摘要
基于金属粉末材料的塑性变形理论及Shima-Oyane屈服函数,采用体积可压缩有限元法和Marc有限元软件对纯铝粉末单向及双向模压过程进行了三维有限元模拟,探讨了粉末材料在两种模压过程中的变形特征和流动规律。模拟结果表明,同等载荷条件下,双向压制与单向压制相比,能够获得密度更高及更均匀的压坯,但两者都存在局部高密度区和低密度区;随着压力载荷的增加,平均相对密度快速增加,然后趋于饱和。模拟结果对压制工艺的制定有指导意义。
Based on the plasticity theory of powder material and Shima-Oyane yield criteria, the unidirectional and bidirectional compaction process of aluminum powder was investigated by utilizing the volume compressible finite element method and finite element analysis software of Marc. The 3- D deformation feature and granular flow rule were obtained. The results show that the bidirectional compaction can achieve the higher and more homogeneous green density comparing with the unidirectional ones at the same load condition. Local higher density and lower ones appear both the unidirectional and the bidirectional compaction process. The value of average relative density increases rapidly and then turns to saturation as the load enlarged. This conclusion may provide basis for the compacting technology.
出处
《铸造技术》
CAS
北大核心
2009年第10期1330-1333,共4页
Foundry Technology
关键词
粉末压制
塑性变形
有限元方法
Powder compaction process
Plastic shaping
FEM compcting tecnics