Local and non-local modeling aspects of three-dimensional cracks growth initiation

Local and non-local modeling aspects of three-dimensional cracks growth initiation
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三维裂纹扩展的局部和非局部建模

DOI:
10.1007/s10704-020-00424-8
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发表时间:
2020
影响因子:
2.5
通讯作者:
Rodin, Gregory J.
Rodin, Gregory J.
中科院分区:
工程技术3区
文献类型:
--
作者:
Rodin, Gregory J.

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在假设裂纹前缘保持光滑的情况下,研究了三维裂纹扩展起裂。两个重要的建模问题,具体到三维而不是二维裂缝,被解决。首先,在裂缝前缘的每一点上,速度和构形力都是位于局部法平面上的二维矢量;这使得人们可以将任何二维裂纹扩展准则推广到三维。其次,提出了一个简单的介观模型来解释沿前沿的非定域性。该模型消除了应用于三维裂纹的基本模型中普遍存在的病理生长模式。此外,该模型使用简单,因为它只依赖于标准裂缝特性。
Three-dimensional crack growth initiation is examined under the assumption that the crack front remains smooth. Two important modeling issues, specific to three-dimensional rather than two-dimensional cracks, are addressed. First, it is established that, at each point along the crack front, the velocity and configurational force are two-dimensional vectors, lying in the local normal plane. This allows one to generalize any two-dimensional crack growth criterion to three dimensions. Second, a simple mesoscopic model to account for along-the-front non-locality is proposed. This model eliminates pathological growth patterns ubiquitous to basic models applied to three-dimensional cracks. Further, the model is straightforward to use as it relies on standard fracture properties only.
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期刊:
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