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首页> 外文期刊>Key Engineering Materials >Development of Damage Zone by Scattered Cracking around Crack Tips in Brittle Solids under Compression
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Development of Damage Zone by Scattered Cracking around Crack Tips in Brittle Solids under Compression

机译：压缩条件下脆性固体中裂纹尖端周围散布裂纹的破坏区发展

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摘要

Compression induced formation of a damage zone, which would result in a shear fault in brittle solids is studied. In a compression test of flawed PMMA, an apparent damage zone composed of large number of scattered cracks, which have no intersection but exist closely with each other, is experienced. The damage zone first appears in a vicinity of tips of artificial flaw and then extends gradually with increase of applied compression. The direction of extension of damage zone is observed to incline about 30° from the axis of principal compression. A mechanism of the extension of damage zone with increase of applied compression is discussed using a scattered cracking model. It was found that each crack composing the damage zone has a possibility to open due to crack-to-crack interaction and a localized tensile stress appears both inside and outside of the damage zone. The localized tension appeared in the interior of the damage zone may increase crack density, while that of appeared in the exterior of the damage zone could bring an extension of the damage zone.
机译：研究了压缩引起的损伤区域的形成，这将导致脆性固体的剪切断裂。在有缺陷的PMMA的压缩试验中，会出现由大量分散的裂纹组成的表观损坏区域，这些裂纹没有相交但彼此紧密地存在。损伤区域首先出现在人造缺陷尖端附近，然后随着施加的压缩的增加而逐渐扩展。观察到损坏区域的延伸方向从主压缩轴倾斜约30°。利用分散裂纹模型讨论了随着施加压缩的增加破坏区域扩展的机理。已经发现，由于裂纹到裂纹的相互作用，组成损伤区域的每个裂纹都有可能打开，并且在损伤区域的内部和外部都出现局部拉伸应力。出现在损伤区内部的局部张力可能会增加裂纹密度，而出现在损伤区外部的局部张力可能会使损伤区扩展。

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