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Specimen for pure II type dynamic breaking and experiment method

An experimental method and test piece technology, applied in the field of material mechanics, can solve the problems of pure type II fracture of samples that cannot ensure data accuracy, difficult to measure transmission waveform, difficult to measure accurately, etc.

Pending Publication Date: 2018-08-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the drop weight or pendulum type testing machine has the disadvantages of limited loading rate, unstable loading signal and difficult to measure accurately.
At present, when using the Hopkinson rod to measure the dynamic fracture toughness of materials, there are still shortcomings such as complex experimental equipment, easy introduction of type I fracture components, and difficulty in measuring transmission waveforms, which cannot ensure the accuracy of the data and the pure type II of the sample. fracture

Method used

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  • Specimen for pure II type dynamic breaking and experiment method
  • Specimen for pure II type dynamic breaking and experiment method
  • Specimen for pure II type dynamic breaking and experiment method

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Embodiment Construction

[0016] The present invention will be described in detail below in combination with specific embodiments.

[0017] The present invention proposes a novel fracture specimen and matching fixtures for pure type II experiments, such as figure 1 and figure 2 As shown, sample 1 and fixture 2 are both axisymmetric structures. Sample 1 has a loading end 101 and two supporting ends 102, and the surface of sample 1 is polished to reduce friction with the end surface of the rod during the experiment.

[0018] Make two prefabricated cracks 103 on both sides of the loading end 101 of the pattern 1, figure 1 The dotted line in the middle is the prefabricated crack 103 processed by wire cutting, with a width of 0.3 mm. In order to prevent the lateral displacement of sample 1 and the generation of type I components, a matching fixture 2 was designed and used in conjunction with it in the experiment. One end of the clamp 2 is a round tube 201, the inner diameter of which is the same as the...

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Abstract

The invention discloses a specimen for pure II type dynamic breaking and an experiment method. A specimen and a clamp are respectively of an axis symmetric structure; the specimen is provided with a loading end and two support ends; the two sides of the loading end of the specimen are provided with two prefabricated cracks; a circular pipe is arranged at one end of the clamp, the inner diameter ofthe circular pipe is the same with the outer diameter of a transmission rod, and the circular pipe can be tightly sheathed on the transmission rod; the other end of the clamp is provided with two grooves, the grooves are matched with the support ends of the specimen, and the support ends can be tightly inserted into the grooves; one end of an incident rod is provided with a groove, the shape of the groove is matched with the shape of the loading end, and the loading end can be tightly inserted into the groove; a stress curve of the rod is obtained by a Hopkinson press rod technique, and is inputted to perform number simulation and calculation. The specimen has the beneficial effects that the method is simple, and the verification result is accurate.

Description

technical field [0001] The invention belongs to the technical field of material mechanics and relates to a new experimental method for pure type II dynamic fracture. Background technique [0002] During service, brittle materials such as composite materials, ceramics, and rocks often suffer from type II fractures due to impact shear loads, which lead to rapid loss of bearing capacity of engineering structures. Therefore, it is of great scientific significance and engineering value to test the pure mode II dynamic fracture performance of metal materials under impact shear. [0003] At present, the research on dynamic fracture mechanics often adopts pendulum impact testing machine, drop weight impact testing machine and Hopkinson bar device for loading. Among them, the drop weight or pendulum type testing machine has the disadvantages of limited loading rate, unstable loading signal and difficult to measure accurately. At present, when using the Hopkinson rod to measure the ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/08
CPCG01N1/286G01N3/08
Inventor 许泽建黄风雷何晓东
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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