Ratcheting behavior of UHMWPE reinforced by carbon nanofibers (CNF) and hydroxyapatite (HA): Experiment and simulation
Ratcheting behavior of UHMWPE reinforced by carbon nanofibers (CNF) and hydroxyapatite (HA): Experiment and simulation
复制标题
碳纳米纤维（CNF）和羟基磷灰石（HA）增强UHMWPE的棘轮行为：实验与模拟
DOI：
10.1016/j.jmbbm.2018.08.022
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发表时间：
2018
影响因子：
3.9
通讯作者：
Zhengyuan Song
中科院分区：
文献类型：
--
作者：
Jianhai Wang;Hong Gao;Lilan Gao;Yun Cui;Zhengyuan Song
通过单轴拉伸试验研究不同改性条件下超高分子量聚乙烯（UHMWPE）的力学性能。结果发现，不同的改性条件对UHMWPE的力学性能影响较大。随后，在室温应力控制循环拉伸条件下观察了UHMWPE/CNF和UHMWPE/HA复合材料的单轴棘轮行为。研究了复合材料单轴棘轮对平均应力、应力幅、应力率和纳米材料含量的依赖性。结果表明，两种复合材料的棘轮应变及其速率随着平均应力和应力幅的增加而增大，而随着应力速率和纳米材料含量的增加而减小。此外，还发现UHMWPE/HA复合材料的棘轮应变比UHMWPE/CNF复合材料更为显着。提出了一种新的粘塑性本构模型来描述 UHMWPE 复合材料的棘轮行为。在该模型中，采用了新的粘度函数和改进的运动硬化定律。仿真与实验结果的比较表明，仿真结果与实验结果吻合较好。
Uniaxial tensile tests were performed to investigate the mechanical properties of the ultra-high molecular weight polyethylene (UHMWPE) with different modification conditions. It was found that the different modification conditions have great influence on the mechanical properties of the UHMWPE. Subsequently, the uniaxial ratcheting behaviors of the UHMWPE/CNF and UHMWPE/HA composite materials were observed under the stress-controlled cyclic tensile condition at room temperature. The dependence of uniaxial ratcheting of composite materials on the mean stress, stress amplitude, stress rate and nano-material content was investigated. The results show that the ratcheting strain and its rate of the two composite materials increase as the mean stress and stress amplitude increase, however, the ratcheting strain and its rate decrease with the increase of the stress rate and nano-material content. Furthermore, it is found that the ratcheting strain of the UHMWPE/HA composite material is more remarkable than that of the UHMWPE/CNF composite material. A new viscoplastic constitutive model is proposed to describe the ratcheting behavior of the UHMWPE composite materials. In this model, a new viscosity function and modified kinematic hardening law were employed. Comparison of simulation and experimental results shows that the simulations are in good agreement with the experimental results.