Mechanical properties of 4 rocks at different temperatures and fracture assessment using the strain energy density criterion

2021 ◽  
Vol 25 ◽  
pp. 100212
Author(s):  
J. Justo ◽  
J. Castro
Keyword(s):  
Mechanical Properties ◽  
Energy Density ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Different Temperatures ◽  
Fracture Assessment

scholarly journals A pseudo-anelastic model for stress softening in liquid crystal elastomers

2020 ◽  
Vol 476 (2243) ◽  
pp. 20200558
Author(s):  
L. Angela Mihai ◽  
Alain Goriely
Keyword(s):  
Liquid Crystal ◽  
Energy Density ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Experimental Tests ◽  
Recent Experimental Data ◽  
Continuous Variables ◽  
Stress Softening ◽  
Different Temperatures ◽  
Liquid Crystal Elastomers

Liquid crystal elastomers exhibit stress softening with residual strain under cyclic loads. Here, we model this phenomenon by generalizing the classical pseudo-elastic formulation of the Mullins effect in rubber. Specifically, we modify the neoclassical strain-energy density of liquid crystal elastomers, depending on the deformation and the nematic director, by incorporating two continuous variables that account for stress softening and the associated set strain. As the material behaviour is governed by different forms of the strain-energy density on loading and unloading, the model is referred to as pseudo-anelastic. We then analyse qualitatively the mechanical responses of the material under cyclic uniaxial tension, which is easier to reproduce in practice, and further specialize the model in order to calibrate its parameters to recent experimental data at different temperatures. The excellent agreement between the numerical and experimental results confirms the suitability of our approach. Since the pseudo-energy function is controlled by the strain-energy density for the primary deformation, it is valid also for materials under multiaxial loads. Our study is relevant to mechanical damping applications and serves as a motivation for further experimental tests.

scholarly journals Local strain energy density for the fracture assessment of polyurethane specimens weakened by notches of different shape

2017 ◽  
Vol 11 (42) ◽  
pp. 214-222 ◽  
Author(s):  
M. Peron ◽  
S.M.J. Razavi ◽  
F. Berto ◽  
J. Torgersen ◽  
L. Marsavina
Keyword(s):  
Energy Density ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Local Strain ◽  
Fracture Assessment

scholarly journals Volume free strain energy density method for applications to blunt V-notches

2020 ◽  
Vol 28 ◽  
pp. 734-742
Author(s):  
Pietro Foti ◽  
Seyed Mohammad Javad Razavi ◽  
Liviu Marsavina ◽  
Filippo Berto
Keyword(s):  
Energy Density ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Density Method ◽  
Free Strain
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