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Crack prefabricating device of non-metal material fracture toughness test

A non-metallic material, fracture toughness technology, applied in the field of non-metallic material fracture toughness test, can solve the problems of non-metallic materials such as low strength, temperature sensitivity, long preparation cycle, etc., to reduce prefabrication time and reduce unqualified products rate, the effect of increasing the test rate

Inactive Publication Date: 2015-04-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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AI Technical Summary

Problems solved by technology

Crack prefabrication of metal materials usually adopts mechanical processing or heat treatment on the crack source, while non-metallic materials have low strength and are sensitive to temperature. Under the condition of limited initial crack length, it cannot be prepared by prefabrication of metal material cracks.
For some non-metallic material samples, the notch is first processed on one side of the sample, and then the crack is prefabricated by applying bending moment or fatigue load. This method of applying bending moment is only suitable for the preparation of cracks on one side of the sample. Notch prefabricated cracks on both sides of the center hole of the sample cannot be realized
In addition, the fatigue testing machine is used to prefabricate the cracks, and the cracks are expanded by periodic loading. Although it can be applied to various sample types, the preparation period is long, and the length of the cracks is not easy to control

Method used

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  • Crack prefabricating device of non-metal material fracture toughness test
  • Crack prefabricating device of non-metal material fracture toughness test
  • Crack prefabricating device of non-metal material fracture toughness test

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing and embodiment the technical solution of the present invention is described in further detail:

[0011] as attached Figure 1~2 As shown, the prefabricated crack device for the fracture toughness test of non-metallic materials is characterized in that: the device includes a base 1, and at the rear of the base 1 is a boss 6 with a threaded hole, and the adjusting screw 2 passes through the Threaded hole, the rear end of the adjusting screw 2 is equipped with a rotating handle 7, the front end of the adjusting screw 2 is fixedly connected with the bottom end of the U-shaped knife rest 3, and the side plate 8 of the U-shaped knife rest 3 is embedded in the transverse groove 9 of the base 1 Among them, the U-shaped knife rest 3 can move back and forth along the transverse groove 9, and the blade 4 for prefabricating cracks is installed between the two side plates 8 of the open front end of the U-shaped knife rest 3. The cutting...

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Abstract

The invention provides a crack prefabricating device of a non-metal material fracture toughness test. The device can be used for carrying out crack prefabricating in the non-metal material fracture toughness test; a blade position is controlled by utilizing a manner of manually rotating an adjusting screw rod, so that the length of prefabricated cracks can be effectively controlled and the reject ratio of a prefabricated test sample is reduced. By virtue of the device, the crack prefabricating time of a sample can be greatly shortened and the testing speed is improved.

Description

technical field [0001] The invention relates to a prefabricated crack device for the fracture toughness test of non-metallic materials, which belongs to the technical field of sample preprocessing and preparation for physical property testing of materials, and particularly relates to the fracture toughness test of non-metallic materials. Cracked corners. Background technique [0002] The fracture toughness of a material is an index that characterizes the ability of a material to resist crack growth and measures the toughness of a material. Non-metallic materials are more sensitive to fatigue load and cracks than metal materials. Therefore, fracture toughness is one of the important indicators of non-metallic materials in material selection and material quality control. Crack prefabrication of metal materials usually adopts mechanical processing or heat treatment on the crack source, while non-metallic materials have low strength and are sensitive to temperature. Under the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 王晓丽郭世毅厉蕾聂磊丁宇婷
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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