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首页> 外文期刊>Acta biomaterialia >Hydration and radiation effects on the residual stress state of cortical bone
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Hydration and radiation effects on the residual stress state of cortical bone

机译：水化和辐射对皮质骨残余应力状态的影响

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摘要

The change in the biaxial residual stress state of hydroxyapatite crystals and collagen fibrillar structure in sections of bovine cortical bone has been investigated as a function of dehydration and radiation dose using combined small- and wide-angle X-ray scattering. It is shown that dehydration of the bone has a pronounced effect on the residual stress state of the crystalline phase, while the impact of radiation damage alone is less dramatic. In the initial hydrated state, a biaxial compressive stress of approximately -150 MPa along the bone axis exists in the hydroxyapatite crystals. As water evaporates from the bone material, the stress state moves to a tensile state of approximately 100 MPa. The collagen fibrillar structure is initially in a tensile residual stress state when the bone is hydrated and the state increases in magnitude slightly with dehydration. Radiation dose in continually hydrated samples also reduces the initial biaxial compressive stress magnitude in the hydroxyapatite phase; however, the stress remains compressive. Radiation exposure alone does not appear to affect the stress state of the collagen fibrillar structure.
机译：使用小角度和广角X射线散射研究了牛皮质骨截面中羟基磷灰石晶体和胶原纤维结构的双轴残余应力状态的变化与脱水和辐射剂量的关系。结果表明，骨骼的脱水对晶相的残余应力状态具有明显的影响，而仅辐射损伤的影响较小。在初始水合状态下，羟基磷灰石晶体中存在沿骨轴的大约-150 MPa的双轴压缩应力。当水从骨材料中蒸发时，应力状态移至大约100 MPa的拉伸状态。当骨被水合时，胶原原纤维结构最初处于拉伸残余应力状态，并且随着脱水该状态在大小上略有增加。连续水合样品中的辐射剂量也降低了羟基磷灰石相的初始双轴压缩应力强度;但是，应力仍然是压缩的。单独的辐射暴露似乎不会影响胶原纤维结构的应力状态。

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