含裂纹相关耗散的动态断裂相场模型解的存在性
Existence of solutions to a phase-field model of dynamic fracture with a crack-dependent dissipation
AI总结:
该研究提出含裂纹尖端速度耗散效应的Ambrosio–Tortorelli型动态断裂相场模型,通过调整已有时间离散格式证明满足Griffith能量耗散平衡的裂纹演化解存在,并分析了无耗散的相关动态相场模型。
摘要:
我们提出一种基于Ambrosio–Tortorelli逼近的动态断裂相场模型,该模型纳入了由裂纹尖端速度引发的耗散效应。通过调整[C.J. Larsen、C. Ortner与E. Süli,《数学模型与方法在应用科学中的应用》(2010)]中提出的时间离散格式,我们证明了满足Griffith准则下能量-耗散平衡的动态裂纹演化的存在性。最后,我们分析了[B. Bourdin、C.J. Larsen与C.L. Richardson,《国际断裂杂志》(2011)]以及[C.J. Larsen,IUTAM材料力学变分概念及其应用研讨会(2010)]中不含耗散项的动态相场模型。
英文摘要:
We propose a phase-field model of dynamic fracture based on the Ambrosio--Tortorelli's approximation, which takes into account dissipative effects due to the speed of the crack tips. By adapting the time discretization scheme contained in [C.J. Larsen, C. Ortner, and E. Süli, Math. Models Methods Appl. Sci. (2010)], we show the existence of a dynamic crack evolution satisfying an energy-dissipation balance, according to Griffith's criterion. Finally, we analyze the dynamic phase-field model of [B. Bourdin, C.J. Larsen, and C.L. Richardson, Int. J. Fracture (2011)] and [C.J. Larsen, IUTAM Symposium on Variational Concepts with Applications to the Mechanics of Materials (2010)] with no dissipative terms.
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