Stress intensity factor and energy release rate of externally pressurized thick cross-ply (very) long cylindrical shells with low-hardening transverse shear modulus nonlinearity

2016 ◽  
Vol 151 ◽  
pp. 138-160 ◽  
Author(s):  
Reaz A. Chaudhuri
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Shear Modulus ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Transverse Shear ◽  
Cylindrical Shells

scholarly journals Combined Effect of Pressure and Shear Stress on Penny-Shaped Fluid-Driven Cracks

2018 ◽  
Vol 85 (3) ◽  
Author(s):  
Wenhao Shen ◽  
Ya-Pu Zhao
Keyword(s):  
Stress Intensity Factor ◽  
Shear Stress ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Propagation ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Crack Opening ◽  
Effect Of Pressure

Penny-shaped fluid-driven cracks are often detected in many fluid–solid interaction problems. We study the combined effect of pressure and shear stress on the crack propagation in an impermeable elastic full space. Boundary integral equations are presented, by using the integral transform method, for a penny-shaped crack under normal and shear stresses. The crack propagation criterion of stress intensity factor is examined with the strain energy release rate. Dominant regimes are obtained by using a scaling analysis. Asymptotic solution of the toughness-dominant regime is derived to show the effect of shear stress on the crack opening, crack length, and pressure distribution. The results indicate that a singular shear stress can dominate the asymptotic property of the stress field near the crack tip, and the stress intensity factor cannot be calculated even though the energy release rate is finite. Shear stress leads to a smaller crack opening, a longer crack, and a slightly larger wellbore pressure. A novel dominant-regime transition between shear stress and pressure is found. Unstable crack propagation occurs in the shear stress-dominant regime. This study may help in understanding crack problems under symmetrical loads and modeling fluid–solid interactions at the crack surfaces.

VALIDITY OF THE DIRECT RELATION BETWEEN THE FRACTURE MECHANICS PARAMETERS, K AND G, IN THE CASE OF BONE

2004 ◽  
Vol 04 (03) ◽  
pp. 321-331 ◽  
Author(s):  
SATYA PRASAD PARUCHURU ◽  
KOGANTI MOHAN RAO ◽  
XIAODU WANG ◽  
C. M. AGRAWAL
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Intensity Factor ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Sampling Site ◽  
Direct Relation ◽  
Linear Elastic

The critical values of stress intensity factor and energy release rate (KIc, GIc) are important fracture mechanics parameters used in the characterization of bone fracture, assessment of bone quality, and prosthesis design. There exists, a direct relationship between stress intensity factor, K and energy release rate, G that holds good for linear elastic, isotropic, and homogeneous materials. As bone is anisotropic and non-homogeneous, whether or not the relationship is still valid is an important factor. Bone is a brittle material and if it is tested for a particular crack orientation and at a particular sampling site, it may behave as a linear elastic, isotropic, and homogeneous material. The present work verifies the direct relation between K and G of bone in the case of tangential cracks.

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