Abstract
"ENGINEER", established in 1973 by The Institution of Engineers, is a Journal for dissemination of Engineering knowledge, published quarterly.If you are interested in contributing an Original Technical Paper based on research by the author(s) (intended for Section I) or an Original Article of Professional or Technical interest related to Engineering. (Section II) to this journal please go through the publication checklist which can be downloaded from here.Cover DescriptionCover images show a few views of Stage II of the Central Expressway from Mirigama to Kurunegala. The Institution of Engineers Sri Lanka acknowledges the Road Development Authority (RDA) for the images.
Highlights
Complex engineering designs subjected to cyclic non proportional loadings help to produce multi axial stresses and these stresses cause to damage the design under multiaxial fatigue
This paper discusses the various types of hysteresis loops that are essential to find the plastic strain ranges which are used for fatigue life prediction under variable amplitude tensiontorsion multiaxial axial proportional and nonproportional paths
The modern approach of the fatigue life prediction under uniaxial loading is based on strain rather than stress, the former being more appropriate for modelling the plasticity which the component undergoes at the critical state of failure [5]
Summary
Complex engineering designs subjected to cyclic non proportional loadings help to produce multi axial stresses and these stresses cause to damage the design under multiaxial fatigue. The first methods for understanding and assessing fatigue in the 1870's used the relationship between the magnitude of nominal stress cycles and the number of cycles to failure [1] This is the S-N method and it still has applications for components that are designed to survive very large numbers of cycles such as engine connecting rods. This paper discusses the various types of hysteresis loops that are essential to find the plastic strain ranges which are used for fatigue life prediction under variable amplitude tensiontorsion multiaxial axial proportional and nonproportional paths. The hysteresis loops were obtained for different load sets of proportional and non-proportional loads and the notch root strains were detected experimentally
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