Effects of temperature gradients on crack characterisation under thermal-mechanical loading conditions
Source abstract
Abstract
With increasing temperature yield stress and Young's modulus of an engineering material decrease. The stress and displacement distributions of a crack may be substantially affected by varying temperature. Using the deformation theory of plasticity we study effects of temperature gradients on crack assessments. It is shown that a sufficiently large J control zone can be found only if the temperature gradients are small. Increasing the temperature gradient will continuously diminish the J control. The mechanical load amplitude of the tension specimen hardly affects the J control zone size, whereas the bend loading may further decrease the J characterization. The two parameter description J-Q can slightly improve the prediction of the crack tip fields. The second terms of the stress expansions generally depend on both coordinates as soon as the temperature gradients become significant. A large J control zone has been found in plane stress crack tip fields even for high temperature gradients.
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Research context
OpenAlex topics: Fatigue and fracture mechanics · Mechanical stress and fatigue analysis · Ultrasonics and Acoustic Wave Propagation
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References (25)
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