Ⅲ型裂纹裂尖应力场的内聚力模型
发布时间：2019-05-24 03:49
【摘要】：针对幂指数硬化材料,在小范围的屈服条件下,建立了Ⅲ型裂纹的内聚力模型,获得了内聚区和塑性区中的应力-应变场及内聚区中的内聚力和张开位移的本构关系.结果表明:对于中等硬度的材料,如果内聚力的峰值小于2.5倍的屈服应力,那么内聚力对塑性区中的应力分布起决定性的作用,传统的弹塑性断裂力学方法和内聚力方法之间存在着差别;当牵引力的峰值变为无穷大时,无论有否内聚力,应力分布都会趋于收敛.
[Abstract]:For power exponential hardened materials, the cohesion model of type III crack is established under a small range of yield conditions, and the stress-strain field in the cohesion zone and the stress-strain field in the plastic zone, as well as the constitutive relations between the cohesion force and the opening displacement in the cohesion zone are obtained. The results show that if the peak value of cohesion is less than 2.5 times yield stress, the cohesion plays a decisive role in the stress distribution in the plastic zone. There are differences between the traditional elastic-plastic fracture mechanics method and the cohesion method. When the peak value of traction becomes infinite, the stress distribution tends to converge with or without cohesion.
【作者单位】： 兰州理工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51665028)
【分类号】：O346.1
本文编号：2484536
[Abstract]:For power exponential hardened materials, the cohesion model of type III crack is established under a small range of yield conditions, and the stress-strain field in the cohesion zone and the stress-strain field in the plastic zone, as well as the constitutive relations between the cohesion force and the opening displacement in the cohesion zone are obtained. The results show that if the peak value of cohesion is less than 2.5 times yield stress, the cohesion plays a decisive role in the stress distribution in the plastic zone. There are differences between the traditional elastic-plastic fracture mechanics method and the cohesion method. When the peak value of traction becomes infinite, the stress distribution tends to converge with or without cohesion.
【作者单位】： 兰州理工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51665028)
【分类号】：O346.1
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