Parameter evolution in a continuous Masing approach for cyclic plasticity and its physical interpretation

Mayer, Thomas C.; Mazza, Edoardo; Holdsworth, S.R.

doi:10.1016/j.mechmat.2012.10.014

Cited by 12 publications

(3 citation statements)

References 35 publications

(42 reference statements)

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“…This approach is based on the Masing assumption of inhomogeneous deformation of the material as a result of different yield stresses of the individual volumes. Based on this hypothesis, the general statistical theory of the hysteresis loop has been formulated and used by a number of researchers for the analysis of the hysteresis loop shape of cyclically deformed materials. The distribution of the internal critical stresses in individual microvolumes of the material is strongly supported by the observations of the localization of the cyclic plastic strain in fatigued single and polycrystals .In the general statistical theory of the hysteresis loop, material consists of microvolumes classified according to their internal critical stress σ ic .…”

Section: Discussionmentioning

confidence: 99%

Microstructural stability of ODS steels in cyclic loading

Kuběna

Polák

Płociński

et al. 2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T The remarkable microstructural stability of high chromium steels prepared by powder metallurgy and strengthened by dispersion of nanometric yttrium oxides in cyclic loading at high temperatures is reported. Contrary to the continuous cyclic softening and profound changes in the microstructure during fatigue of common high chromium steels, the addition of 0.3 wt% Y 2 O 3 stabilizes the microstructure and significantly reduces cyclic softening of investigated steels. The evolution of microstructure as a result of fatigue loading at room temperature, 650 and 750°C, was examined by means of transmission electron microscopy. Only minor changes in the microstructure were detected. The stability of oxide particles after high-temperature exposure was confirmed by energy dispersion spectroscopy chemical analysis. The microstructural features are discussed in relation to the cyclic behaviour of the oxide dispersion strengthened steels. The analysis of the hysteresis loop indicates that oxide nanoclusters are intersected and dissolved in slip bands of ODS Eurofer steel. This process contributes to cyclic softening.Keywords steel; microstructure; fatigue.N O M E N C L A T U R E EBSD = electron backscattered diffraction EDS = energy dispersion spectroscopy LAB = low angle boundary ODS = oxide dispersion strengthened RAF = reduced activation ferritic RAFM = reduced activation ferritic-martensitic SEM = scanning electron microscopy STEM = scanning transmission electron microscopy TEM = transmission electron microscopy E eff = effective elastic modulus (MPa) N = number of cycles (À) ε r = relative strain (À) σ a = stress amplitude (MPa) σ Ε = effective stress (MPa) σ I = internal stress (MPa) σ r = relative stress (MPa)

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Section: Discussionmentioning

confidence: 99%

Microstructural stability of ODS steels in cyclic loading

Kuběna

Polák

Płociński

et al. 2015

Fatigue Fract Eng Mat Struct

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“…The Ramberg-Osgood model has proven to be a good description of the cyclic stress-strain relationship of the metallic materials by many studies, and the Masing criterion shows that the stress-strain path under cyclic loading can be described by amplifying 1 time the cyclic stress-strain curve in a steady state [62][63][64][65], such as explained in Figure 13. Based on the theory, and considering the effect of the damage, the evolution equation of damage variable D is introduced to construct a model of the hysteretic curve for the welding material.…”

Section: A Model Of Hysteretic Curve With Damage Accumulationmentioning

confidence: 99%

“…n semi-cycle is shown as an example to describe the hysteresis criterion. in a steady state [62][63][64][65], such as explained in Figure 13. Based on the theory, and considering the effect of the damage, the evolution equation of damage variable Dis introduced to construct a model of the hysteretic curve for the welding material.…”

Section: A Model Of Hysteretic Curve With Damage Accumulationmentioning

confidence: 99%

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

2018

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The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude, unloading stiffness and energy dissipation capacity. The results show that the cyclic softening behavior of welding materials is apparent, however, the steel shows hardening behavior with the increase of cyclic cycles, while the cyclic stress amplitude, unloading stiffness, and energy dissipation capacity of the welding materials degenerate gradually. Based on the Ramberg–Osgood model and introducing the damage variable D, a hysteretic model of welding material with the effect of damage accumulation was established, including an initial loading curve, cyclic stress-strain curve, and hysteretic curve model. Further, the evolution equation of D was also built. The parameters reflecting the damage degradation were fitted by the test data, and the simulation results of the model were proved to be in good agreement with the test results.

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Hysteresis Loop Analysis in Cyclically Strained Materials

Polák

Petráš

2015

Inelastic Behavior of Materials and Structures Under Monotonic and Cyclic Loading

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Parameter evolution in a continuous Masing approach for cyclic plasticity and its physical interpretation

Cited by 12 publications

References 35 publications

Microstructural stability of ODS steels in cyclic loading

Microstructural stability of ODS steels in cyclic loading

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

Hysteresis Loop Analysis in Cyclically Strained Materials

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