Comparative study of stainless steel and carbon steel tubular members subjected to cyclic loading
The material properties of stainless steel differ from those of carbon steel due to the influence of the alloying elements. Of particular significance to the performance of structural members under high-amplitude cyclic loading are the ratio of ultimate-to-yield strength and ductility at fracture of the material,both of which are greater for stainless steel than carbon steel. In this paper, results of cyclic axial and bending material tests on the two materials are presented. A method based on microplastic strain energy is adopted to correlate data from these two test configurations. Despite significantly different behaviour in monotonic tensile coupon tests, the two materials were found to perform similarly in terms of fatigue life and energy dissipation under high strain amplitude cyclic loading. In order to study the influence of material properties on the response of structural members, numerical models were developed to simulate tubular braces under cyclic axial loading.A damage model, in conjunction with output from the finite element analysis of cyclic axial loading tests, was used to predict the fatigue life of the braces. It was found that stainless steel members were more resistant to local buckling and exhibited a larger number of cycles to failure than their carbon steel counterparts. This isbelieved to be due to a higher post-yield stiffness.
K.H.Nip L.Gardner A.Y.Elghazouli
Department of Civil and Environmental Engineering, Imperial College London, UK
国际会议
第12届钢管结构国际学术会议(The 12th International Symposium on Tubular Structures)
上海
英文
219-226
2008-10-08（万方平台首次上网日期，不代表论文的发表时间）