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A method to obtain elastic-plastic constitutive of metal mises in shock explosion

An elastic-plastic and constitutive technology, applied in the field of shock explosion, can solve the problems of narrow applicability, complex integral calculation process, low calculation accuracy, etc., and achieve the effect of high accuracy

Active Publication Date: 2022-07-12
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] In summary, there are problems such as low calculation accuracy, complex integral calculation process and narrow applicability in the prior art

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  • A method to obtain elastic-plastic constitutive of metal mises in shock explosion
  • A method to obtain elastic-plastic constitutive of metal mises in shock explosion
  • A method to obtain elastic-plastic constitutive of metal mises in shock explosion

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Embodiment Construction

[0086] The present invention will be described in further detail below with reference to the accompanying drawings.

[0087] Assumption: A method for obtaining the elastoplastic constitutive of metal Mises in impact explosion, characterized in that: when the material satisfies a general form of yield criterion in the stress space, that is, the yield stress is the tensor containing the equivalent plastic strain ε p , the actual strain rate tensor When the damage factor D is a function of one or more parameters in the temperature T; the temperature rise equation is: α where represents the plastic dissipation ratio, c d is the specific heat and ρ is the material density; the equation of state is p=Kθ, where K is the bulk modulus. The plastic correction is performed using the assumption of a constant equivalent strain rate and the assumption that the direction of the deviatoric stress tensor remains unchanged in the absence of plastic strain.

[0088] A method to obtain the...

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Abstract

The invention belongs to the field of impact explosion, in particular to a method for obtaining the elastic-plastic constitutive structure of metal Mises in impact explosion. In this method, the plastic flow factor dλ is mathematically derived, and the plastic correction is performed using the assumption of a constant equivalent strain rate and the assumption that the direction of the deviatoric stress tensor remains unchanged in the absence of plastic strain. The solution of the incremental step from the stage to the plastic stage and the plastic strain is generated is divided into two stages: in the first stage, the stress tensor of the material is changed from the stress tensor σ at the initial moment of the incremental step. n The stress tensor σ to the initial yield moment of the incremental step n+a ; In the second stage, the stress tensor of the material is changed from the stress tensor σ at the initial yield moment of the incremental step n+a The stress tensor σ to the final moment of the incremental step n+1 . The proposed integral algorithm effectively solves the integral calculation problem of incremental steps with plastic strain, and it is an accurate integral algorithm.

Description

technical field [0001] The invention belongs to the field of impact explosion, in particular to a method for obtaining the elastic-plastic constitutive structure of metal Mises in impact explosion. Background technique [0002] At present, metal structures have a wide range of applications in automobile collisions, mobile phone drops, blasting engineering and explosive forming, etc., and they will experience large deformation, high strain rate and high temperature effects in impact explosions. The research on Mises elastic-plastic constitutive and its calculation method of metals under large deformation, high strain rate and high temperature has important engineering value. [0003] Because the calculation equation of the constitutive relation of metallic materials not only affects the accuracy of numerical simulation results, but also calculates every Gauss integration point of all elements in each incremental step, the constitutive calculation method also affects the numer...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/20G06F119/14
CPCG06F30/17G06F2119/06G06F30/20
Inventor 黄瑞源胡亮亮秦健
Owner NANJING UNIV OF SCI & TECH
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