Effects of Fatigue Damage on the Microscopic Modulus of Cortical Bone Using Nanoindentation.
Effects of Fatigue Damage on the Microscopic Modulus of Cortical Bone Using Nanoindentation.
复制标题
纳米压入法研究疲劳损伤对皮质骨微观模量的影响。
DOI:
10.3390/ma14123252
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发表时间:
2021-06-12
期刊:
影响因子:
--
通讯作者:
Qu C
中科院分区:
文献类型:
--
作者:
Meng X;Qu C;Fu D;Qu C
Alterations to the bone structure from cycle loadings can undermine its damage resistance at multiple scales. The accumulation of fatigue damage in a bone is commonly characterized by the reduction in the elastic modulus. In this study, nano-indentation was used for investigating microscopic damage evolution of bovine tibia samples subjected to fatigue loading. Indentation tests were conducted in the same 60 μm × 120 μm area with different degrees of damage, including fracture, and the evolution of reduced modulus was observed. The results showed that bone’s reduced modulus decreased significantly during the initial 40% of the life fraction, whereas it proceeded slowly during the remaining period. As the size of the residual indentations was about 4 μm in length, the degradation of bone’s reduced modulus reflected the accumulation of fatigue damage at smaller scales.
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