Creep and fatigue behavior of 316L stainless steel at room temperature: Experiments and a revisit of a unified viscoplasticity model. (July 2018)

• Record Type: Journal Article
• Authors: Chen, Wufan; Kitamura, Takayuki; Feng, Miaolin
• Is Part Of: International journal of fatigue. Volume 112(2018)
• Page Start: 70
• Page End: 77
• Publication Date: 2018-07
• Subjects: Creep -- Fatigue -- Time-dependent plasticity -- Unified viscoplasticity model -- Static recovery term; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2018.03.010
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Creep-fatigue interaction tests of 316L stainless steel at room temperature. Plastic characteristics caused by alternate stress and strain holding. Effect of static recovery term in back stress on describing time-dependence. Abstract: A series of experiments was conducted to determine the fatigue and time-dependent behaviors of 316L stainless steel, including monotonic tensile and stress relaxation with different strain rates, fully reversed cyclic plasticity, creep and relaxation interaction, and cyclic stress relaxation tests. Although the material exhibited slight strain rate sensitivity from monotonic testing, considerable decay stress was observed in the relaxation during the following strain holding period. From the interaction tests between creep and stress relaxation with alternate strain and stress holding, we examined the evolution of the inelastic strain rate and found that the overall decelerating inelastic strain rate was detected regardless of the sequence of the stress and strain holding. Moreover, a typical unified viscoplasticity model was selected to simulate the creep and fatigue behaviors for time-dependent materials. We found that despite satisfactory description for most experimental results, inclusion of the static recovery term in the back stress evolution led to inappropriate prediction of the inelastic strain rate evolution.