Plasticity theory for the multiaxial Local Strain-Life Method. (July 2017)

• Record Type: Journal Article
• Authors: Madrigal, C.; Navarro, A.; Vallellano, C.
• Is Part Of: International journal of fatigue. Volume 100:Part 2(2017)
• Page Start: 575
• Page End: 582
• Publication Date: 2017-07
• Subjects: Local Strain approach -- Multiaxial loading -- Cyclic plasticity -- Proportional and non-proportional loading -- Multiaxial fatigue; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2016.11.027
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Outline of cyclic plasticity theory without moving surfaces. Extends to multiaxial case techniques used in uniaxial Local Strain-Life Method. Application to erasure of memory experiments of Lamba and Sidebottom. Shows very good agreement between experiments and theoretical results. Abstract: This paper outlines a cyclic plasticity theory whose aim is to allow fatigue designers to make calculations for multiaxial loads in a way as similar as possible to what they do when using the well-known Local Strain methodology for uniaxial low–cycle fatigue problems. Thus we define concepts that translate to multiaxial loadings the intuitive methods for stress and strains calculations based on the use of the Ramberg-Osgood equation for the cyclic stress-strain curve, the adoption of Masing behavior with a factor-of-two assumption to model the hysteresis loops of the material from the cyclic curve and the invocation of the memory rule when hysteresis loops are "closed". The present theory is based upon the idea of distance between stress points and to calculate these distances we use the expression of the yield criterion of the material.