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基于晶体塑性理论中关于自硬化和交互硬化的处理方法,建立了金属薄板各向异性主轴强化计算模型。以冷轧钢板为例,对经历不同大小预应变的各角度方向板料分别切取试样并进行单向拉伸和压缩试验,获得了预变形前后各向异性主轴方向上的拉压屈服应力偏量变化量,根据强化计算模型的一般表达式,确定了模型中的参数,并结合离散型屈服准则预测了其沿主轴方向加载的后继屈服轨迹变化趋势。结果表明,当对板料沿不同方向施加预应变时,该模型可较好地对各向异性主轴方向上的拉压屈服应力偏量变化进行描述和计算。该方法可直观体现主轴方向与其他方向之间的交互影响关系。
Based on the crystal plasticity theory about the self-hardening and the mutual hardening, the calculation model of the anisotropy of the metal sheet is established. Taking cold-rolled steel plate as an example, the specimens under different pre-strain angles were cut and uniaxial tension and compression tests were carried out respectively. The yield stress of the tension-compression in the direction of anisotropy principal axis before and after pre-deformation Based on the general expression of the fortified calculation model, the parameters in the model were determined. The trend of the yield point following the principal axis loading was predicted by using the discrete yield criterion. The results show that the model can well describe and calculate the variation of yield stress and deflection of tension and compression in the direction of principal axis of anisotropy when the prestrain is applied to the sheet in different directions. The method can intuitively reflect the interaction between the main axis direction and other directions.