Experimental and numerical assessment of thermal fatigue in 316 austenitic steel pipes

Paffumi, Elena; Karl-Fredrik, Nilsson; Száraz, Zoltán

doi:10.1016/j.engfailanal.2014.01.010

Cited by 29 publications

(15 citation statements)

References 13 publications

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“…Compared to N&R definition of K in Equation 12, the term is not presented in the general definition of K described in Equation (19). It must be noted that the term originally comes from the theory of the stress intensity factor of "embedded elliptical" crack in an "infinite solid" under tension.…”

Section: Stress Intensity Factor and Shape Function Calculationmentioning

confidence: 99%

“…Moreover, Miyamoto and Miyoshi [15] and Tan and Fenner [16] investigated stress intensity factor solutions for a semi-elliptical crack, in a finite plate using the finite element method and in pressurised cylinders using boundary integral equation method, respectively. Although various researchers have experimentally investigated the fatigue crack growth behaviour in hollow cylindrical structures with circumferential semi-elliptical cracks at the outer surface [17][18][19][20] , the only relevant fracture mechanics shape function and SIF solutions available to analyse experimental data for such geometry are those proposed by J.C. Newman & I.S. Raju (N&R) in 1986 [21].…”

Section: Introductionmentioning

confidence: 99%

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New shape function solutions for fracture mechanics analysis of offshore wind turbine monopile foundations

2018

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Offshore wind turbines are considered one of the most promising solutions to provide sustainable energy. The dominant majority of all installed offshore wind turbines are tied up to the seabed using monopile foundations. To predict the lifetime of these structures, reliable values for shape function and stress intensity factor are needed. In this study, finite element simulations have been performed for a wide range of monopile geometries with different dimensions, crack lengths as well as depths to evaluate shape function and stress intensity factor solutions for monopiles and an empirical equation is developed. The new solutions have been verified through comparison with the existing solutions provided by Newman & Raju for small hollow cylinders. The empir ical shape function solutions developed in this study are employed in a case study and the results have been compared with the existing shape function solutions. It is found that the old solutions provide inaccurate estimations of fatigue crack growth in monopiles and they underestimate or overestimate the fatigue life depending on the shape function solution employed in the structural integrity assessment. The use of the new solution will result in more accurate monopile designs as well as life predictions of existing monopile structures.

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Section: Stress Intensity Factor and Shape Function Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New shape function solutions for fracture mechanics analysis of offshore wind turbine monopile foundations

2018

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“…Most researchers deal with thermal fatigue as a special case of isothermal fatigue. Many researchers have worked on numerical simulation models [41][42][43] to create better understanding of thermo-mechanical stresses which are produced during the process and are responsible for failure of components.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of thermal fatigue behavior in a cracked disc of AISI H-11 tool steel

Qayyum

Shah

Shakeel

et al. 2016

Engineering Failure Analysis

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“…Thermal fatigue experiments generally consist in continuously heating a thick specimen up to a constant temperature, inside a furnace [4] [12] or by Joule effect [17], and then prescribing cyclic thermal gradients by projections of thermal sprays of demineralized water or hot and cold sodium [5] [6]. Alternatively, cyclic thermal gradients can be prescribed with induction coils on tubular specimens by varying the external heat flux while the internal surface of the tube is continuously cooled by flowing water [7] [21]. However, these thermal loading methods may experience some spatial and temporal fluctuations of the heating/cooling sources, which limit the capacity to precisely identify the thermal loading responsible for crack initiation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Crack initiation and propagation under thermal fatigue of austenitic stainless steel

Wang

Charbal

Hild

et al. 2019

International Journal of Fatigue

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Thermal fatigue tests on AISI 316L(N) austenitic stainless steel samples are performed through pulsed laser on specimen that can be subjected to an additional static mechanical load. These tests are carried out in Helium environment with a dedicated and heavily instrumented setup , FLASH. The fatigued surface is monitored by a hybrid multiview system composed of two visible light and one infrared cameras that, through 3D-registration, provides in-situ access to the 3D surface displacement fields and 2D temperature fields. At a fatigue frequency of 1 Hz, the surface temperature range covered per cycle can be varied from 150°C to 250°C, conditions that allow surface damage to be reproduced. The multiview system reveals the time-resolved mechanisms of surface damage, from significant cyclic plasticity with persistent slip bands to micro-crack initiation and growth, leading to their quantitative characterization (micro-crack density, length of major crack, orientation) all along the test. These observations are confirmed at a few check points where the test is interrupted for optical microscopy inspection of the surface. Finally, the thermal fatigue data are compared to purely mechanical isothermal uniaxial fatigue data through the use of an equivalent strain, and an excellent (and conservative) agreement is obtained.

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Experimental and numerical assessment of thermal fatigue in 316 austenitic steel pipes

Cited by 29 publications

References 13 publications

New shape function solutions for fracture mechanics analysis of offshore wind turbine monopile foundations

New shape function solutions for fracture mechanics analysis of offshore wind turbine monopile foundations

Numerical simulation of thermal fatigue behavior in a cracked disc of AISI H-11 tool steel

Crack initiation and propagation under thermal fatigue of austenitic stainless steel

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