Fatigue and inelasticity of metals under nonuniform stressed state

Troshchenko, V. T.

doi:10.1007/s11223-010-9241-1

Cited by 2 publications

(5 citation statements)

References 18 publications

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“…Fatigue life and limit values vary widely depending on the combination of metallurgical, structural, technological, and operational factors under which cyclic loading occurs. The following pattern can be traced in various studies: the steeper the slope of the fatigue curve in the high-cycle region, the lower the fatigue life of parts at stresses exceeding the fatigue limit and, as a rule, the lower the fatigue limit [10][11][12][13].…”

Section: Data Sources and Systematization Of Fatigue Informationmentioning

confidence: 99%

“…The main sources of experimental data for this research are experimental results obtained in [13,14], objectively limited in volume and range of variation of operating factors, as well as the results of experimental determination of fatigue life and limit values [15].…”

Section: Data Sources and Systematization Of Fatigue Informationmentioning

confidence: 99%

“…The destruction of metals under cyclic loading is a statistical process. At the same level of applied stresses, the destruction of the material or some recorded parameter reaching a critical value, for example, the degree of damage to the surface microstructure, can occur over a different number of cyclic loadings [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Assessing and Forecasting Fatigue Strength of Metals and Alloys under Cyclic Loads

Kurkin,

Khrobostov,

Andreev

et al. 2024

Materials

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Within the scope of this research, patterns of changes in the fatigue life and limit of metals under cyclic stress were identified and the most informative parameters were determined as the basis for developing a method for the universal transformation of experimental data on the fatigue of metals and alloys for their subsequent generalization. Experimental data on metal fatigue, obtained by a large number of authors for a wide range of grades of steels and alloys, under the influence of various combinations of factors, were systematized. A generalized dependence of the recalculated parameters of fatigue life and limit was obtained, its characteristics were assessed, and a sensitivity analysis was performed, confirming the universal nature of the obtained dependence. A system of parameters has been proposed making it possible to consider and forecast high-cycle fatigue processes for a wide range of metals and alloys, under the conditions of various combinations of operating factors, from unified positions and a more general point of view.

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Section: Data Sources and Systematization Of Fatigue Informationmentioning

confidence: 99%

Section: Data Sources and Systematization Of Fatigue Informationmentioning

confidence: 99%

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Assessing and Forecasting Fatigue Strength of Metals and Alloys under Cyclic Loads

Kurkin,

Khrobostov,

Andreev

et al. 2024

Materials

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“…Changes in the hysteresis loop of materials subject to cyclic load have been reported in many papers, with most of the results inconsistent because of the fact that during the damage accumulation process, both the creation of crystal structure imperfections and crack propagation take place. Some researchers have associated an increase in hysteresis loop width (inelastic response of the material) with material damage accumulation . Damage caused by the movement of dislocations leading to the creation of new imperfections in crystal structure can exhibit a homogenising tendency in the stressed bulk of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers have associated an increase in hysteresis loop width (inelastic response of the material) with material damage accumulation. 15,16 Damage caused by the movement of dislocations leading to the creation of new imperfections in crystal structure can exhibit a homogenising tendency in the stressed bulk of the material. Crack propagation is, on the other hand, a local phenomenon, starting in a certain area of the material and developing from there.…”

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confidence: 99%

A fatigue damage indicator parameter for P91 chromium‐molybdenum alloy steel and fatigue pre‐damaged P54T carbon steel

Socha

Dietrich

2013

Fatigue Fract Eng Mat Struct

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A B S T R A C T Two grades of structural steel were subjected to fully reversible, constant stress amplitude cyclic loading. The local strain response of the material was measured and recorded during the test, with the applied testing technique enabling the monitoring of hysteresis loop variation for the narrowest cross-section of the hourglass specimen. Changes in hysteresis loop width, representing the local inelastic response of the material, were recorded in order to monitor the density of structural imperfections. Material ratcheting behaviour was observed as changes in the mean strain for selected load cycles. Ratcheting was attributed to local deformation of the material in the vicinity of imperfections such as voids or inclusions, as well as deformation induced by the propagation of microcracks. Definitions of a damage indicator parameter and damage parameter were proposed. The fatigue behaviour of the two investigated grades of steel was finally illustrated in the form of damage curves for different stress amplitudes and for undamaged and fatigue pre-damaged material.Keywords fatigue damage; inelastic strain; ratchetting; damage accumulation; damage parameter. N O M E N C L A T U R Ea = crack length D = damage parameter N, n = number of load cycle N f = number of cycles to failure R = cycle asymmetry ratio ε i = inelastic strain range for load cycle ε m = mean strain for load cycle φ = damage indicator parameter σ a = stress amplitude I N T R O D U C T I O NIn the two hundred years since fatigue in metal alloys was first investigated, 1 numerous studies have been carried out with the aim of identifying the physical phenomena underlying the accumulation of fatigue damage and leading to final failure of construction components. Although significant progress has been achieved, with the results of investigations published in many papers, the basic procedure for the estimation of fatigue life in construction components is still based on Wöhler's proposition. 1 This is because of the fact that observations of changes in internal structure have revealed the huge complexity of physical phenomena underlying fatigue damage accumulation. Many attempts have been made to relate identified phenomena to changes in the macroscopically observed mechanical properties of the investigated alloys. A summary regarding the elaborated damage models can be found in a number of review books 2 and papers. [3][4][5] Because finding relationships between changes in material mechanical characteristics and the physical phenomena underlying fatigue damage accumulation is very difficult, none of the mathematical models developed in this way have as yet been accepted by the engineering community for the estimation of component fatigue life.One obvious result of fatigue damage accumulation is the formation of dominant crack. The rapid development of fracture mechanics theory and testing methods have Correspondence: G. Socha.

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Fatigue and inelasticity of metals under nonuniform stressed state

Cited by 2 publications

References 18 publications

Assessing and Forecasting Fatigue Strength of Metals and Alloys under Cyclic Loads

Assessing and Forecasting Fatigue Strength of Metals and Alloys under Cyclic Loads

A fatigue damage indicator parameter for P91 chromium‐molybdenum alloy steel and fatigue pre‐damaged P54T carbon steel

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