Effect of stress ratio on short fatigue crack growth

Article Abstract:

A model of short fatigue crack growth, based on the blocked slip concept and the shear decohesion mechanism, shows that the crack growth rate is proportional to the shear strain range and the maximum plastic zone size. The model does not require any arbitrary variables to predict short crack growth under high strain level and requires one constant under low strain level. It does not require extensive short crack growth data to predict the crack propagation and fatigue lifetime. The model accurately explains the experimental results for various mean stress levels and stress ranges.

Metals, Metal fatigue

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A comparison of the strains due to edge cracks and cuts of finite width with applications to residual stress measurement

Article Abstract:

The deformation due to a cut of finite width in a semi-infinite plane is studied using the body force method. General solutions for stresses for an arbitrary distribution of normal and shear tractions on the faces of the crack or cut. The strain on the free surface at a certain distance from the side of the cut is also determined analytically. Results show that the deformation due to a cut of finite width is considerably larger than that for an edge crack if the depth to width ratio of the cut is less than five.

Deformations (Mechanics), Deformation

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Surface strains due to face loading of a slot in a layered half-space

Article Abstract:

A compliance method allows measurement of residual stress due to arbitrary normal loading on the faces of a slot in a layered half-space. The layers consist of homogenous isotropic elastic materials with different elastic constants. The results of the body force method are significantly affected by the elastic properties of the substrate and layers. The method allows observation of stress variation with layer depth.

Measurement, Observations, Residual stresses, Surfaces (Physics), Layer structure (Solids)

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