Notch brittleness of ductile glassy polymers under plane strain
Notch brittleness of ductile glassy polymers under plane strain
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DOI：
10.1007/bf00550632
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发表时间：
1980-08
影响因子：
4.5
通讯作者：
I. Narisawa;M. Ishikawa;H. Ogawa
中科院分区：
文献类型：
--
作者：
I. Narisawa;M. Ishikawa;H. Ogawa
本文研究了韧性玻璃态聚碳酸酯、聚氯乙烯和聚甲基丙烯酸甲酯缺口棒在不同应变率下的平面应变拉伸脆性断裂行为。断口形貌观察表明，盘状银纹在塑性区尖端形核，并从缺口根部扩展。修正的滑移线理论使屈服准则受静水应力分量的影响，允许根据断裂起源位置的知识计算在静水应力最高的弹塑性边界处的应力分量。对数据的分析得出结论，Orowan的缺口脆性分析是适当的。
The brittle fracture behaviour of ductile glassy polycarbonate, poly(vinyl chloride) and poly(methyl methacrylate) notched bars subjected to plane strain tension has been studied at varying strain rates. Morphological observations of thin sections and fracture surfaces revealed that a disc-type craze was nucleated at the tip of the plastic zone which spread from the notch root. A slip-line theory modified so that the yield criterion is influenced by a hydrostatic stress component allows the calculation of the stress components at the elastic-plastic boundary, where the hydrostatic stress is highest, from the knowledge of the location of the fracture origin. An analysis of the data resulted in the conclusion that Orowan's analysis for notch brittleness is appropriate.