Generalized shear-lag model for load transfer in SiC/Al metal-matrix composites
Generalized shear-lag model for load transfer in SiC/Al metal-matrix composites
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DOI：
10.1557/jmr.2003.0398
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发表时间：
2003-12-01
影响因子：
2.7
通讯作者：
Hong, SH
中科院分区：
文献类型：
--
作者：
Ryu, HJ;Cha, SI;Hong, SH
基于剪滞模型，分析了金属基复合材料（MMC）中圆柱形增强体的荷载传递效率。同时考虑了钢筋的几何形状和线形。根据力在纵向和横向上的平衡，从微分方程计算了传递到错位晶须上的应力。提出了一个新的参数，即有效高宽比，用以表征钢筋错边的荷载传递效率。有效长径比是MMC中增强体长径比和取向差角的函数。用取向差分布的概率密度函数来估计分布在基体中的所有取向差晶须的强化效果。考虑有效长径比和取向差分布对荷载传递效率的影响，提出了一个广义剪滞模型来解释非连续增强MMC的力学各向异性。
The load-transfer efficiency of reinforcement, in cylindrical forms in metal-matrix composite (MMC), was analyzed based on the shear-lag model. Both the geometric shape and alignment of reinforcement were considered. The stress transferred to a misaligned whisker was calculated from differential equations based on the force equilibrium in longitudinal and transverse directions. A new parameter, defined as effective aspect ratio, was used to indicate the load-transfer efficiency of misaligned reinforcement. The effective aspect ratio was formulated as a function of aspect ratio and misorientation angle of reinforcement in MMC. A probability density function of misorientation distribution was used to estimate the strengthening effect of all misaligned whiskers distributed in the matrix. Considering the contributions of both effective aspect ratio and misorientation distribution on load-transfer efficiency, a generalized shear-lag model was proposed to explain the mechanical anisotropy of discontinuous reinforced MMC.