3653 Stress intensity factors around two parallel cracks in epoxy-aluminum composite materials

2006 ◽  
Vol 2006.1 (0) ◽  
pp. 813-814
Author(s):  
Shouetsu ITOU ◽  
Takahiro HONMA ◽  
Yasuaki NAKASHIMA
Keyword(s):  
Stress Intensity ◽  
Composite Materials ◽  
Stress Intensity Factors ◽  
Intensity Factors ◽  
Aluminum Composite ◽  
Parallel Cracks ◽  
Two Parallel Cracks

scholarly journals Effect of Couple Stresses on the Stress Intensity Factors for Two Parallel Cracks in an Infinite Elastic Medium under Tension

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Shouetsu Itou
Keyword(s):  
Stress Intensity ◽  
Boundary Conditions ◽  
Elastic Medium ◽  
Stress Intensity Factors ◽  
Couple Stress Theory ◽  
Intensity Factors ◽  
Dual Integral Equations ◽  
Couple Stresses ◽  
Parallel Cracks ◽  
Two Parallel Cracks

Stresses around two parallel cracks of equal length in an infinite elastic medium are evaluated based on the linearized couple-stress theory under uniform tension normal to the cracks. Fourier transformations are used to reduce the boundary conditions with respect to the upper crack to dual integral equations. In order to solve these equations, the differences in the displacements and in the rotation at the upper crack are expanded through a series of functions that are zero valued outside the crack. The unknown coefficients in each series are solved in order to satisfy the boundary conditions inside the crack using the Schmidt method. The stresses are expressed in terms of infinite integrals, and the stress intensity factors can be determined using the characteristics of the integrands for an infinite value of the variable of integration. Numerical calculations are carried out for selected crack configurations, and the effect of the couple stresses on the stress intensity factors is revealed.

scholarly journals Determination of the Enhancement or Shielding Interaction between Two Parallel Cracks under Fatigue Loading

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1331 ◽  
Author(s):  
Zhichao Han ◽  
Caifu Qian ◽  
Lanqing Tang ◽  
Huifang Li
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Fatigue Loading ◽  
304 Stainless Steel ◽  
Shielding Effect ◽  
Stress Distributions ◽  
Intensity Factors ◽  
Parallel Cracks ◽  
Two Parallel Cracks

In this paper, the interactions between two parallel cracks are investigated experimentally and numerically. Finite element models have been established to obtain the stress intensity factors and stress distributions of the parallel cracks with different positions and sizes. Fatigue crack growth tests of 304 stainless steel specimens with the single crack and two parallel cracks have been conducted to confirm the numerical results. The numerical analysis results indicate that the interactions between the two parallel cracks have an enhancement or shielding effect on the stress intensity factors, depending on the relative positions of the cracks. The criterion diagram to determine the enhancement or shielding effect between two parallel cracks is obtained. The changes of the stress fields around the cracks have been studied to explain the mechanism of crack interactions.

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