scholarly journals Energy release rate analysis on the interface cracks of enamel-cement-bracket fracture using virtual crack closure technique

2017 ◽  
Vol 908 ◽  
pp. 012016
Author(s):  
S F Samshuri ◽  
R Daud ◽  
M A Rojan ◽  
F Mat ◽  
K S Basaruddin ◽  
...  
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Crack Closure ◽  
Release Rate ◽  
Virtual Crack Closure Technique ◽  
Closure Technique ◽  
Interface Cracks ◽  
Rate Analysis

Calculating Energy Release Rate as a Function of Crack Length Using a Multiple-Step Crack Closure Technique in Tire Finite Element Models

2018 ◽  
Vol 46 (3) ◽  
pp. 130-152
Author(s):  
Dennis S. Kelliher
Keyword(s):  
Finite Element ◽  
Energy Release Rate ◽  
Crack Length ◽  
Energy Release ◽  
Crack Closure ◽  
Release Rate ◽  
Fatigue Behavior ◽  
Three Dimensions ◽  
Quantitative Prediction ◽  
Closure Technique

ABSTRACT When performing predictive durability analyses on tires using finite element methods, it is generally recognized that energy release rate (ERR) is the best measure by which to characterize the fatigue behavior of rubber. By addressing actual cracks in a simulation geometry, ERR provides a more appropriate durability criterion than the strain energy density (SED) of geometries without cracks. If determined as a function of crack length and loading history, and augmented with material crack growth properties, ERR allows for a quantitative prediction of fatigue life. Complications arise, however, from extra steps required to implement the calculation of ERR within the analysis process. This article presents an overview and some details of a method to perform such analyses. The method involves a preprocessing step that automates the creation of a ribbon crack within an axisymmetric-geometry finite element model at a predetermined location. After inflating and expanding to three dimensions to fully load the tire against a surface, full ribbon sections of the crack are then incrementally closed through multiple solution steps, finally achieving complete closure. A postprocessing step is developed to determine ERR as a function of crack length from this enforced crack closure technique. This includes an innovative approach to calculating ERR as the crack length approaches zero.

scholarly journals Research on Multiple Griffith Cracks at the Interface of Fine-Grained Piezoelectric Coating/Substrate

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Shuaishuai Hu ◽  
Jiansheng Liu ◽  
Junlin Li
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Singular Integral ◽  
Release Rate ◽  
Electric Displacement ◽  
Singular Integral Equations ◽  
Interface Cracks ◽  
Fine Grained ◽  
Piezoelectric Structure ◽  
Bimaterial Structure

The behavior of a fine-grained piezoelectric coating/substrate with multiple Griffith interface cracks under electromechanical loads is investigated. In this work, double coupled singular integral equations are proposed to solve the fracture problems. Both the singular integral equation and single-valued conditions are simplified into an algebraic equation and solved by numerical calculation. Thereby, the intensity factors of electric displacement and stress obtained are used to obtain the expression of the energy release rate. Furthermore, numerical results of the energy release rate with material parameters are demonstrated. Based on the obtained results, it could be concluded that the energy release rate is closely related to the size of the interface cracks and the mechanical-electrical loading. For a bimaterial structure, the fine-grained piezoelectric structure exhibited better material performance compared to the large one.

Effect of the proximity to the 0°/90° interface on Energy Release Rate of fiber/matrix interface crack growth in the 90°-ply of a cross-ply laminate under tensile loading

2020 ◽  
Vol 54 (21) ◽  
pp. 3021-3034
Author(s):  
Luca Di Stasio ◽  
Janis Varna ◽  
Zoubir Ayadi
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Tensile Loading ◽  
Thickness Effect ◽  
Matrix Interface ◽  
Closure Technique ◽  
Geometric Configurations ◽  
Damage States ◽  
Fiber Matrix Interface

Models of Representative Volume Elements of cross-ply laminates with different geometric configurations and damage states are studied. Debond growth is characterized by the estimation of the Mode I and Mode II Energy Release Rate using the Virtual Crack Closure Technique. It is found that the presence of the [Formula: see text] interface and the thickness of the [Formula: see text] layer has no effect, apart from laminates with ultra-thin [Formula: see text] plies where it is however modest. The present analysis supports the claim that debond growth is not affected by the ply-thickness effect.

Numerical calculation of energy release rates by virtual crack closure technique

2004 ◽  
Vol 18 (11) ◽  
pp. 1996-2008 ◽  
Author(s):  
Yoon-Suk Chang ◽  
Jae-Boong Choi ◽  
Young-Jin Kim ◽  
Genki Yagawa
Keyword(s):  
Numerical Calculation ◽  
Energy Release ◽  
Crack Closure ◽  
Virtual Crack Closure Technique ◽  
Release Rates ◽  
Closure Technique ◽  
Energy Release Rates

scholarly journals Energy release rate of fiber/matrix interface crack growth in cross-ply laminates under transverse loading: effect of the 0/90 interface and of 0 layer thickness

2019 ◽  
Author(s):  
Luca Di Stasio ◽  
Janis Varna ◽  
Zoubir Ayadi
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Thickness Effect ◽  
Matrix Interface ◽  
Transverse Loading ◽  
Closure Technique ◽  
Geometric Configurations ◽  
Damage States ◽  
Fiber Matrix Interface

Models of Representative Volume Elements (RVEs) of cross-ply laminates with different geometric configurations and damage states are studied. Debond growth is characterized by the estimation of the Mode I and Mode II Energy Release Rate (ERR) using the Virtual Crack Closure Technique (VCCT). It is found that the presence of the 0° /90° interface and the thickness of the 0° layer have no effect, apart from laminates with ultra-thin 90° plies where it is however modest. The present analysis supports the claim that debond growth is not affected by the ply-thickness effect.

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