| The objective of this research is to examine the low cycle tension-torsion multiaxial fatigue behavior in the perspective of engineering and science. This paper is made up of three parts, which adopted different approaches to tackle the low cycle tension-torsion multiaxial fatigue.; In Part 1 of this paper, some of the important aspects of the low cycle tension-torsion multiaxial fatigue were summarized. Based on the present knowledge, fundamentals on the low cycle tension-torsion multiaxial fatigue were established.; In Part 2 of this paper, a life prediction model was developed using a cyclic equivalent strain approach for predicting the low cycle tension-torsion multiaxial fatigue lives based on the uniaxial fatigue data. The cyclic equivalent strain approach enabled us to combine the uniaxial, torsional fatigue and tension-torsion multiaxial fatigue data into a single life equation. The above model was applied successfully to experimental data available in Waspaloy (two heat treatments) and 1045 steel.; In Part 3 of this paper, elaborately designed experiments were conducted to investigate the low cycle torsional and tension-torsion multiaxial fatigue behaviors of 1045 steel. The emphases were placed upon the elucidation of cyclic hardening behavior, the examination of the generic nature of slip and crack growth behaviors and the establishment of dislocation mechanism associated with the low cycle tension-torsion multiaxial fatigue. |
