Fracture analysis for viscoelastic creep using peridynamic formulation
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Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia
Submission date: 2021-10-27
Final revision date: 2022-06-10
Acceptance date: 2022-06-27
Online publication date: 2022-08-25
Publication date: 2022-11-25
Corresponding author
Muhammad Azim Azizi   

Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, Malaysia
Journal of Theoretical and Applied Mechanics 2022;60(4):579-591
The purpose of this paper is to provide a peridynamic (PD) model for the prediction of the viscoelastic creep deformation and failure model. The viscoelastic characteristic consists of several stages, namely primary creep, secondary creep, tertiary creep and fracture. A non- linear viscoelastic creep equation based on the internal state variable (ISV) theory covering four creep stages and PD equations are used. The viscoelastic equation is inserted into the PD equation to derive a PD model with two time parameters, i.e., numerical time and vis- coelastic real time. The parameters of the viscoelastic equation are analyzed and optimized. A comparison between numerical and experimental data is performed to validate this PD model. The new PD model for nonlinear viscoelastic creep behavior is confirmed by an ac- ceptable similarity between the numerical and experimental creep strain curves with an error of 15.85%. The nonlinearity of the experimental and numerical data is sufficiently similar as the error between the experimental and numerical curves of the secondary stage strain rate against the load is 21.83%. The factors for the errors are discussed and the variation of the constants in the nonlinear viscoelastic model is also investigated.
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