Comparison of different types of stress gradient methods belonging to the theory of critical distances

Notches are almost unavoidable in material production. A notched geometry may cause crack initiation which can be followed by crack growth and in the end material failure. Gradient methods are one of the easiest and most useful analytical methods to calculate stress concentrations around the notches. In this project thesis, different gradient methods are compared for a simple plane stress example with different notch geometries. FEM analysis is done for the notched geometries to find resulting stresses. Stress concentrations around the notches are calculated with different stress gradient methods. These stress gradient methods, point method, line method and are method are compared for different critical distances. Up to 45% difference is found between calculated effective stresses between AM and the other two methods which may lead to critical differences in fatigue life.

DDC Class

600: Technik

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http://rightsstatements.org/vocab/InC/1.0/

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Comparison of Different Types of Stress Gradient Methods Belonging to the Theory of Critical Distances - Kagan Koyunseven.pdf

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4.3 MB

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Comparison of different types of stress gradient methods belonging to the theory of critical distances