Numerical Investigations of Corner Singularities in Cracked Bodies

Pavel Hutař; Luboš Náhlík; Zdeněk Knésl

doi:10.4028/www.scientific.net/KEM.348-349.377

Paper Titles

Experimental Study on Mechanical Behaviors of the Prestressed Concrete Girder
p.361

The Hysteretic Energy Analysis of Inelastic Structures during the Earthquake
p.365

Concrete Damage Parameter and its Size Effect
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Prediction of Welding Distortions of Stainless Steel Ship
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Numerical Investigations of Corner Singularities in Cracked Bodies
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Top Beam Flange Fracture Behavior in Steel Frame Connections under Gravity Loads
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Initial Aspects of Low-Cycle Fatigue Fracture of Martensitic Steels
p.385

Structural Damage Survey Using Nondestructive Tests Based on Stress Waves
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Numerical Modeling of Wave Propagation vs. NDT in Multi-Layer Media
p.393

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Numerical Investigations of Corner Singularities in Cracked Bodies

Abstract:

The influence of corner singularity on the distribution of the stresses around the crack front for a three-dimensional structure is described in this paper. The distribution of stress singularity through the thickness of the middle tension specimen provides us an indication of crack behaviour close to a free surface. An estimation of the region where the change of singularity exponent plays an important role in fatigue crack propagation rate was carried out. A decrease in fatigue crack propagation rate close to the free surface was found. The lower fatigue crack propagation rate in the boundary layer in comparison with the interior of the specimen leads to a change of intersecting angle between crack and free surface and depends on Poisson’s ratio.