Abstract
The low-cycle fatigue experiments of mild carbon Q235B steel and its related welded-metal specimens are performed under uniaxial, in-phase, and 90° out-of-phase loading conditions. Significant additional cyclic hardening for 90° out-of-phase loading conditions is observed for both base metal and its related weldment. Besides, welding process produces extra additional hardening under the same loading conditions compared with the base metal. Multiaxial low-cycle fatigue strength under 90° out-of-phase loading conditions is significantly reduced for both base-metal and welded-metal specimens. The weldment has lower fatigue life than the base metal under the given loading conditions, and the fatigue life reduction of weldment increases with the increasing strain amplitude. The KBM, FS, and MKBM critical plane parameters are evaluated for the fatigue data obtained. The FS and MKBM parameters are found to show better correlation with fatigue lives for both base-metal and welded-metal specimens.
Highlights
Engineering components are always subjected to complex cycle loading during the service period, and the failure eventually occurs due to the accumulated fatigue damage [1]
The maximum shear and axial stress responses as well as shear and axial strains are simultaneous under in-phase loading conditions for both base-metal and welded-metal specimen
The following conclusions can be drawn: (1) Significant additional cyclic hardening effect is observed for both base steel and welded metal under out-of-phase loading conditions
Summary
Engineering components are always subjected to complex cycle loading during the service period, and the failure eventually occurs due to the accumulated fatigue damage [1]. The multiaxial stress/strain states commonly arise from multidirectional external loads, notch effects, and complex geometric features, which influence the fatigue strength of engineering components [3]. Understanding of multiaxial fatigue strength of metallic materials is always based upon the experimental observations from thin-walled tubular specimens under axial-torsional loading. The multiaxial fatigue tests are mainly focused on the base material of metals. Shang and Wang [9] conducted the fatigue tests on hot-rolled medium-carbon 45 steel under the axial-torsional loading using sinusoidal wave forms. The multiaxial cycle deformation and fatigue behaviors of type 304 stainless steel and medium-carbon 1050 steel are studied by Shamsaei [10]. Gladskyi and Shukaev [11] conducted the contrastive analysis of the uniaxial and multiaxial low-cycle fatigue strength of type BT1-0 titanium alloy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
