Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/169037
Title: Adaptive fourth-order phase-field modeling of ductile fracture using an isogeometric-meshfree approach
Authors: Li, Weidong
Ambati, Marreddy
Nguyen-Thanh, Nhon
Du, Hejun
Zhou, Kun
Keywords: Engineering::Mechanical engineering
Issue Date: 2023
Source: Li, W., Ambati, M., Nguyen-Thanh, N., Du, H. & Zhou, K. (2023). Adaptive fourth-order phase-field modeling of ductile fracture using an isogeometric-meshfree approach. Computer Methods in Applied Mechanics and Engineering, 406, 115861-. https://dx.doi.org/10.1016/j.cma.2022.115861
Journal: Computer Methods in Applied Mechanics and Engineering
Abstract: The fourth-order phase-field modeling of ductile fracture in elastic–plastic materials is performed via an adaptive isogeometric-meshfree approach. In the developed phase-field model, the total energy functional consists of the elastic contribution and the dissipated contribution because of fracture and plasticity. The coupling of the plasticity to fracture is implemented by a degradation function that is applied to the elastic energy. The present fourth-order phase-field model is capable of relaxing the mesh size requirements while accurately regularizing sharp cracks. To further enhance the computational efficiency, the isogeometric-meshfree approach is adopted for the numerical implementation of the phase-field model within a staggered computational framework. The developed approach can flexibly implement the C1-continuity of a crack phase field that is required by the fourth-order model. Moreover, an adaptive mesh refinement strategy is developed, which includes the gradient-based refinement indicators and the field transfer operators. Numerical simulations of a series of representative cases show that the developed fourth-order model can accurately and efficiently capture complex ductile fracture patterns including plastic localization, crack initiation, propagation, and merging, which demonstrates the reliability of the adaptive fourth-order phase-field modeling of ductile fracture.
URI: https://hdl.handle.net/10356/169037
ISSN: 0045-7825
DOI: 10.1016/j.cma.2022.115861
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2022 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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