Fatigue and ratcheting interactions

Uniaxial ratcheting and fatigue failure of tempered 42CrMo steel: Damage evolution and damage-coupled visco-plastic constitutive model

“…The experimental results conducted by Rider et al (1995) showed that cyclic plastic strain vs. fatigue life curves did not fit Manson-Coffin relationship (Manson, 1954;Coffin, 1970) for En3 steel in the stress cycling with axial mean stress. Xia et al (1996) separated the effects of mean stress and ratcheting strain on the fatigue life of ASTM A-516 Gr.70 steel by two different preloading procedures, and found that both the ratcheting strain and mean stress can cause additional damage and then result in a monotonically decreasing of fatigue life when the applied mean stress increases, similar to the recent works by Kwofie and Chandler (2001), Yang (2005) and Kang and Liu (2008) for the polycrystalline copper, 45 carbon steel and annealed and tempered 42CrMo steels, respectively.…”

Experimental study on ratcheting-fatigue interaction of 20 carbon steel in uniaxial cyclic loading

“…For its importance in the design and assessment of structure components, the ratcheting-fatigue interaction has received significant attention in recent years. Some experimental results has been obtained, such as by Rider et al [5] for a low carbon steel En3, low alloy steel En19; by Xia et al [6] for ASTM A-516 Gr.70 steel; and by Kang et al [7][8] for annealed 42CrMo steel, tempered 42CrMo steel and SS304 stainless steel respectively. The existing experimental observations showed that the ratcheting behavior varies depending on the type of materials.…”

Evaluation of cyclic plasticity models in ratcheting simulation of straight pipes under cyclic bending and steady internal pressure

“…Under inelastic load reversals, fatigue failure may involve progressive accumulation of deformation or strain (known as ratcheting) within plastically deformed zones. The presence of ratcheting during cyclic loading may reduce the crack initiation life and thus the fatigue life of components (Rider et al, 1995;Wei et al, 2004;Lu, 2003), or may lead to structural collapse. The latter has been demonstrated for tubular structures by Shaw and Kyriakides (1985), Kyriakides and Shaw (1987), Corona and Kyriakides (1991), Vaze and Corona (1998), and for structural shapes by Bertero and Popov (1965), Ellison and Corona (1998) and Yin et al (2004), among others.…”