Fatigue failure under stress below fatigue limit - From the viewpoint of internal stress.

Stress Concentrations , Fatigue , Fracture

The fundamental topic in this document is the development of cracks in steel. For structures subjected to cyclic loads, such cracks can develop over time and ultimately reach the size at which some dramatic failure occur. While this problem is rare in structures made of “mild steel,” the use of “high tensile” steel changes that situation. It is straightforward to double the strength of mild ste...

Stress Corrosion and Static Fatigue of Glass

to be published in Zeitschrift fuer Anorganische und Allgemeine Chemie. (b) Vladimir Balek, “Rare-Gas Diffusion, Reactivity and Electrical Conductivity of Solid ZnO”; to be published in Physica Status Solidi. l2 J. Beretka and M. J. Ridge, “Formation of Zinc Ferrite at Low Temperatures,” Nature (London), 216 [5114] 473-74 (1967). l3 Vladimir Balek. “Emanation Method for Estimating Reactivity of...

Valve Stress Analysis- For Fatigue Problems

Estimating Fatigue Curves With the Random Fatigue-Limit Model

In a fatigue-limit model, units tested below the fatigue limit (also known as the threshold stress) theoretically will never fail. This article uses a random fatigue-limit model to describe (a) the dependence of fatigue life on the stress level, (b) the variation in fatigue life, and (c) the unit-to-unit variation in the fatigue limit. We t the model to actual fatigue data sets by maximum likel...

Stress and fatigue constrained topology optimization

This thesis concerns structural optimization in conceptual design stages, for which constraints that are adapted to industrial requirements have been developed for topology optimization problems. The objective of the project has been to identify and solve problems that today prevent structural optimization from being used in a broader sense in the avionic industry; the main focus has been on st...