Method for testing microzone fracture toughness of material

A fracture toughness and test method technology, applied in the direction of analyzing materials, using stable tension/pressure to test material strength, strength characteristics, etc., can solve problems such as inability to apply small-sized test samples, and achieve high dimensional measurement accuracy , High measurement accuracy and precise positioning effect

Active Publication Date: 2017-01-04
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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Problems solved by technology

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a test method for the fracture toughness of material micro-regions, which is used to solve the technical problems that cannot be applied to smaller-sized test samples or microstructures in the prior art

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  • Method for testing microzone fracture toughness of material
  • Method for testing microzone fracture toughness of material
  • Method for testing microzone fracture toughness of material

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Embodiment Construction

[0022] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] The content of the present invention is a test method for plane stress fracture toughness of ultra-thin unilateral notch tensile specimens based on in-situ observation. This embodiment provides a test method for the fracture toughness of a material micro-region, including: preparing an ultra-thin unilateral notched tensile sample, performing multiple loading and unloading operations on an in-situ tensile testing machine, and in-...

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Abstract

The invention provides a method for testing the microzone fracture toughness of a material. The method comprises the following steps: preparing an ultrathin single-edge notched tensile (SENT) specimen; performing repeated loading and unloading operations on an in-situ tensile test machine; recording test load Fi, crack length ai and notch opening displacement Vi by virtue of a scanning electron microscope in-situ test machine; calculating a Ki value for a brittle material and calculating a Ji value for a ductile material; and drawing a K-a curve or J-R curve capable of characterizing crack propagation fracture resistance, thereby obtaining a stress intensity factor K or J integral capable of characterizing the fracture toughness of a miniature specimen. The ultrathin SENT specimen is adopted to measure the microzone fracture toughness of a metallic material, so that the problem that measurement on fracture toughness of ultrathin members and accurate microzones of a large specimen based on traditional standards cannot be realized is solved, and the method has the characteristics of accurate crack tip positioning and high dimension measurement accuracy.

Description

technical field [0001] The invention belongs to a test method, and relates to a test method for material fracture toughness, in particular to a test method for material micro-zone fracture toughness. Background technique [0002] The toughness performance of materials against crack propagation and fracture is called fracture toughness, which is the toughness parameter of materials against brittle fracture. The current standard samples for fracture toughness testing usually use compact tensile specimens (25×60×65mm) and three-point bending specimens (20×40×180mm). For brittle materials, the test method is the single-specimen loading method. For ductile materials, the test methods include the single-specimen flexibility method and the multi-specimen method. However, the existing test methods for testing fracture toughness are mostly suitable for larger-sized test samples, and cannot be applied to smaller-sized test samples or microstructures, such as the fracture toughness t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N1/28G01N1/32
CPCG01N1/286G01N1/32G01N3/08G01N2001/2873G01N2203/0017G01N2203/0067
Inventor 吴海利丁玉明安春香刘霞夏健丁丽锋王朋
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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