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首页> 外文期刊>Journal of Materials Science >THE EFFECT OF LOAD LEVEL ON THE MECHANISM OF FATIGUE CRACK PROPAGATION IN ABS
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THE EFFECT OF LOAD LEVEL ON THE MECHANISM OF FATIGUE CRACK PROPAGATION IN ABS

机译：载荷水平对ABS疲劳裂纹扩展机理的影响

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The fatigue crack propagation (FCP) mechanism of an ABS was examined under tension-tension loading as a function of load level. The crack was always preceded by a damage zone consisting of assemblies of stress-whitened lines. Crack growth was predominantly through the root damage line, with occasional jumps into neighbouring lines. These jumps occurred most frequently in the medium load level test. Transmission electron microscopy (TEM) analyses showed the damage within the stress-whitened lines to consist of elongated, and occasionally ruptured, rubbery domains at the specimen surface, with the appearance of extensive crazes bridging their interstices toward the mid-thickness. The craze intensity (size and number) increased with decreasing load level. The crazes manifested themselves on the fracture surface as a patch morphology, which was increasingly pervasive with decreasing load level. In the rougher region that followed, ductile tearing of the matrix is believed to be promoted by rubber cavitation a nd the merging of crazes. Normal fatigue striations indicate crack advance by greater fractions of the damage zone length at higher load levels. [References: 23]
机译：研究了拉伸-拉伸载荷与载荷水平之间关系的ABS疲劳裂纹扩展（FCP）机理。裂纹之前总是有一个由应力白线组成的损坏区域。裂纹的增长主要是通过根部损伤线，偶尔会跳入相邻的线。在中等负载水平测试中，这些跳跃最常见。透射电子显微镜（TEM）分析显示，应力致白线内的损坏由试样表面上伸长的，偶而破裂的橡胶状区域组成，并出现了宽大的龟裂，将其缝隙桥接到中间厚度。开裂强度（大小和数量）随着负载水平的降低而增加。裂缝在斑块表面表现为斑块形态，随着载荷水平的降低，这种现象越来越普遍。在随后的较粗糙区域中，据信橡胶空化和裂纹合并促进了基体的延性撕裂。正常的疲劳条纹表明，在更高的载荷水平下，裂纹会以更大的破坏区长度分数来扩展。 [参考：23]

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