Viscous flow of aligned composites
Viscous flow of aligned composites
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定向复合材料的粘性流动
DOI：
10.1007/bf00549556
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发表时间：
1972
影响因子：
4.5
通讯作者：
D. Mclean
中科院分区：
文献类型：
--
作者：
D. Mclean
的情况下，被认为是一个对齐的复合材料进行拉伸蠕变的方向上的纤维。几何论证表明，复合材料中的剪应变是无支撑基体的1/2倍，其中1/2是纤维间空间的纵横比。剪切应力放大（l/2s）1/n倍，其中为基体蠕变定律中的指数。因此，能量消耗率是Vm（1/2s）1+1/n倍，因此复合材料的拉伸流动阻力也是如此（Vm是基体的体积分数）。因此，流动阻力的潜在增加是巨大的。然而，计算出的纤维端部应力与纤维直径成正比，并且可能大到足以引发断裂，除非纤维非常细（例如1μm直径）。拉伸载荷在基体和纤维之间大致相等地分配，而与体积分数无关。
The case is considered of an aligned composite subjected to tensile creep in the direction of the fibres. A geometrical argument shows that shear strain in the composite is amplifiedl/2stimes compared with unsupported matrix, wherel/2s∼ aspect ratio of the inter-fibre spaces. The shear stress is amplified (l/2s)1/ntimes, wherenis the exponent in the matrix creep law. Consequently the rate of energy expenditure is amplifiedVm(1/2s)1+1/ntimes, as is therefore the tensile flow resistance of the composite (Vmis the volume fraction of matrix). The potential increase in flow resistance is thus enormous. However, the fibre end-stress, which is calculated, ∝ fibre diameter, and may be large enough to initiate rupture unless the fibres are very thin (e.g. 1μm diameter). The tensile load is roughly equally divided between matrix and fibres irrespective of volume fractions.