Evaluation of Time-Dependent Fracture Mechanics Parameters of a Moving Crack in a Viscoelastic Strip
Evaluation of Time-Dependent Fracture Mechanics Parameters of a Moving Crack in a Viscoelastic Strip
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粘弹性条中移动裂纹的时变断裂力学参数评估
DOI：
10.1299/jsmea.42.624
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Takashi
中科院分区：
文献类型：
--
作者：
S. Yoneyama;K. Ogawa;Akihiro Misawa;M. Takashi
本文研究了粘弹性带中运动裂纹尖端的时变应力场和裂纹扩展阻力。本文采用光粘弹性技术研究了裂纹尖端随时间变化的应力状态。对于条纹图案分析，一种新的技术，使用椭圆偏振的白色光，它可以确定isochromatic和等倾参数，同时从一个单一的采集获得的彩色图像，应用。利用基于最小二乘法的方法计算了线性粘弹性材料的时变应力强度因子K * I。结果表明，建议的裂纹扩展阻力K* IC可以被认为是单调递增载荷下的材料的特征属性。
The present work studies time-dependent stress fields around a moving crack tip in a viscoelastic strip and crack extension resistance. Photoviscoelastic technique is employed for the evaluation of the time-dependent stress state around a crack tip. For the fringe pattern analysis, a new technique using an elliptically polarized white light, which can determine isochromatic and isoclinic parameters simultaneously from a colored image obtained by a single acquisition, is applied. The time-dependent stress intensity factor K * I which is extended for linearly viscoelastic materials is evaluated using a method based on least-squares. The results show that the proposed crack extension resistance K* IC may be considered as a characteristic property of the material under monotonically increasing load.