Energy-release-rate evaluation for delamination growth prediction in a multi-plate model of a laminate composite

1995 ◽  
Vol 15 (5) ◽  
pp. 443-459 ◽  
Author(s):  
B. P. Naganarayana ◽  
S. N. Atluri
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Laminate Composite ◽  
Plate Model ◽  
Growth Prediction ◽  
Delamination Growth ◽  
Rate Evaluation

Energy Release Rate of Piezoelectric Laminated Cylindrical Shell with Delamination under Circumferential Concentrated Load

2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Yang Jinhua ◽  
Fan Wenliang
Keyword(s):  
Cylindrical Shell ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Moving Boundary ◽  
Mechanical Load ◽  
Concentrated Load ◽  
Laminated Shell ◽  
Delamination Growth ◽  
Griffith Criterion

AbstractThe delamination growth may occur in piezoelectric laminated shell with delamination under a combined electro-thermo-mechanical loading. Based on the piezoelectric theory, the variational principle of moving boundary and considering the contact effect between delamination regions, the nonlinear governing equations for the piezoelectric laminated shell with delamination under hygrothermal condition are derived, and the corresponding boundary and matching conditions are given as well. At the same time, according to the Griffith criterion, the formula of energy release rate along the delamination front is obtained and the delamination growth is studied. In the numerical calculation, the energy release rate and delamination growth of axisymmetrical piezoelectric cylindrical shell are analyzed, and a parametric study is conducted, showing the effects of geometric nonlinear, voltage, temperature and humidity, mechanical load, delamination length and depth, geometrical parameter and material property on energy release rate.

An Application of Finite Element-Based Fracture Mechanics Analysis to Cord-Rubber Structures

1996 ◽  
Vol 24 (3) ◽  
pp. 220-235 ◽  
Author(s):  
T. G. Ebbott
Keyword(s):  
Finite Element ◽  
Energy Release Rate ◽  
Energy Release ◽  
Crack Growth ◽  
Release Rate ◽  
Fatigue Behavior ◽  
Internal Crack ◽  
Materials Testing ◽  
Element Analysis ◽  
Rate Evaluation

Abstract A finite element-based method to analyze the severity of internal cracks in cord-rubber structures is presented. The method includes materials testing to characterize rubber fatigue behavior, a global-local finite element analysis to provide the detail necessary to model explicitly an internal crack, and use of the J-integral and virtual crack closure techniques for energy release rate evaluation. Analysis of the multiaxial and cyclic fracture situation is carried out by considering the cycle of each mode of fracture separately and then combining the effect of each mode to determine the total effect. Crack growth rates in the structure are assumed to be the same as the crack growth rate in a laboratory specimen at the same level of cyclic energy release rate. Results are presented for a material change in a critical tire region.

Delamination Growth Behavior of a Fabric Reinforced Laminated Composite Under Mode I Fatigue

1999 ◽  
Vol 121 (3) ◽  
pp. 381-385 ◽  
Author(s):  
D. R. Atodaria ◽  
S. K. Putatunda ◽  
P. K. Mallick
Keyword(s):  
Growth Rate ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Strain Energy ◽  
Strain Energy Release Rate ◽  
Laminated Composite ◽  
Strain Energy Release ◽  
Growth Behavior ◽  
Delamination Growth

The purpose of this study is to investigate the delamination growth behavior of a glass fabric reinforced laminated composite under Mode I fatigue loading and to examine the applicability of a new fatigue crack growth rate model to this material. In this study, double contilever beam specimens were subjected to tension-tension cyclic loads with three different load ratios and the delamination growth rate was measured using the compliance method. The delamination growth rate was related to the strain energy release rate during fatigue cycling by a power law equation that takes into account not only the effect of the strain energy release rate range, but also the effect of delamination growth at various stages of loading using a weight average strain energy release rate. It was observed that this new model can represent the delamination growth rate of the fabric reinforced laminated composite at three different load ratios in a single unifying curve.

Delamination Growth of Piezoelectric Cylindrical Shell with Delamination under Hygrothermal Conditions

2015 ◽  
Vol 4 (2) ◽  
Author(s):  
Yang Jinhua ◽  
Fan Wenliang
Keyword(s):  
Cylindrical Shell ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Moving Boundary ◽  
Mechanical Load ◽  
Structural Failure ◽  
Delamination Growth ◽  
Griffith Criterion ◽  
Piezoelectric Shell

AbstractThe delamination growth may occur in delaminated piezoelectric shell subjected to external dynamic load and it will further cause structural failure. Based on the variational principle of moving boundary and considering the contact effect between delamination regions, in this paper, the nonlinear governing equations for the delaminated piezoelectric shell under hygrothermal condition are derived, and the corresponding boundary and matching conditions are given. At the same time, according to the Griffith criterion, the formulas of energy release rate along the delamination front are obtained and the delamination growth is studied. In the numerical calculation, the energy release rate and delamination growth of axisymmetrical piezoelectric cylindrical shell are analyzed, and the effects of geometric nonlinear, voltage, temperature and humidity, mechanical load, delamination length and depth, geometrical parameter and boundary condition on delamination growth are discussed.

Energy Release Rate of Delaminated Piezoelectric Shell Subjected to Electro-Thermo-Mechanical Loadings

2015 ◽  
Vol 751 ◽  
pp. 118-123
Author(s):  
Jin Hua Yang ◽  
Peng Jun Zhang ◽  
Chang Zhao Qian
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Moving Boundary ◽  
Mechanical Load ◽  
Structural Failure ◽  
Delamination Growth ◽  
Griffith Criterion ◽  
Delamination Front ◽  
Piezoelectric Shell

The delamination growth may occur in delaminated piezoelectric shell subjected to external load and it will further cause structural failure. Based on the variational principle of moving boundary and considering the contact effect between delamination regions, in this paper, the nonlinear governing equations for the delaminated piezoelectric shell under electro-thermo-mechanical loadings are derived, and the corresponding boundary and matching conditions are given. At the same time, according to the Griffith criterion, the formulas of energy release rate along the delamination front are obtained and the delamination growth is studied. In the numerical calculation, the energy release rate and delamination growth of axisymmetrical piezoelectric cylindrical shell are analyzed, and the effects of voltage, temperature and humidity, mechanical load, delamination length and depth on delamination growth are discussed.

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