Gedvilas R. Determination of fatigue curves parameters and lifetime at low cycle straining for stainless steels: Master thesis of mechanical engineer / research advisor associate professor dr. R. Šniuolis; Šiauliai University, Technological Faculty, Mechanical Engineering Department. – Šiauliai, 2006. - 58 p. Cycle fracture parameters of structural materials at low cycle straining are understood as lifetime or low cycle fatigue curves that are constructed in coordinates or according to the number of loading cycles N. The lifetime of material at low cycle straining in elastic plastic area is expressed by Coffin’s equation. Parameter of Coffin’s equation C markedly differs from the experimental, therefore high errors occur in evaluating lifetime of the material. It is noticed in many works that parameter proposed by Coffin is close to experimental. Parameter m=0,5, proposed by Coffin, is determined according the low cycle fatigue curves in coordinates for structural materials. Parameters of low cycle fatigue curves mp, Cp for stainless steels according to Coffin were specified and parameters me, Ce according to elastic strain at low cycle straining at room and elevated temperature were determined. Analytic dependences of low cycle fatigue curve parameters on modified plasticity (su/sy)y were proposed, lifetime for stainless steels at room and elevated temperature was calculated in this work. Statistical analysis of results of low cycle fatigue fracture parameters and... [to full text]