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用光学显微镜观察了交联有机玻璃断面上的肋状形态。发现断面形态、裂纹路径以及肋状区裂端簇射状银纹群之间有直接联系。每一肋条由一细砂带和一粗破带构成。前者对应于裂端楔形银纹/固体聚合物之间界面的剥离;后者对应于剥离后锐化裂端银纹群之间的剪切;这两个交替过程可以用“滑-粘”模型来解释。在不稳定肋状区发现到裂纹在霉纹区和肋状区的扩展机理是可以相互转化的。
The ribbed morphology on the cross-section of the plexiglass was observed with an optical microscope. It is found that there is a direct relationship between the morphology of the cross section, the crack path and the cluster of banded silver fringes in the ribbed area. Each rib consists of a fine sand belt and a coarse broken belt. The former corresponds to the debonding of the interface between the wedge-shaped silver / solid polymer at the crack tip; the latter corresponds to the shearing of the silver clusters at the sharpened crack tip after delamination; the two alternating processes can be modeled using a “slip-tack” To explain. In unstable ribbed areas, it is found that the propagation mechanism of cracks in moldy and ribbed areas can be interconverted.