Test method of plane strain breaking tenacity of aluminum alloy stamp forgings

A fracture toughness and plane strain technology, which can be used in measurement devices, strength properties, instruments, etc., to solve problems such as difficult to measure accurately, and achieve accurate test results.

Inactive Publication Date: 2013-06-12
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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Problems solved by technology

[0004] K IC Compared with other mechanical properties of materials, it is a relatively sensitive mechanical performance index, which not only depends on internal factors such as material composition and structure, but also is affected by external factors such as loading rate, temperature and sample thickness (that is, stress state). Strongly affected by conditions, it is difficult to measure

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  • Test method of plane strain breaking tenacity of aluminum alloy stamp forgings
  • Test method of plane strain breaking tenacity of aluminum alloy stamp forgings
  • Test method of plane strain breaking tenacity of aluminum alloy stamp forgings

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Embodiment Construction

[0019] Below, the method for testing the plane strain fracture toughness of aluminum alloy die forgings of the present invention is described in detail in conjunction with the examples:

[0020] (i) Preparation of samples

[0021] Process die forgings into compact tensile samples with a thickness of 10mm. Take three samples with the same state during the test, clean the cracks of the samples with acetone and other organic solvents to avoid oil pollution affecting crack growth, number the samples, and use Digital calipers and micrometers measure the width W and thickness B of the sample respectively;

[0022] (ii) Determination of crack length

[0023] Install the sample in the fixture, and perform fatigue pre-cracking on the fatigue testing machine. The maximum fatigue load is 3kN, the fatigue stress ratio is 1 / 10, and the fatigue frequency is 10Hz. ) When a / W=0.45~0.55, stop fatigue, break the sample at a rate of 1mm / min, record the breaking force Fm measured on the testing...

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Abstract

The invention provides a test method of plane strain breaking tenacity of aluminum alloy stamp forgings. The test method includes the following steps: (i) preparing samples; (ii) confirming the crack length; (iii) confirming critical load permeability quotient (PQ); (iv)calculating out KQ. The test method of the plane strain breaking tenacity of the aluminum alloy stamp forgings is capable of providing a best value of the sample thickness for a 7A60 alloy KIC test and enables the test results to be accurate.

Description

technical field [0001] The invention belongs to a test method for plane strain fracture toughness of aluminum alloy die forgings, in particular to a test method for plane strain fracture toughness of 7A60 aluminum alloy die forgings. Background technique [0002] In the process of casting, smelting and forging, materials are prone to defects such as pores, inclusions, porosity, shrinkage cavities, white spots and cracks; damage and cracks will inevitably occur in heat treatment, machining and use, so it must be Introduced the concept of fracture mechanics. In fracture mechanics, the fracture toughness of materials is an important index to evaluate the mechanical properties of materials, and it is also one of the important parameters that must be considered in the design of components. Therefore, it is particularly important to accurately and effectively measure the fracture toughness of materials. [0003] As far as the 7A60 die forging is concerned, the stress σ of the dis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
Inventor 肖凯业郑晓静寇益强郑文
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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