Modeling of failure mode switching and shear band propagation using the correspondence framework of peridynamics. (15th October 2018)

• Record Type: Journal Article
• Authors: Liu, Wenyang; Yang, Gang; Cai, Yong
• Is Part Of: Computers & structures. Volume 209(2018)
• Page Start: 150
• Page End: 162
• Publication Date: 2018-10-15
• Subjects: Peridynamics -- Adiabatic shear band -- Crack propagation -- Failure mode transition -- Thermo-elasto-viscoplastic; Structural engineering -- Data processing -- Periodicals; Electronic data processing -- Structures, Theory of -- Periodicals; 624.171
• DOI: 10.1016/j.compstruc.2018.08.007
• Languages: English
• ISSNs: 0045-7949

Abstract

Highlights: An approach to model failure mode switching and shear band propagation is developed. A combined peridynamic nonlocal and classical local damage model is used. The classical constitutive relation for viscous fluid is adapted for use in peridynamics. The approach is validated by modeling asymmetric impact on a pre-notched plate. Dynamic failure mode switching and shear band propagation are accurately captured. Abstract: This study presents an approach to model dynamic failure mode switching and shear band propagation using the correspondence framework of state-based peridynamics. To effectively model spontaneous shear-band-to-crack switching phenomenon, which is of intrinsic complexity, a combined peridynamic nonlocal and classical local damage model for failure prediction is proposed. The concept of bond failure, often employed in the bond-based peridynamic modeling of brittle materials, is extended to the state-based peridynamics to model cleavage failure in elasto-viscoplastic materials so that the directional and progressive nature of damage can be readily handled. The classical constitutive relation for viscous fluid is adapted for use in non-ordinary state-based peridynamics to model stress collapsing state in shear bands. To show the effectiveness of the proposed approach, a comprehensive numerical study of a pre-notched plate subjected to asymmetric impact loading is conducted, including the phenomenon of shear-band-to-crack switching under an intermediate impact velocity and ductile failure under high impact velocity. A zero-energy mode suppression with an upper bound to avoid over-correction is introduced. By using the proposed modeling approach, dynamic failure mode switching and shear band propagation path are accurately captured.