Spatial stress distribution analysis by thermoelastic stress measurement and evaluation of effect of stress concentration on durability of various orthopedic implant devices
Spatial stress distribution analysis by thermoelastic stress measurement and evaluation of effect of stress concentration on durability of various orthopedic implant devices
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DOI：
10.1016/j.msec.2017.02.014
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发表时间：
2017-06-01
影响因子：
7.9
通讯作者：
Ogawa, Atsushi
中科院分区：
文献类型：
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作者：
Okazaki, Yoshimitsu;Ishii, Daisuke;Ogawa, Atsushi
为了开发高耐用的装置，我们通过热弹性应力测量和评估应力集中的影响，研究了可植入原材料的热弹性常数和表面应力分布对不同类型植入装置耐久性的影响。根据弯矩动态计算表面应力，发现器件截面的模数与通过热弹应力测量得到的表面应力一致。根据最大载荷-循环次数数据(L-N数据)计算的各种类型的接骨板和加压髋关节螺钉(CHS)的耐久性极限与原材料的缺口疲劳强度接近。通过比较人工髋柄的L-N数据和原料的S-N曲线，估算了人工髋柄表面的浓缩系数。通过热弹性应力测量对耐久性进行动态分析，有助于在医疗器械设计中选择最坏的情况(产品劣化到最严重的状态)。(C)2017爱思唯尔B.V.保留所有权利。
Toward the development of highly durable devices, we investigated the effect of the thermoelastic constants of implantable raw metals and the surface stress distribution on the durability of various types of implant device by thermoelastic stress measurement and by evaluating the effect of the stress concentration. Surface stress was dynamically calculated from the bending moment, and the modulus of a section of a device was found to be consistent with the surface stress obtained by thermoelastic stress measurement. The durability limits of various types of bone plate and compression hip screw (CHS) calculated from maximum load vs number of cycles data (L-N data) were close to the notch fatigue strength of the raw material. The concentration factor of an artificial hip stem surface was estimated by comparing the L-N data of the stem and the S-N curve of the raw material. The dynamic analysis of durability by thermoelastic stress measurement is useful for selecting the worst case (a product deteriorating to the most severe state) in medical device design. (C) 2017 Elsevier B.V. All rights reserved.