An augmented hybrid constitutive model for simulation of unloading and cyclic loading behavior of conventional and highly crosslinked UHMWPE
An augmented hybrid constitutive model for simulation of unloading and cyclic loading behavior of conventional and highly crosslinked UHMWPE
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DOI：
10.1016/j.biomaterials.2003.08.065
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发表时间：
2004-05-01
期刊：
影响因子：
14
通讯作者：
Kurtz, SM
中科院分区：
文献类型：
--
作者：
Bergström, JS;Rimnac, CM;Kurtz, SM
超高分子量聚乙烯（UHMWPE）广泛用于全关节置换术。磨损、疲劳和断裂限制了UHMWPE部件的使用寿命。因此，在关节置换的背景下，在微观和宏观尺度上，已经做出了大量努力来了解UHMWPE的失效和磨损机制。我们之前已经开发、校准和验证了一种本构模型，用于预测传统和高交联UHMWPE在多轴载荷条件下的载荷响应（Biomaterials 24（2003）1365）。然而，为了模拟骨科组件的体内变化，准确模拟卸载行为与工作循环的加载阶段同样重要。因此，在本研究中，我们重点了解和预测UHMWPE在单轴卸载过程中的力学响应。具体而言，我们已经增强了我们先前开发的本构模型，以便在循环加载期间准确预测常规和高交联UHMWPE的卸载行为。结果表明，我们的增强混合模型准确地捕捉到实验观察到的特性，包括单轴循环加载，大应变拉伸，速率效应，和多轴变形的历史。增强的混合本构模型将在未来的UHMWPE疲劳、失效和磨损研究中用作关键构件。(C)2003爱思唯尔有限公司。保留所有权利。
Ultra-high molecular weight polyethylene (UHMWPE) is extensively used in total joint replacements. Wear, fatigue, and fracture have limited the longevity of UHMWPE components. For this reason, significant effort has been directed towards understanding the failure and wear mechanisms of UHMWPE, both at a micro-scale and a macro-scale, within the context of joint replacements. We have previously developed, calibrated, and validated a constitutive model for predicting the loading response of conventional and highly crosslinked UHMWPE under multiaxial loading conditions (Biomaterials 24 (2003) 1365). However, to simulate in vivo changes to orthopedic components, accurate simulation of unloading behavior is of equal importance to the loading phase of the duty cycle. Consequently, in this study we have focused on understanding and predicting the mechanical response of UHMWPE during uniaxial unloading. Specifically, we have augmented our previously developed constitutive model to also allow for accurate predictions of the unloading behavior of conventional and highly crosslinked UHMWPE during cyclic loading. It is shown that our augmented hybrid model accurately captures the experimentally observed characteristics, including uniaxial cyclic loading, large strain tension, rate-effects, and multiaxial deformation histories. The augmented hybrid constitutive model will be used as a critical building block in future studies of fatigue, failure, and wear of UHMWPE. (C) 2003 Elsevier Ltd. All rights reserved.