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Method for obtaining metal Mises elastic-plastic constitutive structure in impact explosion

An elastoplastic and constitutive technology, applied in the field of impact explosion, can solve problems such as complex integral calculation process, low calculation accuracy and narrow applicability

Active Publication Date: 2019-10-25
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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  • Method for obtaining metal Mises elastic-plastic constitutive structure in impact explosion
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  • Method for obtaining metal Mises elastic-plastic constitutive structure in impact explosion

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Embodiment Construction

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

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

[0088] A method to ob...

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Abstract

The invention belongs to the field of impact explosion, and particularly relates to a method for obtaining metal Mises elastic-plastic constitutive in impact explosion. In this method, a plastic flowfactor dlambda is obtained through mathematical derivation; plastic correction is performed by assuming a constant equivalent strain rate and assuming that the direction of a bias stress tensor remains unchanged in the absence of plastic strain. The solution of the increment step from the elastic stage to the plastic stage and with plastic strain generation is divided into two stages: the first stage: the stress tensor of the material changes from the stress tensor sigman of the initial moment of the increment step to the stress tensor sigman + a of the initial yield moment of the increment step; and in the second stage, the stress tensor of the material changes from the stress tensor sigman+a of the initial yield moment of the increment step to the stress tensor sigman+1 of the final moment of the increment step. The integral algorithm effectively solves the problem of integral calculation of increment steps generated by plastic strain, and 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 are widely used in automobile collisions, mobile phone drops, blasting engineering, and explosive forming. They will experience large deformation, high strain rate, and high temperature effects in impact explosions. The research on Mises elastoplastic constitutive and calculation methods of metals under large deformation, high strain rate and high temperature has important engineering value. [0003] Since the calculation equation of the constitutive relation of metal materials not only affects the accuracy of the numerical simulation results, but also calculates every Gaussian integration point of all units in each incremental step, the constitutive calculation method also affects the numerical simulation results. Calcul...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06G06F30/20
Inventor 黄瑞源胡亮亮秦健
Owner NANJING UNIV OF SCI & TECH
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