![]() ![]() Yield stress fluids are widely encountered in our surroundings, such as landslides, mud-debris flows and lava flows in mountain hazards foams, emulsions, polymer pastes and chocolate in industries ( Takeshi and Sekimoto, 2005 Ancey, 2007 Marmottant and Graner, 2007 Bénito et al., 2008 Balmforth et al., 2014). The suitability of FEMLIP to model elastoviscoplastic fluid is verified. Lastly, it is shown that EVPHB model also induces a stress relaxation process for materials under constant strain. Benchmarks also show that in FEMLIP the yielded and unyielded zones could be easily defined by EVPHB model according to the stress of a material point. For a time-dependent flow, because of the addition of elasticity, the EVPHB model makes the material experience a deformation process which is significantly distinctive from that produced by a pure regularized Herschel-Bulkley model. By tracing the historical variables of a material point, it is verified that in a time-independent flow the elastic strain and viscous strain rate could be accurately reproduced by EVPHB model. ![]() 2Faculty of Engineering, China University of Geosciences, Wuhan, Chinaįrom a variety of yield stress fluid models, an elastoviscoplastic Herschel-Bulkley (EVPHB) model written in 3D is selected and coupled with a Finite Element Method with Lagrangian Integration Points (FEMLIP) to solve boundary value problems with large deformation process.1China Electric Power Research Institute Co., Ltd., Beijing, China.Binbin Zhao 1,2*, Yongfeng Cheng 1, Yi Liu 1, Xiaoang Kong 1, Zhi Yang 1, Ruiming Tong 1, Xiyu Xu 1 and Yuanjing Deng 1 ![]()
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