Murakami Takashi, Iijima Masahiro, Muguruma Takeshi, Yano Fumiaki, Kawashima Isao, Mizoguchi Itaru
Analytical Applications Department, Kyoto Application Development Center, Shimadzu Corporation.
Dent Mater J. 2015;34(2):189-95. doi: 10.4012/dmj.2014-012. Epub 2015 Feb 24.
This study investigated high-cycle fatigue behavior in three β-Ti wires (TMA, Resolve, Gummetal). Fatigue was evaluated using a static three-point bending test and a high-cycle fatigue test with a three-point bending mode. The surfaces of fractured wires were observed with scanning electron microscopy, and the post-fatigue crystal structures were determined by micro-X-ray diffraction. The Gummetal wire exhibited the lowest elastic modulus, bending strength and fatigue limit, and exhibited the highest resilience of the three types of wire studied. However, no difference in the number of cycles to failure was observed among the three types of wire. The fatigue crack propagation and rapid propagation regions of all wires contained single-phase β-Ti. The elastic modulus and bending strength influenced the fatigue limit, although these properties did not affect the number of cycles to fracture. The three types of β-Ti wires exhibited similar risks of wire fracture.
本研究调查了三种β钛丝（TMA、Resolve、Gummetal）的高周疲劳行为。使用静态三点弯曲试验和三点弯曲模式的高周疲劳试验来评估疲劳性能。用扫描电子显微镜观察断裂丝的表面，并用微X射线衍射确定疲劳后的晶体结构。Gummetal丝的弹性模量、弯曲强度和疲劳极限最低，在所研究的三种丝中表现出最高的回弹性。然而，在三种丝之间未观察到失效循环次数的差异。所有丝的疲劳裂纹扩展和快速扩展区域均包含单相β钛。弹性模量和弯曲强度影响疲劳极限，尽管这些性能不影响断裂循环次数。三种β钛丝表现出相似的丝断裂风险。
