Department of Oral and Maxillofacial Radiology, Tokyo Dental College.
Department of Mechanical Engineering, Keio University.
Dent Mater J. 2022 Apr 1;41(2):286-294. doi: 10.4012/dmj.2021-174. Epub 2022 Mar 4.
The present study was aimed to develop a probabilistic finite element method (FEM) that predicts the variability in the fatigue life of additively manufactured clasp so that it can be used as a virtual test in the design phase before manufacturing. Titanium alloy (Ti-6Al-4V) clasp with integrated chucking part, which was designed for experimental fatigue test to validate the computational method, was investigated. To predict the lower bound, an initial spherical defect was assumed in the region where stress concentration was predicted. The Smith-Watson-Topper (SWT) method, Bäumel & Seeger rule, elasto-plastic FEM, and zooming FEM were used. The influence of assumed initial defect on the fatigue life was significant, and the large variability in the fatigue life was predicted. This study demonstrated that the proposed practical computational method can simulate the large variability in the fatigue life of titanium alloy clasp, which is useful in its design before manufacturing.
本研究旨在开发一种概率有限元方法（FEM），以预测增材制造卡爪的疲劳寿命变化，以便在制造前的设计阶段用作虚拟测试。研究了带有集成卡盘部分的钛合金（Ti-6Al-4V）卡爪，该卡爪设计用于实验疲劳测试以验证计算方法。为了预测下限，在预测的应力集中区域中假设存在初始球形缺陷。使用了 Smith-Watson-Topper（SWT）方法、Bäumel 和 Seeger 规则、弹塑性有限元法和缩放有限元法。假设初始缺陷对疲劳寿命的影响显著，并且预测了疲劳寿命的较大变化。本研究表明，所提出的实用计算方法可以模拟钛合金卡爪疲劳寿命的较大变化，这对于制造前的设计很有用。
