ELASTIC RESPONSE OF A LAYERED CYLINDER SUBJECTED TO DIAMETRAL LOADING
ELASTIC RESPONSE OF A LAYERED CYLINDER SUBJECTED TO DIAMETRAL LOADING
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DOI：
10.1016/s0961-9526(09)80002-6
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发表时间：
1994-01-01
期刊：
影响因子：
--
通讯作者：
PINDERA, MJ
中科院分区：
文献类型：
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作者：
DAVISON, TS;WADLEY, HNG;PINDERA, MJ
在一个任意分层的圆柱体进行径向相反的负载产生的弹性应力场进行检查，随后调查钨芯硼和碳芯碳化硅纤维径向压缩试验测量的横向强度。 利用线弹性位移公式和局部/整体刚度矩阵法，在平面应变假设下，求解了由各向同性环形线弹性壳组成的复合材料圆柱壳的应力和位移分量。 结果表明，在径向压缩载荷作用下，陶瓷纤维中碳和钨芯的存在导致芯/外壳界面处的拉应力集中。 这被证明有助于明显的横向强度的损失。 该解决方案还提供了对合金涂层陶瓷纤维的第一阶段固结的深入了解。 升高的环向应力被示出发生在纤维-纤维接触处，这导致屈服系数从均匀合金纤维的屈服系数降低。 因此，当存在陶瓷纤维时，可以在较低的施加载荷下完成固结的屈服机制的启动。
The elastic stress field produced in an arbitrarily layered cylinder subjected to diametrically opposed loads is examined and subsequently employed to investigate the transverse strengths of tungsten-cored boron and carbon-cored silicon carbide fibers measured from diametral compression tests. The displacement formulation of linear elasticity and the local/global stiffness matrix method are used to obtain solutions for stress and displacement components in a composite cylinder consisting of annular linear elastic isotropic shells under the assumption of plane strain. It is found that the presence of the carbon and tungsten cores in the ceramic fibers gives rise to a tensile stress concentration at the core/outer shell interface under diametral compressive loading. This is shown to contribute to a significant loss of apparent transverse strength. The solution also provides insight into first-stage consolidation of alloy-coated ceramic fibers. Elevated hoop stresses are shown to occur at fiber-fiber contacts that result in a reduction in the yield coefficient from that of homogeneous alloy fibers. Thus, the initiation of the yield mechanism of consolidation can be accomplished at lower applied loads when a ceramic fiber is present.