Fracture characteristics of PEEK at various stress triaxialities.
Fracture characteristics of PEEK at various stress triaxialities.
复制标题
DOI：
10.1016/j.jmbbm.2016.07.027
复制
发表时间：
2016-12
影响因子：
3.9
通讯作者：
Fei Chen;S. Gatea;H. Ou;B. Lu;H. Long
中科院分区：
文献类型：
--
作者：
Fei Chen;S. Gatea;H. Ou;B. Lu;H. Long
聚醚醚酮（PEEK）是骨科应用中金属合金的替代品。它具有显著的优点，包括优异的机械性能和无毒。在这项工作中，一组具有不同的切口半径的试样被选择来研究三轴应力状态对PEEK断裂行为的影响。通过扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）的断口分析进一步阐明了断裂的微观机制。在不同的应力三轴度下，确定了不同的断裂模式。此外，还对PEEK试样中夹杂物的尺寸、化学成分等微观结构特征进行了分析测定。进行有限元模拟，以评估所观察到的断裂特征与不同的应力三轴度的相关性。
Polyether-ether-ketone (PEEK) is an alternative to metal alloys in orthopaedic applications. It gives significant advantages including excellent mechanical properties and non-toxicity. In this work, a set of specimens with different notched radii were selected to examine the effect of triaxial state of stress on the fracture behavior of PEEK. Fractographic analysis via scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) further elucidated the fracture micromechanisms. Distinct fracture patterns were identified under different stress triaxialities. In addition, the microstructural inclusion properties in PEEK specimen such as inclusion size and chemical composition were analysed and determined. Finite element simulations were carried out to evaluate the correlation of observed fracture characteristics with different stress triaxialities.