Fracture and fatigue of discontinuously reinforced copper/tungsten composites
Fracture and fatigue of discontinuously reinforced copper/tungsten composites
复制标题
不连续增强铜/钨复合材料的断裂与疲劳
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
S. Ramani
中科院分区：
文献类型：
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作者：
B. Harris;S. Ramani
本文研究了用不同长度的短钨丝增强铜的复合材料的强度、韧性和抗循环裂纹扩展性能，并与用同样方法即真空热压法制造的连续增强复合材料的性能进行了比较。人们已经发现，而连续增强复合材料的疲劳裂纹扩展的阻力是非常相似的连续铝/不锈钢复合材料的其他地方报道，添加短纤维完全改变了断裂模式，没有直接的比较是可能的。实际上，短纤维通过使塑性流动分布而不是局部化来抑制单个裂纹的生长，尽管这些复合材料的强度远低于连续纤维复合材料，但它们仍然具有更大的抗疲劳性。复合材料的断裂韧性被认为简单地来自于基体和纤维塑性流动的单独贡献，并且在含有接近临界长度的纤维的复合材料中，来自于纤维拉出的非常大量的功。
The strength, toughness and resistance to cyclic crack propagation of composites consisting of copper reinforced with short tungsten wires of various lengths have been studied and the results compared with the behaviour of continuously reinforced composites manufactured by the same method, i.e. by vacuum hot-pressing. It has been found that whereas the resistance to fatigue crack growth of continuously reinforced composites is very similar to that of continuous Al/stainless steel composites reported elsewhere, the addition of short fibres completely changes the mode of fracture, and no direct comparisons are possible. In effect, short fibres inhibit single crack growth by causing plastic flow to be distributed rather than localized, and although these composites are much less strong than continuous fibre composites, they nevertheless have much greater fatigue resistance. The fracture toughness of the composites is thought to be derived simply from the separate contributions of matrix and fibre plastic flow and, in composites containing fibres near to the critical length, from the very substantial work of fibre pull-out.