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Method for measuring two-dimensional partial micro-defect group damage of toughed material

A technology of ductile materials and measurement methods, which is applied in the direction of measuring devices, analyzing materials, and using stable tension/pressure to test the strength of materials, etc., can solve problems such as incorrect calculation parameters of ductile materials, and achieve overcoming configuration dependencies and measuring high precision effect

Inactive Publication Date: 2012-09-05
XI AN JIAOTONG UNIV
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Problems solved by technology

[0013] The purpose of the present invention is to provide a damage measurement method for two-dimensional local micro-defect populations of ductile materials based on damage-driving force engineering parameters. loads, which solves the problem of incorrect calculation parameters for ductile materials

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  • Method for measuring two-dimensional partial micro-defect group damage of toughed material
  • Method for measuring two-dimensional partial micro-defect group damage of toughed material
  • Method for measuring two-dimensional partial micro-defect group damage of toughed material

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Embodiment Construction

[0034] A method for measuring the damage of two-dimensional local micro-defect groups in ductile materials, comprising the following steps: (1) known elastic modulus E and yield stress σ of ductile materials (such as aluminum alloys, nickel alloys, stainless steel, etc.) Y , strength limit σ b >σ Y , power hardening exponent n>1, power hardening coefficient and fracture toughness K IC . Such as figure 1 As shown, the single hole with radius R in the planar plate of ductile material is calculated by finite element ( figure 1 b), a single elliptical hole (the long axis is a, the short axis is b; respectively take b / a=0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1) and a single centrosymmetric crack with a half-crack length of a ( figure 1 a, take the radius of the hole equal to the half-crack length, R=a) respectively reach the critical state under the tensile load in the vertical direction (that is, the boundary material of the circular hole or the elliptical hole has been subject...

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Abstract

The invention discloses a method for measuring two-dimensional partial micro-defect group damage of a toughed material, and the method is characterized by comprising the following steps: computing through finite element so that the holes, elliptical holes and cracks of a large toughed material plane plate respectively reach the critical states under the tensile load condition in the vertical direction; respectively computing the displacement, strain and stress of the density points on a closed curve in the elastic region outside the surrounding holes, the elliptical holes and the cracks in the critical state; computing the partial derivative of the displacement by utilizing a differential method; computing and determining the yield stress (sigma Y) envelop curve of the material in the critical state; drawing the curve of the M integral critical value and elliptical principal axis ratio of the toughed material; determining the equivalent weight area of the cracks; and testing the real damage test piece of the toughed material under the monotone tensile load on an MTS (Microsoft Transaction Server) material testing machine according to the equivalent weight area formulas (2) or (3) of the cracks.

Description

technical field [0001] The invention relates to a method for measuring the damage of two-dimensional local micro-defect groups of ductile materials by using damage mechanics and solid mechanics conservation integrals. Background technique [0002] Ductile materials such as metallic materials are widely used in engineering structures. Due to various accidents during use, local micro-defect group damage inevitably occurs on the surface or inside, and many damages are still penetrating and can be treated as two-dimensional damage. These damages directly affect the safety and service life of components. It is important to evaluate the grade, stability, and risk of these injuries. [0003] The earliest proposal of the M integral parameter can be traced back to the pioneering work of the famous British scholar Eshelby more than half a century ago. In the following decades, people gradually realized its intrinsic physical meaning and application prospects in fracture mechanics, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/08G01N3/08
Inventor 刘启达陈宜亨
Owner XI AN JIAOTONG UNIV
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