锻压技术

冷轧钢板各向异性强化计算模型

英文标题：Anisotropic strengthening calculating model of cold rolled steel sheet

作者：田曦阳董湘怀彭芳刘凯

单位：上海交通大学

分类号：TG381

出版年,卷(期):页码：2016,41(8):132-137

摘要：

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 processing method of self-hardening and interaction-hardening in crystal plasticity theory, a model of calculating strengthening along anisotropic principal axis of thin sheet metal was proposed. For the cold rolled steel sheet, the uniaxial tensile and compression tests were carried out by cutting simples along different directions of pre-deformation sheet, and the yield stress deviation increment was measured along the rolling direction and transversal direction respectively. Based on the expression of strengthening calculating model, model parameters were defined and the variation trend of the subsequent yield loci of interpolation-type orthotropic yield function was predicted. The results show that yield stress deviation increment along anisotropic principal axis can be well described by this model for different pre-deformation directions. The model can show the strengthening relationship between anisotropic axis direction and other directions directly.

基金项目：

国家自然科学基金资助项目（51275297）

田曦阳（1990-），男，硕士研究生董湘怀（1955-），男，博士，教授

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