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首页> 外文期刊>Engineering Fracture Mechanics >Crack formation within ceramics via coupled multiscale genome and XFEM predictions under various loading conditions
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Crack formation within ceramics via coupled multiscale genome and XFEM predictions under various loading conditions

机译：在各种装载条件下，通过耦合的多尺度基因组和XFEM预测在陶瓷内裂缝形成

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摘要

Because of the complex heterogeneous microstructure of ceramics, predicting crack formation within ceramics is still a challenge. The extended finite element method (XFEM) serves as a good tool for fracture prediction but is incapable of considering heterogeneous microstructure. In this paper, a numerical framework is developed to model cracks within ceramics by coupling a multiscale genome model with XFEM. XFEM is embedded in the formulation of the multiscale genome through the variational asymptotic method for unit cell homogenization (VAMUCH). The implementation of both multiscale genome model and XFEM retains the capabilities of XFEM in modeling fracture while providing accurate predictions by considering heterogeneous microstructure. The crack formation within SiC ceramics under different loading conditions is simulated in comparison with experiments in order to assess the validity of the proposed method. It is shown that the developed model captures the typical characteristics of crack formation within silicon carbide (SiC) ceramics under bending and indentation loadings. The predicted cutting forces and crack depth exhibit a good agreement with the experimental results during machining processes.
机译：由于陶瓷的复杂非均相微观结构，预测陶瓷内的裂缝形成仍然是一个挑战。扩展有限元方法（XFEM）用作裂缝预测的良好工具，但不能考虑异质的微观结构。在本文中，通过将多尺度基因组模型与XFEM耦合，开发了一种数值框架以模拟陶瓷内的裂缝。 XFEM通过分析渐近方法来嵌入在多尺度基因组中，通过分析渐近方法进行单位细胞均匀化（VAMUCH）。多尺度基因组模型和XFEM的实施保留了XFEM在建模裂缝中的能力，同时通过考虑异质微观结构来提供准确的预测。与实验相比，模拟了在不同负载条件下的SiC陶瓷内的裂缝形成，以评估所提出的方法的有效性。结果表明，开发的模型在弯曲和压痕载荷下捕获碳化硅（SiC）陶瓷内裂缝形成的典型特性。预测的切割力和裂纹深度与加工过程中的实验结果表现出良好的一致性。

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