Abstract：
The potential of using specimens with a double-semicircular-notched configuration for performing tensile tests of orthodontic thermoplastic aligner materials was explored. Unnotched and double-semicircular-notched specimens were loaded in tension using a universal testing machine to determine their tensile strength, while finite element analysis (FEA) and digital image correlation (DIC) were used to estimate stress and strain, respectively. The shape did affect the tensile strength, demonstrating the importance of unifying the form of the specimen. During the elastic phase under tension, double-semicircular-notched specimens showed similar behavior to unnotched specimens. However, great variance was observed in the strain patterns of the unnotched specimens, which exhibited greater chance of end-failure, while the strain patterns of the double-semicircular-notched specimens showed uniformity. Considerable agreement between the theoretical (FEA) and practical models (DIC) further confirmed the validity of the double-semicircular-notched models.
摘要：
探索了使用具有双半圆形缺口配置的标本进行正畸热塑性矫正器材料拉伸测试的潜力。用万能试验机对无缺口和双半圆形缺口试样进行拉伸加载,测定其拉伸强度,而有限元分析（FEA）和数字图像相关（DIC）用于估计应力和应变，分别。形状确实影响了抗拉强度，证明了统一标本形式的重要性。在拉伸下的弹性阶段，双半圆形缺口标本表现出与无缺口标本相似的行为。然而,在无缺口标本的应变模式中观察到很大的差异，表现出更大的最终失败的可能性，而双半圆形缺口标本的应变模式显示出均匀性。理论模型（FEA）和实际模型（DIC）之间的相当大的一致性进一步证实了双半圆形缺口模型的有效性。
