A microstructure based approach to model effects of surface roughness on tensile fatigue

Singh, Kunwarjeet; Sadeghi, Farshid; Correns, Martin; Blass, Toni

doi:10.1016/j.ijfatigue.2019.105229

Cited by 35 publications

(9 citation statements)

References 44 publications

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“…Much research on the fatigue behavior of superalloys revealed that surface roughness has a strong influence on fatigue life, 4–6 especially when high cycle fatigue is considered. Stress concentration introduced by the rough surface significantly affects the fatigue lives of the materials 7–13 . In addition, surface stress caused by surface oxides may also lead to surface crack initiation 14 .…”

Section: Introductionmentioning

confidence: 99%

“…Stress concentration introduced by the rough surface significantly affects the fatigue lives of the materials. [7][8][9][10][11][12][13] In addition, surface stress caused by surface oxides may also lead to surface crack initiation. 14 Although the original cast components might have different surface states and internal microstructures as a result of a unique manufacturing process such as the thin structures in the current work that resemble contemporary high-pressure turbine blades, there is no open literature discussing the fatigue of these components.…”

Section: Introductionmentioning

confidence: 99%

“…The local stress concentration is very serious when the surface roughness values of the specimen are very high. 4 To study the influence of surface roughness on fatigue life, researchers used different methods to quantify surface roughness, such as Voronoi tessellation, 11 the 3D surface quality indexes, 27 and the empirical formula. 5,28,29 Wan et al 6 found that the fatigue strength of the specimens with a rough surface declined by 50% compared with that of smooth specimens and quantified the surface roughness as the stress concentration factor K t .…”

Section: Introductionmentioning

confidence: 99%

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Thermomechanical fatigue of round tube specimens manufactured by precision directional solidification casting method

Song

Shen

Teng

et al. 2022

Fatigue Fract Eng Mat Struct

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In the present study, a superalloy round tube specimen prepared by directional precision casting without mechanical turning is experimentally investigated under the thermomechanical fatigue conditions of the in-phase and out-ofphase thermomechanical angels from 500 C to 1000 C. The deformation behavior and damage mechanism of the round tube specimens under TMF load are discussed. It was confirmed that the tension-compression asymmetry under TMF cycling is affected by temperature-load phasing and mechanical strain range. Moreover, the damage to round tube specimens includes creep, fatigue and oxidation. Due to the concentrated stress, the rough surface of the specimen provides suitable locations for crack initiation. A novel life prediction approach that combines the Neu-Sehitoglu model and modified Manson-Coffin model was proposed in response to the traditional life model's insufficient prediction performance. This method may explain the TMF life of precision cast specimens.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermomechanical fatigue of round tube specimens manufactured by precision directional solidification casting method

Song

Shen

Teng

et al. 2022

Fatigue Fract Eng Mat Struct

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“…It is well-known that the fatigue life is also sensitive to geometric discontinuity such as notch. This topic has already been studied (e.g., Deng et al, 2015;Ferjaoui et al, 2015;Kumar et al, 2018;Singh et al, 2019;Zhan et al, 2017). Recently, investigated the effect of micro-notch size on crack initiation in LCF from an experimental and numerical perspective.…”

Section: Introduction and General Scopementioning

confidence: 99%

Continuum damage model for low-cycle fatigue of metals: An overview

Abdul–Latif

2021

International Journal of Damage Mechanics

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This work aims to give a comprehensive and accurate view of those micromechanical models that have been developed over the past two decades by our research team. We hereby refer to the distinct capabilities and theoretical difficulties of such models published in various journals by discussing them in a more integrated manner. We also believe that our community can find a significant benefit from this work through below mentioned discussions, which answer many of the questions asked by researchers and those interested in this field. Returning to this work topic, the low-cycle fatigue (LCF) life is highly affected by microstructural instabilities, inhomogeneity and shear bands formation. The first type of damage is related to the nuclei of fatigue microcracks, for several FCC and BCC metals generally governed by continuous irreversible slips within the intensive slip bands. The second type of damage concerns ductile damage caused by cavitation induced by plastic strain and hydrostatic stress. Thereby, fatigue-failure is a relevant topic that requires further explanations to better understand the plausible damaging mechanisms of microcracks and/or microvoids at lower levels of observation. To model the microcracks initiation, some attempts were conducted via micromechanical models assuming, for example, that the microcracks initiate at the crystallographic slip system level describing the LCF response of metals under simple and complex loading paths. In this overview, the latest development of mixed approach with double character called Micromechanical Determinist-Probabilistic Model (MDPM) coupled with damage will be presented with its generalized structure.

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“…A main motivation to carry out this research work is that no studies have been developed concerning the effect of pre-corrosion on the fatigue endurance, under conventional and ultrasonic tests, on this aeronautical aluminum alloy. Concerning surface roughness, fatigue life has been studied in a carbon steel, showing that this superficial parameter influences fatigue life only during crack initiation Metals 2020, 10, 1033 2 of 17 stage [14]; others investigations [15,16], have referred that fatigue life is reduced with the increase of roughness. In this study, the roughness has been registered before and after the conventional fatigue tests, in order to record its variation.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic and Conventional Fatigue Endurance of Aeronautical Aluminum Alloy 7075-T6, with Artificial and Induced Pre-Corrosion

Tello

Milković

Almaraz

et al. 2020

Metals

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Ultrasonic and conventional fatigue tests were carried out on the AISI-SAE AA7075-T6 aluminum alloy, in order to evaluate the effect of artificial and induced pre-corrosion. Artificial pre-corrosion was obtained by two hemispherical pitting holes of 500-μm diameter at the specimen neck section, machined following the longitudinal or transverse direction of the testing specimen. Induced pre-corrosion was achieved using the international standard ESA ECSS-Q-ST-70-37C of the European Space Agency. Specimens were tested under ultrasonic fatigue technique at frequency of 20 kHz and under conventional fatigue at frequency of 20 Hz. The two applied load ratios were: R = −1 in ultrasonic fatigue tests and R = 0.1 in conventional fatigue tests. The main results were the effects of artificial and induced pre-corrosion on the fatigue endurance, together with the surface roughness modification after the conventional fatigue tests. Crack initiation and propagation were analyzed and numeric models were constructed to investigate the stress concentration associated with pre-corrosion pits, together with the evaluation of the stress intensity factor in mode I from crack initiation to fracture. Finally, the stress intensity factor range threshold ΔKTH was obtained for the base material and specimens with two hemispherical pits in transverse direction.

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A microstructure based approach to model effects of surface roughness on tensile fatigue

Cited by 35 publications

References 44 publications

Thermomechanical fatigue of round tube specimens manufactured by precision directional solidification casting method

Thermomechanical fatigue of round tube specimens manufactured by precision directional solidification casting method

Continuum damage model for low-cycle fatigue of metals: An overview

Ultrasonic and Conventional Fatigue Endurance of Aeronautical Aluminum Alloy 7075-T6, with Artificial and Induced Pre-Corrosion

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