Abstract
After the investigation of 227 structural materials at low cycle straining, the cycle properties of structural materials by mechanical characteristics were evaluated. After a thorough analysis of the graphical results, the cyclic stress-strain curves parameter α , which characterizes intensity of cyclic hardening or softening of structural materials at room and elevated temperature rather precisely, was determined. Dependences for the evaluation of cyclic instability according to modified plasticity (s u /s y )Z at room and elevated temperature for structural steels and their weld metal were specified. DOI: http://dx.doi.org/10.5755/j01.mech.18.3.1887
Highlights
Working conditions and material properties of machines must be analyzed in order to improve their quality, reliability and lifetime
Strain and stress change during the exploitation depend on material type, we must know the material type that is chosen for the structures under low cycle loading
Monotonous tension and low cyclic loading are similar by accumulation of plastic strain, the mechanical characteristics can be used for quantitative evaluation of materials
Summary
Working conditions and material properties of machines must be analyzed in order to improve their quality, reliability and lifetime. Monotonous tension and low cyclic loading are similar by accumulation of plastic strain, the mechanical characteristics can be used for quantitative evaluation of materials This method was used in the early works of R. R4 Parameter α was determined from experimental rmeasutelrtRsia5olsf all materials tested at low cycle straining These have been divided into three groups in such manner: Rif7 0.01 0.01 the material was nominated as cyclicRa9lly stable, if 0.01 – as cyclically softened and if. When the widths of hysteresis loop for semicycles 1 and k are determined in coordinate lg k lgk , the parameter for the evaluation of cyclic instability (hardening or softening intensity) is determined by the equation invesRti9g.ated materials at room and elevated temperature are giRv1e0n. P 0.95 (95% area of normal curve) [6] were determined. (7) Here x is the mean value of experimental cyclic instability of structural materials and s is standard deviation
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