High-order phase-field model with the local and second-order max-entropy approximants
Fatemeh AMIRI
Front. Struct. Civ. Eng. ›› 2019, Vol. 13 ›› Issue (2) : 406 -416.
High-order phase-field model with the local and second-order max-entropy approximants
We approximate the fracture surface energy functional based on phase-field method with smooth local maximum entropy (LME) and second-order maximum entropy (SME) approximants. The higher-order continuity of the meshfree methods such as LME and SME approximants allows to directly solve the fourth-order phase-field equations without splitting the fourth-order differential equation into two second-order differential equations. We will first show that the crack surface functional can be captured more accurately in the fourth-order model with smooth approximants such as LME, SME and B-spline. Furthermore, smaller length scale parameter is needed for the fourth-order model to approximate the energy functional. We also study SME approximants and drive the formulations. The proposed meshfree fourth-order phase-field formulation show more stable results for SME compared to LME meshfree methods.
second-order maximum entropy / local maximum entropy / second- and fourth-order phase-field models / B-spline
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