...Bhasker Paliwal; Youssef Hammi; Mei Chandler; Robert D. Moser; Mark F. Horstemeyer A new dynamic strain rate-dependent elasto-viscoplastic damage constitutive model for ultrahigh-performance concrete (UHPC) is developed by incorporating Duvaut–Lions viscoplasticity generalized to multisurface...

... expression, T α , is extensively discussed. Then, emphasis is put on the stress-strain behavior in tension and compression over the low deformation range covering the elastic, anelastic, and viscoplastic response. The reported data depend, as expected, on temperature and strain rate and also, markedly...

...Ardeshir H. Tehrani; Rashid K. Abu Al-Rub In this study, damage evolution in a nanocomposite containing the polymethyl methacrylate polymer (PMMA) embedded with silicate nanoclay particles is simulated by using a nonlinear viscoelastic, viscoplastic, and viscodamage constitutive model...

... Lap Joints Considering Viscoplasticity in Adhesives ,” Comput. Struct. , 79 , pp. 769 – 783 . 10.1016/S0045-7949(00)00160-7 5 Cheikh , M. , Coorevits , P. , and Loredo , M. , 2001 , “ Modelling the Stress Vector Continuity at the Interface of Bonded Joints ,” Int. J. Adhes...

... and viscoplastic deformation stages. However, little quantitative information about the void evolution with the drawing level is to date available in the literature. The objective of this work is to quantify cavitation mechanisms in neat and calcium carbonate-filled high-density polyethylene (HDPE) subjected...

... and a unified viscoplasticity model at the global level, respectively. The stress-assisted oxygen diffusion was driven by the gradient of hydrostatic stress in terms of pressure factor. Heterogeneous deformation presented at the grain level imposes a great influence on oxygen diffusion at 750 ∘ C and above...

... elements were employed to prevent penetration at the glass–container interface. Roughness of these contact surfaces was modeled as an equivalent air gap with temperature-dependent conductivity in the thermal model. The stress model features elastic-viscoplastic constitutive equations developed based...

... prediction of stresses and deformations of UHMWPE components under service conditions is essential for the design and analysis of these components. This, in turn, requires a cyclic, viscoplastic constitutive model that can simulate cyclic responses of UHMWPE under a wide variety of uniaxial and multiaxial...

...P. Grammenoudis; D. Reckwerth; Ch. Tsakmakis Anisotropic viscoplasticity coupled with anisotropic damage has been modeled in previous works by using the energy equivalence principle appropriately adjusted. Isotropic and kinematic hardenings are present in the viscoplastic part of the model...

..., the texture was simulated at different angular positions with the help of the viscoplastic self-consistent model. The changes in the textures due to DRX were explained in terms of the Taylor factor. Finally, the texture evolution was interpreted with the help of the behavior of ideal orientations...

..., “Modelling Adiabatic Shear Banding Via Damage Mechanics Approach,” Arch. Mech., 55, pp. 3–38 ; 2005, “Adiabatic Shear Banding Induced Degradation in a Thermo-Elastic/Viscoplastic Material Under Dynamic Loading,” Int. J. Impact Eng., 32, pp. 285–320 ). The second novel contribution concerns numerical solution...

... of Viscoplasticity,” Arch. Mech., 27, pp. 857–868), the viscoplasticity, and the J 2 plasticity can all be revealed and recovered within the multiscale thermodynamic framework. e-mail: yangq@tsinghua.edu.cn 08 07 2007 12 02 2008 26 08 2008 irreversible thermodynamics viscoplasticity...

...Joel V. Bernier; Nathan R. Barton; Jaroslaw Knap In this study, a multiscale material model is employed to simulate two metal forming processes: 2D plane strain compression and a 3D biaxial bulge test. A generalized Taylor-type polycrystal model is employed to describe the fine scale viscoplastic...

... reinforced plastics hardening softening stress-strain relations voids (solid) composite polymer PMMA void viscoplasticity finite elements damage The cost of a composite structure lies for the most part in manufacturing. An actual manufacturing process seldom produces composite...

...Youliang He; Paul R. Dawson; Donald E. Boyce The evolution of voids (damage) in friction stir welding processes was simulated using a void growth model that incorporates viscoplastic flow and strain hardening of incompressible materials during plastic deformation. The void growth rate is expressed...

... can be done. Within the framework of rigid-viscoplastic formulation, the equivalent flow stress is assumed to be a direct function of the equivalent plastic strain rate ( ϵ ¯ ̇ ) , via 1 σ ¯ = C ϵ ¯ ̇ m where the strength coefficient C (MPa...

...Erik Marklund; Janis Varna; Lennart Wallström In tensile tests the flax/polypropylene composites clearly show nonlinear behavior in loading and hysteresis loops in unloading. In creep tests performed at different load levels the response was nonlinear viscoelastic, and after recovery, viscoplastic...

... optimum thickness and to test different thermal loads in order to optimize the industrial process and to improve the tool’s life. 11 09 2003 26 06 2006 stress analysis finite element analysis thermal stresses life testing thermocouples pyrometers elastoplasticity viscoplasticity...

... the aforementioned creep and relaxation behavior have been made by modifying the existing formulation of the viscoplasticity theory based on overstress, which is a constitutive state-variable based model. A modified, single-element standard linear solid serves as a suitable descriptor of the model. Linking of two...

...Ozgen U. Colak; Necmi Dusunceli The viscoelastic and viscoplastic behaviors of high density polyethylene (HDPE) under uniaxial monotonic and cyclic loading are modeled using the modified viscoplasticity theory based on overstress (VBO). The viscoelastic modeling capabilities of the modified VBO...