Non-linear viscoelastic constitutive model for bovine cortical bone tissue

2016 ◽  
Vol 36 (3) ◽  
pp. 491-498 ◽  
Author(s):  
Marek Pawlikowski ◽  
Katarzyna Barcz
Keyword(s):  
Constitutive Model ◽  
Cortical Bone ◽  
Bone Tissue ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Viscoelastic Constitutive Model

scholarly journals A new non-linear viscoelastic-plastic seepage-creep constitutive model considering the influence of confining pressure

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 821-828 ◽  
Author(s):  
Ding Liu ◽  
Hai Pu ◽  
Yang Ju ◽  
Lili Cao ◽  
Ziheng Sha ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Creep Deformation ◽  
Constitutive Models ◽  
Confining Pressure ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Creep Models ◽  
Creep Constitutive Model ◽  
Plastic Creep

In this paper, the non-linear viscoelastic-plastic creep models in 1-D and 3-D casesare established. The new non-linear viscoelastic-plastic seepage-creep constitutive models addressed, considering the influence of confining pressure. The proposed models provide the prediction of the creep deformation under the seepage.

The Secondary Development of Nonlinear Viscoelastic Constitutive Model Based on ABAQUS

2011 ◽  
Vol 138-139 ◽  
pp. 466-470
Author(s):  
Long Yi ◽  
Yun Peng ◽  
Hou Quan Hong ◽  
Yu Liang Li
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Material Model ◽  
Secondary Development ◽  
Uniaxial Tensile ◽  
Finite Element Software ◽  
Material Constitutive Model ◽  
Nonlinear Viscoelastic ◽  
Linear Viscoelastic ◽  
Viscoelastic Constitutive Model

Based on the subroutine VUMAT, user-defined material model in the nonlinear finite element software ABAQUS/EXPLICIT, a nonlinear viscoelastic constitutive model is developed. The validify of the subroutine has been proven through the standard uniaxial tensile model. The shortage of finite element softwares which only have linear viscoelastic constitutive model is remedied. This paper presents the process of developing a material constitutive model and some useful technology. It can be referred for extending the material constitutive model in finite element softwares.

Modeling of Internal Damage Evolution During Actuation Fatigue in Shape Memory Alloys

2018 ◽  
Author(s):  
Francis R. Phillips ◽  
Daniel Martin ◽  
Dimitris C. Lagoudas ◽  
Robert W. Wheeler
Keyword(s):  
Phase Transformation ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Damage Evolution ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Internal Damage ◽  
Functional Fatigue ◽  
Non Linear

Shape memory alloys (SMAs) are unique materials capable of undergoing a thermo-mechanically induced, reversible, crystallographic phase transformation. As SMAs are utilized across a variety of applications, it is necessary to understand the internal changes that occur throughout the lifetime of SMA components. One of the key limitations to the lifetime of a SMA component is the response of SMAs to fatigue. SMAs are subject to two kinds of fatigue, namely structural fatigue due to cyclic mechanical loading which is similar to high cycle fatigue, and functional fatigue due to cyclic phase transformation which typical is limited to the low cycle fatigue regime. In cases where functional fatigue is due to thermally induced phase transformation in contrast to being mechanically induced, this form of fatigue can be further defined as actuation fatigue. Utilizing X-ray computed microtomography, it is shown that during actuation fatigue, internal damage such as cracks or voids, evolves in a non-linear manner. A function is generated to capture this non-linear internal damage evolution and introduced into a SMA constitutive model. Finally, it is shown how the modified SMA constitutive model responds and the ability of the model to predict actuation fatigue lifetime is demonstrated.

A non-linear viscoelastic model with structure-dependent relaxation times

1976 ◽  
Vol 1 (2) ◽  
pp. 147-157 ◽  
Author(s):  
D. Acierno ◽  
F.P. La Mantia ◽  
G. Marrucci ◽  
G. Rizzo ◽  
G. Titomanlio
Keyword(s):  
Relaxation Times ◽  
Viscoelastic Model ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Linear Viscoelastic Model
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