Small scale fracture mechanics of ductile materials: Advantage of fatigue precracks and comparison of J-integral evaluations
Small scale fracture mechanics of ductile materials: Advantage of fatigue precracks and comparison of J-integral evaluations
复制标题
DOI：
10.1016/j.mtla.2018.09.011
复制
发表时间：
2018-12-01
期刊：
影响因子：
3.4
通讯作者：
Motz, Christian
中科院分区：
文献类型：
--
作者：
Gruenewald, Patrick;Schaefer, Florian;Motz, Christian
在小尺度下进行断裂力学并将其行为外推到更大的长度尺度是分析有限调查量的材料和部件的有力工具。这种技术的一个关键要求是一方面在这些尺度上测试方法的有效性，而且测得的断裂力学量与试样尺寸无关。为了检查断裂韧性是否与尺寸有关，我们在两个长度尺度上评估了韧性合金的断裂韧性。此外，我们还研究了疲劳预裂纹的影响相比，离子切割缺口，广泛使用的微尺度。
Conducting fracture mechanics at small scales and extrapolating the behavior to larger length scales is a powerful tool to analyze materials and components with limited volumes of investigation. A critical requirement for this technique is the validity of the test methods at these scales on one hand, but also that the measured fracture mechanical quantities are independent of specimen size. To check whether the fracture toughness is size dependent we evaluated the fracture toughness of a ductile alloy at two length scales. Furthermore, we also investigated the influence of fatigue precracks compared to ion cut notches that are widely used at the micro scale.