc. The length of the through-straight-groove crack is 0.5 times the diameter of the disc. The position of the center of the circle is symmetrical; the platform is perpendicular to the through-straight groove crack, and the center angle corresponding to the length of the through-straight groove crack is 20°.

[0028] combined with figure 1 , the structural feature is disc-shaped, and the center angle corresponding to the platform is 20°, which ...

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Abstract

The invention provides a pure I type dynamic fracture test piece for hard composite material. The whole test piece is in a round disc shape, the upper surface of the test piece is parallel to the lower surface of the test piece, two platforms are arranged on the circumferential direction of the round disc, the two platforms are parallel to each other and have a same size, a through direct-groove type crack is arranged between the two platforms in the diameter direction and is symmetric with respect to the center of the round disc; and the platforms are perpendicular to the direct-groove type crake. The test piece is provided with a direct-groove type through crack, the expansion of the direct-groove type through crack can be directly guided so as to obtain a pure I type crack; parallel loading platforms are arranged in the circumstantial direction so as to assist the contact of the incident rod and the transmission rod and the propagation of stress waves, and effectively reduce the stress concentration; no new clamping tool or press rod is needed, and only simple clamping tools can meet the experiment reliability requirement.

Description

technical field [0001] The invention belongs to the field of dynamic fracture mechanics, in particular to a pure type I dynamic fracture test piece of hard composite material. Background technique [0002] Dynamic fracture mechanics is a branch of solid mechanics and has been a research hotspot in the past ten years. Compared with other branches of fracture theory, dynamic fracture mechanics is the most immature branch, and the basic concept was gradually established in the late 1970s. So far, dynamic fracture mechanics is still not a mature discipline. Compared with static fracture mechanics, dynamic fracture mechanics not only has certain difficulties in dealing with mathematical problems, but also the complexity of physics makes experimental research more difficult. In addition, the complexity and limitations of relevant testing techniques for dynamic fracture mechanics research at this stage also restrict the development speed of this discipline. At present, scholars ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/00
Inventor 汪文强鞠玉涛陈雄郑健周长省许进升孙朝翔胡少青王鸿丽
Owner NANJING UNIV OF SCI & TECH
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