A Model of Cleavage Crack Propagation in a BCC Polycrystalline Solid Based on the Extended Finite Element Method
A Model of Cleavage Crack Propagation in a BCC Polycrystalline Solid Based on the Extended Finite Element Method
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DOI：
10.2139/ssrn.3287444
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Kazuki Shibanuma;Yuta Suzuki;Kazuya Kiriyama;Katsuyuki Suzuki;H. Shirahata
中科院分区：
文献类型：
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作者：
Kazuki Shibanuma;Yuta Suzuki;Kazuya Kiriyama;Katsuyuki Suzuki;H. Shirahata
摘要提出了第一个模拟体心立方(BCC)多晶固体解理裂纹扩展的三维模型。该模型是基于扩展有限元方法建立的。裂纹形状和多晶体的模拟与有限元网格无关。基于局部断裂应力准则，在{100}面上形成解理裂纹面。裂纹扩展通过更新解理面的迭代计算来模拟。使用铁素体-珠光体钢进行了模型验证。结果表明，该模型成功地模拟了复杂的解理裂纹扩展行为，包括局部裂纹扩展方向的包络行为以及主断裂面下大量微裂纹的形成。特别是，解理面方向分布的比较定量地验证了所提出的模型。本研究中提出的模型可能有助于阐明微观结构和解理裂纹扩展阻力之间的关系。
Abstract The first 3D model to simulate cleavage crack propagation in a body center cubic (BCC) polycrystalline solid is presented. The model was developed based on the extended finite element method (XFEM). Crack shape as well as a polycrystal were modeled independently from the finite element mesh. Cleavage crack planes formed on the {100} planes based on the local fracture stress criterion. Crack propagation was simulated by an iterative calculation with updating cleavage planes. Model validations were conducted with experimental fractography using a ferrite-pearlite steel. The results showed that the proposed model successfully simulated complicated cleavage crack propagation behavior, including the wraparound behavior noted in local crack propagation direction as well as the formation of numerous micro-cracks under the main fracture surface. In particular, the comparison of the distribution of the cleavage plane directions quantitatively validated the proposed model. The proposed model in the present study showed potential to help clarify the relationship between microstructure and cleavage crack propagation resistance.