Loading device and loading method for three-dimensional compound type crack growth test

A crack propagation and loading device technology, which is applied in the direction of measuring devices, using stable tension/pressure testing material strength, instruments, etc., can solve the problems of unseen three-dimensional crack testing loading devices, etc., to achieve convenient processing, accurate and reliable results strong effect

Inactive Publication Date: 2017-08-04
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no literature report on this kind of thre

Method used

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  • Loading device and loading method for three-dimensional compound type crack growth test
  • Loading device and loading method for three-dimensional compound type crack growth test
  • Loading device and loading method for three-dimensional compound type crack growth test

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] exist figure 1 Among them, the present invention is a loading device suitable for three-dimensional composite crack growth test, which is composed of internal fixture, external fixture, tested piece and testing system. The internal fixture includes: circular bushing 3 and pin shaft 4; the external fixture includes : C-shaped arc arm plate 1, circular plate 2, bolt 6, pin 7 and test machine chuck 8; the test system includes: high-power microscope 9, microscope reading rod 10, test machine 11, control switch 12 and test processing system 13.

[0028] exist figure 2 , is a partial enlarged view of the tested piece 5, and the two ends of the tested piece 5 are cylindrical, which is for the convenience of connecting with the internal fixture. The central part of the test piece 5 is a cube, and the transition between the cylinder and the cu...

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Abstract

The invention discloses a loading device and a loading method for a three-dimensional compound type crack growth test. The loading device comprises an inner clamp, an outer clamp, a tested piece and a test system, wherein the inner clamp is composed of a circular lining and a pin shaft; the outer clamp is composed of a C-shaped arc arm plate, a circular plate, a bolt, a pin and a tester chuck; the test system comprises high-power microscopes, a microscope reading rod, a tester, a control switch and a test treating system. The static loading or fatigue loading tests for single I, II and III type cracks and a multi-type combined three-dimensional compound type crack can be realized in the manner of adjusting an assembling angle of the clamp on the tester. The high-power microscopes arranged on the two sides of the crack surface of the tested piece can be used for observing the extension form including length and angle of the three-dimensional crack in real time. The loading device has the advantages of flexible adjustment for crack type and real-time observation for crack extension form.

Description

technical field [0001] The invention relates to a loading device and method suitable for a three-dimensional composite crack growth test, which can not only realize the growth test of a single three-dimensional crack of types I, II, and III, but also can combine multiple types of I, II, and III. The growth rate and direction of the crack can be obtained through the recorded relevant data, which is mainly used in the fields of fracture and fatigue. Background technique [0002] In modern engineering, the structure is subjected to tension and compression, plane shear, anti-plane shear and other forces, and it is easy to fail when the design strength of the material is not reached. This failure is caused by the microscopic defects of the material itself and the material during service. In order to prevent such sudden damage, it is necessary to know the propagation direction and growth rate of the three-dimensional crack under the compound load. In actual structures, components...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/04
CPCG01N3/08G01N3/04G01N2203/0066
Inventor 宋彦琦刘小珍李向上史久畅
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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