The influence of ply sequence and thermoelastic stress field on asymmetric delamination crack growth behavior of embedded elliptical delaminations in laminated FRP composites

2006 ◽  
Vol 66 (3-4) ◽  
pp. 417-426 ◽  
Author(s):  
B PRADHAN ◽  
S PANDA
Keyword(s):  
Stress Field ◽  
Crack Growth ◽  
Thermoelastic Stress ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Delamination Crack ◽  
Frp Composites ◽  
Thermoelastic Stress Field

scholarly journals Methodology for Evaluation of Residual Stress Effect on Small Corner-Crack Initiation and Growth

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2904 ◽  
Author(s):  
Janghwan Kim ◽  
Jun Won Kang ◽  
Dong-Eun Lee ◽  
Dae Young Kim
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Crack Growth ◽  
Type Specimen ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Beam Specimen ◽  
Stress Effect ◽  
Residual Stress Field ◽  
Corner Crack

The growth behavior of a naturally initiated corner crack under a uniform residual stress field is investigated in this study. A convenient method is proposed to induce and evaluate the uniform residual stress field for a beam-type specimen. Fatigue tests are conducted with a rotary bending fatigue machine to investigate the growth of the corner crack. For this reason, a cylindrical specimen, which is typically used for rotating bending tests, is modified into a beam specimen. The corner crack growth behavior under residual stress is evaluated based on linear elastic fracture mechanics (LEFM) and compared with long through crack data. The test results verify that the corner crack growth under residual stress can be effectively evaluated by LEFM and estimated using long crack data.

Influence of Ply Sequence and Thermoelastic Stress Field on Asymmetric Delamination Growth Behavior Emanating From Elliptical Holes in Laminated FRP Composites

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Brajabandhu Pradhan ◽  
Poosa Ramesh Babu
Keyword(s):  
Stress Field ◽  
Energy Release ◽  
Strain Energy ◽  
Thermoelastic Stress ◽  
Strain Energy Release ◽  
Growth Behavior ◽  
Delamination Growth ◽  
Elliptical Holes ◽  
Delamination Front ◽  
Thermoelastic Stress Field

The present study encompasses the influence of ply sequence and thermoelastic stress field on asymmetric delamination growth behavior emanating from elliptical holes in laminated fiber reinforced polymeric composites. Results, emphasizing the effect of thermal residual stresses on delamination growth behavior of the composite laminates subjected to two different loading conditions, i.e., in-plane tensile and compressive loadings, are presented. Two sets of full three-dimensional finite element analyses have been performed to calculate the displacements and interlaminar stresses along the delaminated interfaces responsible for the delamination onset and propagation. Modified crack closure integral methods based on the concepts of linear elastic fracture mechanics have been followed to evaluate the individual modes of strain energy release rates along the delamination front. In each case, the delamination is embedded at a different depth along the thickness direction of the laminates. It is observed that the fiber orientation of the plies bounding the delamination front significantly influences the distribution of the local strain energy release rate. Also, the residual thermal stresses have a detrimental effect on the laminates subjected to compressive loading and more so in the case of laminates with delaminations existing closer to the top and bottom surfaces of the laminate.

Simulation of Stress Corrosion Cracking in ICM Housing of Nuclear Power Plant

2012 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Kazuhiro Suga ◽  
Fuminori Iwamatsu ◽  
Yuichi Shintaku
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Stress Corrosion ◽  
Crack Growth ◽  
Stress Corrosion Cracking ◽  
Growth Behavior ◽  
Corrosion Cracking ◽  
Stress Fields ◽  
Crack Growth Behavior ◽  
Residual Stress Field

It has been reported that stress corrosion cracking damaged in-core monitor housing (ICM Housing), which occurred in a weld heat-affected zone because of the existence of residual stress. So it is important to evaluate crack growth behavior with high accuracy. In this study, crack growth behavior in ICM Housing is estimated using S-version FEM (S-FEM), which allows generation of the core finite model and the detailed mesh representing the crack independently. At first, axial, slant and circumferential surface cracks are assumed at two locations where residual stress fields are different from each other. One is isotropic residual stress field, and the other is circumferential residual stress field. It is shown that crack growth behaviors are different under different residual stress fields. Next, the effect of the slit, which exists between the ICM Housing and the Pressure Vessel is evaluated. It is shown that the existences of the slit increases stress intensity factors of growing surface crack. Finally S-FEM results are compared with those of the Influence Function Method (IFM), which assumes that an elliptical crack shape exists in a plate. It is shown that IFM result is conservative comparing to that of S-FEM.

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