An Anisotropic, Damage-Coupled Viscoplastic Model for Creep-Dominated Cyclic Loading

2009 ◽  
pp. 173-173-22
Author(s):  
DL McDowell ◽  
K-I Ho ◽  
J Stalley
Keyword(s):  
Cyclic Loading ◽  
Anisotropic Damage ◽  
Viscoplastic Model

High Temperature Creep Damage Under Biaxial Loading—Part II: Model and Simulations

1990 ◽  
Vol 112 (4) ◽  
pp. 450-455 ◽  
Author(s):  
F. Trivaudey ◽  
P. Delobelle
Keyword(s):  
High Temperature ◽  
Biaxial Loading ◽  
Creep Damage ◽  
Internal Variables ◽  
Anisotropic Damage ◽  
High Temperature Creep ◽  
Viscoplastic Model ◽  
Temperature Creep ◽  
Complete Formulation ◽  
Damage Law

The inadequacies, in describing the high temperature creep damage of two industrial alloys (Part I) with a model where the anisotropic damage variable D depends only on time have been pointed out. It is therefore proposed to introduce directly strain rate in the damage law. This rule is then integrated into a unified viscoplastic model, with internal variables, that has been developed elsewhere. Some numerical simulations obtained with the complete formulation are reported and, in general, yield acceptable results.

scholarly journals Elastic-Viscoplastic Constitutive Model of Soil under Cyclic Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yuan Ma ◽  
Hua Liang ◽  
Yongxue You ◽  
Weiguang Zhang ◽  
Limin Guo ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Dynamic Stress ◽  
Stress Amplitude ◽  
Yield Criterion ◽  
Case Analysis ◽  
Research Field ◽  
Constant Amplitude ◽  
Bingham Model ◽  
Viscoplastic Model ◽  
Flow Criterion

The creep problems are often involved in soil under cyclic loading, and its behaviors of soil under cyclic loading sparks many arguments in current research field. To propose one new model to demonstrate these creep behaviors of soil under cyclic loading, the cyclic loading was simplified equivalently, and the elastic-viscoplastic model (EVPM) for soil under cyclic loading was established based on the Bingham model. The yield criterion for soil under cyclic loading with constant amplitude was proposed following the simplified load. A constitutive equation based on the EVPM was constructed by using the flow criterion related to the yield criterion. Meanwhile, the parameters of EVPM were identified and discussed. In addition, the case analysis of the EVPM was also performed. The results indicate that the stable and destructive creep behaviors of soil under cyclic loading could be well described by the recommended EVPM, and the obtained parameters in the model exhibited a clear regularity with the increase of dynamic stress amplitude. Besides, the established model could be selected to predict the stable and destructive creep behavior of soil under cyclic loading.

scholarly journals Ratcheting and recovery of adhesively bonded joints under tensile cyclic loading

2021 ◽  
Author(s):  
Yi Chen ◽  
Lloyd V. Smith
Keyword(s):  
Cyclic Loading ◽  
Failure Modes ◽  
Analytical Models ◽  
Temporal Response ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Viscoplastic Model ◽  
Nonlinear Viscoelastic ◽  
Recovery Response ◽  
Good Agreement

AbstractPolymers in general, and adhesives in particular, can exhibit nonlinear viscoelastic–viscoplastic response. Prior work has shown that this complex behavior can be described using analytical models, which provided good agreement with measured creep and recovery response. Under cyclic loading, however, some adhesives exhibit a temporal response different from what would be expected from their creep behavior. Ratcheting describes the accumulation of deformation from cyclic loading. The failure surfaces of adhesives subjected to creep and cyclic loads provide evidence of failure modes that depend on the loading history, suggesting a cause for the change in temporal response. The following considers two approaches to describe the ratcheting behavior of adhesives. Given the reduced time dependence, the first approach involved a nonlinear viscoelastic–plastic model. The second approach used a nonlinear viscoelastic–viscoplastic model, calibrated from the cyclic response, rather than the creep response. While both models showed good agreement with experiment for long exposure to cyclic loading, only the viscoelastic–viscoplastic model agreed with experiment for both short and long loading histories.

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