Semi-Solid Near-Net Forming of Eco Functionally Graded Material with Low Load on Environment

本研究对低环境载荷下铝基生态功能梯度材料（FGM）的近净成形进行了研究。fgm是一类具有连续材料成分变化的复合材料。人们发现女性生殖器切割具有良好的热负荷和耐磨性。为了经济地生产fgm， Fukui和他的同事提出并开发了一种离心技术。在目前的SPH分析中，铝熔体被近似为不可压缩流体，其粘度。SiC（固相）颗粒被建模为刚性颗粒。假定液相（铝熔体）的流动由下列方程控制。在目前的二维SPH模拟中，SiC颗粒以显式的方式放置在模型中。分布的颗粒在尺寸上比实际的SiC颗粒大得多。然而，尺寸比冲头和模具之间的间隙要小得多。因此，我们认为SPH模型中的粒子足够小，可以代表SiC粒子。如图1所示，每个SiC颗粒由12个SPH颗粒组成。SPH粒子总数为782351个，即水平方向上放置1951个，垂直方向上放置401个。忽略SiC体积分数的波动，将富碳化硅区和富铝区SiC体积分数分别设置为30%和0%。

In present research, an investigation is being carried out on the near net shape forming of Al-base eco- functionally graded material (FGM) with low load on environment. FGMs are a class of composite materials that have continuous material composition changes. FGMs have been found to have good resistances to thermal loadings and wear. In order to produce the FGMs economically, Fukui and his colleagues proposed and have developed a centrifugal technique.In present SPH analyses, the aluminum melt is approximated by an incompressible fluid whose viscosity. is determined according to its temperature and SiC (solid phase) particles are modeled as rigid particles. The flow of liquid phase (aluminum melt) is assumed to be governed by the following equations.In present two-dimensional SPH simulation SiC particles are placed in the model in an explicit manner. The distributed particles are much larger than the actual SiC particles in their sizes. However, the sizes are much smaller than that of gap between the punch and the die. Therefore, we think that the particles in the SPH model are small enough to represent the SiC particles. Each SiC particle consists of 12 SPH particles as illustrated in Figure 1. There are a total of 782351 SPH particles, i.e., 1951 and 401 SPH particles are placed in the horizontal and the vertical directions, respectively. The fluctuations in the volume fraction of SiC were ignored and the volume fractions of SiC in SiC and aluminum rich regions were set to be 30 % and 0 %, respectively.