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从应变空间表述的塑性增量本构模型一般形式出发,根据航空铝合金等线性强化材料特性建立应变空间弹塑性本构模型。应变空间本构模型所需参数通过应力空间中对应参数转化得到,材料的屈服准则、流动法则、内变量和塑性模量等准则及参量均以应变空间的形式建立,从而构建适合铝合金等线性强化材料的弹塑性增量模型。通过算例计算,证明该模型与应力空间增量本构模型等效。该模型所需计算变量为可在线获得的应变,使应力分析计算大为简化,可以方便地求解应力空间本构模型难以求解的强化材料变形问题。因此特别适合于航空铝合金厚板预拉伸等金属变形加工工艺的应力分析。
Based on the general form of plastic incremental constitutive model in strain space, a strain-space elastic-plastic constitutive model is established according to the properties of linear strengthening materials such as aviation aluminum alloy. The required parameters for the constitutive model of strain space are obtained through the corresponding parameters in the stress space. The yield criterion, flow law, internal variable and plastic modulus of the material are all established in the form of strain space. Therefore, Elastic-plastic Incremental Model of Reinforced Material. Through calculation example, it is proved that this model is equivalent to incremental constitutive model of stress space. The computational variables required for the model are those available online, simplifying the stress analysis and calculation and easily solving the material deformation problem that is difficult to be solved by the constitutive model of stress space. Therefore, it is especially suitable for the stress analysis of metal deformation processing technology such as pre-stretching of aviation aluminum alloy plate.