Measurements of strain fields around crack tips under proportional and non-proportional mixed-mode fatigue loading
Measurements of strain fields around crack tips under proportional and non-proportional mixed-mode fatigue loading
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DOI：
10.1016/j.ijfatigue.2016.01.018
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发表时间：
2016-08-01
影响因子：
6
通讯作者：
Vormwald, Michael
中科院分区：
文献类型：
--
作者：
Hos, Yigiter;Freire, Jose L. F.;Vormwald, Michael
对于薄壁管在拉伸和扭转下进行的一系列疲劳实验中检查的各种配置，测量了实验结果——裂纹路径、裂纹扩展寿命、近裂纹尖端变形和裂纹闭合。实验研究中使用了光学检查和数字图像相关技术。确定了裂纹张开和闭合载荷。在计算应力强度因子的第一种方法中，机械材料行为被假定为线弹性。循环变形的非线性性质已通过实验确定，以便将来在循环塑性模型中使用。 (C) 2016 Elsevier Ltd. 保留所有权利。
For various configurations examined in a series of fatigue experiments on thin-walled tubes under tension and torsion, the experimental results - crack path, crack growth life, near crack tip deformations, and crack closure - are measured. Optical inspections and digital image correlation technique were used in the experimental investigation. Crack opening and closure loads were determined. The mechanical material behavior has been assumed as linear elastic in a first approach for calculating stress intensity factors. The non-linear nature of the cyclic deformation has been determined experimentally for future use in a cyclic plasticity model. (C) 2016 Elsevier Ltd. All rights reserved.