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首页> 外文期刊>Journal of Biomechanics >Prediction of microdamage formation using a mineral-collagen composite model of bone.
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Prediction of microdamage formation using a mineral-collagen composite model of bone.

机译：使用骨骼的矿物质-胶原复合模型预测微损伤的形成。

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摘要

Age-related changes in bone quality are mainly manifested in the reduced toughness. Since the post-yield deformation of bone is realized through microdamage formation (e.g., microcracking and diffuse damage), it is necessary to understand the mechanism of microdamage formation in bone in order to elucidate underlying mechanisms of age-related bone fractures. In this study, a two-dimensional shear lag model was developed to predict stress concentration fields around an initial crack in a mineral-collagen composite. In this model, non-linear elasticity was assumed for the collagen phase, and linear elasticity for the mineral. Based on the pattern of the stress concentration fields, the condition for microdamage formation was discussed. The results of our analyses indicate that: (1) an initial crack formed in mineral phase may cause stress concentration in the adjacent mineral layers; (2) the pattern of stress concentration fields depends not only on the spatial but also mechanical properties of the collagen and mineral phases; (3) the pattern of the stress concentration fields could determine either coalescence or scattering of nano cracks around the initial crack.
机译：与年龄相关的骨骼质量变化主要表现为韧性降低。由于骨骼的屈服后变形是通过微损伤形成（例如，微裂纹和弥散性损伤）实现的，因此有必要了解骨骼中微损伤形成的机制，以阐明与年龄相关的骨折的潜在机制。在这项研究中，建立了二维剪切滞后模型来预测矿物-胶原复合材料中初始裂纹周围的应力集中场。在该模型中，假定胶原相具有非线性弹性，而矿物质具有线性弹性。根据应力集中场的规律，讨论了微损伤形成的条件。我们的分析结果表明：（1）在矿物相中形成的初始裂纹可能导致应力在相邻的矿物层中集中; （2）应力集中场的模式不仅取决于胶原蛋白和矿物质相的空间，而且还取决于其力学性能; （3）应力集中场的模式可以决定纳米裂纹在初始裂纹周围的聚结或散布。

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