金属箔材微变形量冷轧时质点流动的研究

实验发现金属箔片经微变形量冷轧，轧件存在前端影响优势区和出现强度、硬度降低，塑性增高的自行软化现象。研究认为轧件质点流动异常现象是前刚端与变形区摩擦阻力共同作用的结果，加工组织自行软化现象是材料在长时期低应力场作用下珠光体中碳化物由片层状趋向球状的结果。

薄板超塑性胀形的金属流动分析

分别在板厚均匀变薄和板厚呈线性规律变化两种假设的基础上 ,对薄板超塑性胀形过程中金属的变形规律及质点流动进行了分析 ,导出了变形前、后 ,质点点位的对应关系式 。

雷诺输运方程的推导方法及其比较

分别采用针对流体质点系统的拉格朗日（Ｌａｇｒａｎｇｅ）法和针对流场中控制体的欧拉（Ｅｕｌｅｒ）法推导得到了雷诺（Ｒｅｙｎｏｌｄｓ）输运方程。并对上述两种方法的推导过程进行了分析比较。

Numerical simulations on material flow behaviors in whole process of friction stir welding

A finite element model based on solid mechanics was developed with ABAQUS to study the material flow in wholeprocess of friction stir welding （FSW）, with the technique of tracer particles. Simulation results indicate that the flow pattern of thetracer particles around the pin is spiral movement. There are very different flow patterns at the upper and lower parts of the weld. Thematerial on the upper surface has the spiral downward movement that is affected by the shoulder and the lower material has the spiralupward movement that is affected by the pin. The velocity of the material flow on the periphery of the stirring pin is higher than thatat the bottom of the stirring pin. The material can be rotated with a stirring pin a few times, agreeing well with the previousexperimental observation by tungsten tracer particles.

中厚板边部折叠缺陷计算

钢板边部折叠缺陷的产生导致中厚板切损和表面修磨量大,降低了中厚板产品质量和经济效益。基于中厚板轧制过程中边部质点沿纵向和横向流动规律,建立边部质点流动计算模型;对轧制过程中边部折叠质点位置进行跟踪模拟计算,分析得到钢坯头部弯曲下扣是导致边部折叠缺陷的主要原因;提出通过优化轧制工艺减少折叠不良影响、提高钢板成材率的方法。