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首页> 外文期刊>JSME International Journal. Series A >Evaluation of Time-Dependent Fracture Mechanics Parameters of a Moving Crack in a Viscoelastic Strip
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Evaluation of Time-Dependent Fracture Mechanics Parameters of a Moving Crack in a Viscoelastic Strip

机译:粘弹性带中运动裂纹的时变断裂力学参数评估

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摘要

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 by considered as a characteristic property of the material under monotonically increasing load.
机译:目前的工作研究了粘弹性带中运动的裂纹尖端周围随时间变化的应力场和抗裂纹扩展性。光粘弹性技术用于评估裂纹尖端周围随时间变化的应力状态。对于条纹图案分析,应用了一种使用椭圆偏振白光的新技术,该技术可以从通过一次采集获得的彩色图像中同时确定等色和等斜参数。使用基于最小二乘法的方法来评估针对线性粘弹性材料扩展的随时间变化的应力强度因子K_I。结果表明,所提出的抗裂纹扩展性K_IC可以认为是材料在单调增加的载荷下的特性。

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