viscoplastic stress

(PDF) A unified approach to model elasto-viscoplastic

The signature of the yield stress in a viscous LissajousBowditch figure are vertical portions in the vicin- For a much lower or null level of thixotropy, namely ity of zero stress (i.e., below the yield stress), because below teq 1 = 0.01 and 0 (Figs. 12, 13, 14, and 15), the the yield stress, the stress is proportional to the strain

A nonlinear viscoelasticviscoplastic model for adhesives

Aug 27, 2020 · The viscoplastic strain was calculated using the Newton iterative method. A solution algorithm with stress correction for the combined viscoelasticviscoplastic model was developed. The model showed good agreement with experimental uniaxial creep and cyclic response, where the adhesives exhibited nonlinear viscoelastic and viscoplastic behaviors. A viscoplastic model of creep in shalePerzyna-type viscoplastic model In Perzynas model, the plastic viscous flow is related to the power of active stress (Perzyna, 1966). The active stress is defined as the distance between the current state of stress and the yield sur-face. Here, we adopt the principle of maximum plastic dissipation, D D;:;; and Viscoplastic model of creep

Development and Validation of a Non-Linear Viscoelastic

Oct 08, 2013 · In this work, a non-linear viscoelastic stress model based on the Schapery constitutive formulation is used with a Zapas-Crissman viscoplastic term to describe the response of a novel membrane material comprised of a blend of perfluorocyclobutane (PFCB) Difference Between Viscoelastic and Viscoplastic Compare Aug 11, 2020 · Viscoelastic materials are polymer substances that show both viscous and elastic properties during the deformation of the material. This property is named as viscoelasticity. Generally, viscous substances such as water resist shear flow and strain linearly with time when we apply stress.

Elastic, viscoelastic and viscoplastic contributions to

Elastic, viscoelastic and viscoplastic contributions to compliance during deformation under stress in prosthodontic temporization materials Acta Biomater Odontol Scand. 2016 Aug 24;2(1):108-117. doi:10.1080/23337931.2016.1219664. eCollection 2016 Dec. Authors Tritala K Vaidyanathan Modeling the temperature, crystallization, and residual Jul 01, 2021 · A thermomechanical model is developed to predict the temperature, degree of crystallization, residual stress, and strain in the selective laser sintering process for polymeric powder. Especially, a transient heat transfer model is used to calculate the temperature evolution. An elasticviscoplastic model is developed to describe the temperature- and time-dependent stress

Obstructed and channelized viscoplastic flow in a Hele

Feb 02, 2016 · Obstructed and channelized viscoplastic flow in a Hele-Shaw cell - Volume 790. and the asymptotic limits of relatively small or large yield stress. Periodic arrays of circular contractions or expansions are studied to explore the interference between obstructions. Finally, viscoplastic flow through a cell with randomly roughened walls is Statistics of the stress, strain-rate and spin fields in Apr 28, 2021 · Abstract:This paper provides estimates for the stress, strain-rate and spin field statistics in viscoplastic polycrystals. They are obtained by combining the fully optimized second-order (FOSO) homogenization method with the self-consistent estimate for linear polycrystalline aggregates. The FOSO linearization method allows the consistent

Viscoelastic Properties of Cardiovascular Tissues IntechOpen

Sep 21, 2016 · The aims of this chapter are to review the current state of knowledge regarding the viscoelastic behavior of cardiovascular tissues. We begin with a brief, general discussion of measurement and modeling of cardiovascular tissue viscoelasticity. We then review known viscoelastic behavior of arteries, veins, capillaries, blood components, the heart, and lymphatics. Viscoelastic and viscoplastic stress analysis of adhesive The viscoelastic and viscoplatic effects in an adhesively bonded joint are very important to understand. Most of the adhesives used in structural applications exhibit some viscoelastic-viscoplastic behaviour, especially at high temperatures and high stress levels. The redistribution of stresses and strains that occur in joints during the viscoelastic-viscoplastic deformation influences the strength of the joints

Viscoplastic water entry Journal of Fluid Mechanics

In the present study, we investigate the water entry of a viscoplastic (also known as yield stress) object. Such a material, if not sufficiently stressed, behaves like an elastic solid, but once the stress exceeds a critical value (the yield stress), the material deforms like a viscous fluid (typically with a Viscoplasticity - an overview ScienceDirect TopicsViscoplasticity refers to the mechanical response of solids involving time-dependent, irreversible (inelastic) strains. The deformation of essentially all metals is, to a certain extent, time-dependent. This dependence, however, becomes more pronounced at temperatures exceeding

A Viscoplastic Stress Relaxation Model for Predicting

Viscoplastic stress relaxation makes the stress field in the reservoir more isotropic. In normal faulting and strike-slip faulting environments, this causes the least principal stress to increase. Thus, formations with more viscoplastic stress relaxation are more likely to