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首页> 外文期刊>Journal of Biomechanics >CRACK GROWTH RESISTANCE IN CORTICAL BONE - CONCEPT OF MICROCRACK TOUGHENING
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CRACK GROWTH RESISTANCE IN CORTICAL BONE - CONCEPT OF MICROCRACK TOUGHENING

机译：骨皮质的抗龟裂性-微裂纹强化的概念

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The role of microcracking in cortical bone as a toughening mechanism has been investigated in conjunction with the variation in fracture toughness with crack length. Fracture toughness tests were conducted on miniaturised compact tension specimens made from human and bovine cortical bone and the resultant microstructural damage, present in the form of microcracking on the surface, was analysed around the main propagating crack. Ir was found that the fracture toughness (K-c) and the cumulative number of microcracks increased linearly with crack extension in human and bovine cortical bone, although both K-c and number of microcracks were considerably higher in the latter case. Based on these results, a mechanism, derived from the resistance (R) curve concept developed for microcracking brittle solids, is proposed to explain the fracture of cortical bone, with microcracking distributed between a frontal process zone and a significant process zone wake. Evidence to support this mechanism is given from the existing bone literature, detailed scanning electron microscopical observations and the distribution of microcracks in the process zone wake. (C) 1997 Elsevier Science Ltd. [References: 35]
机译：结合裂纹长度随断裂韧性的变化，研究了皮质骨微裂纹作为增韧机理的作用。在由人和牛的皮质骨制成的小型致密拉伸试样上进行了断裂韧性测试，并分析了在主要扩展裂纹周围表面上以微裂纹形式存在的最终微结构损伤。 Ir发现，人和牛皮质骨的断裂韧性（K-c）和微裂纹的累积数量随裂纹扩展而线性增加，尽管在后一种情况下，K-c和微裂纹的数量均明显更高。基于这些结果，提出了一种从电阻（R）曲线概念发展而来的机制，该机制用于微裂纹脆性固体，用于解释皮质骨的骨折，其中微裂纹分布在额叶过程区和重要的过程区尾流之间。现有的骨骼文献，详细的扫描电子显微镜观察以及过程区尾流中微裂纹的分布都提供了支持该机制的证据。 （C）1997 Elsevier Science Ltd. [参考：35]

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