MICROMECHANICS ANALYSIS OF SPACE SIMULATED THERMAL-STRESSES IN COMPOSITES .1. THEORY AND UNIDIRECTIONAL LAMINATES
MICROMECHANICS ANALYSIS OF SPACE SIMULATED THERMAL-STRESSES IN COMPOSITES .1. THEORY AND UNIDIRECTIONAL LAMINATES
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DOI：
10.1177/073168449101000506
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发表时间：
1991-09-01
影响因子：
3.1
通讯作者：
GRIFFIN, OH
中科院分区：
文献类型：
--
作者：
BOWLES, DE;GRIFFIN, OH
采用细观力学方法研究了连续纤维增强聚合物基复合材料在航天器工作温度下纤维和基体的热致应力场。对周期性纤维阵列的有限元应力分析结果与几种纤维/基体材料复合圆柱体模型的封闭解进行了比较。研究了微观结构几何形状、组分性质和纤维体积分数对其性能的影响。研究结果表明，复合材料的假设微观结构几何形状（即复合材料的圆柱体、正方形或六边形阵列）确实影响热致应力的分布和大小。结果表明，基体应力对纤维性能的影响不大。基体应力绝对值随着纤维体积分数V(f)的增大而增大。采用全局/局部分析来近似高V(f)局部区域的应力，受较低全局V(f)的约束。
A micromechanics approach was utilized to investigate the thermally induced stress fields developed in the fiber and matrix of continuous fiber reinforced polymer matrix composites at cold temperatures typical of spacecraft operating temperatures. Results from a finite element stress analysis of a periodic array of fibers were compared to the closed-form solution of the composite cylinder model for several fiber/matrix materials. The influence of microstructural geometry, constituent properties, and fiber volume fraction were investigated. The results of this investigation showed that the assumed microstructural geometry of the composite (i.e., composite cylinder, square or hexagonal array) did affect the distributions and magnitudes of thermally induced stresses. The matrix stresses were shown not to be strong functions of the fiber properties. Matrix stresses increased in absolute value with increasing fiber volume fraction, V(f). A global/local analysis was used to approximate the stresses in localized regions of high V(f), constrained by a lower global V(f).