Fatigue resistance of pipe-to-plate welded joint under in-phase and out-of-phase combined bending and torsion

Frendo, Francesco; Bertini, Leonardo

doi:10.1016/j.ijfatigue.2015.04.020

Cited by 29 publications

(20 citation statements)

References 11 publications

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“…A similar curve was obtained by the authors in Marulo et al 45 by using a 1‐mm fictitious radius at all the three weld notches. By comparing the present curve (Figure 5) with the one obtained in Frendo and Bertini, 39 it can be observed that, as it can be reasonably expected, the endurance curve depends on the radius used in the FE model.…”

Section: Analysis Of Results: Fatigue Life Assessmentmentioning

confidence: 99%

“…Tests were performed thanks to the in‐house developed test bench shown in Figure 1 (right) and described in Frendo and Beritini 39 . The bench is composed of two independently controlled hydraulic actuators connected on the opposite sides of a loading arm, which is bolted to the upper part of the specimen.…”

Section: Experimental Activitymentioning

confidence: 99%

“…For the torsion blocks the nominal shear stress amplitude τ a,n = 72.5 MPa ( Δτ n = 145 MPa) was selected, in order to have a normal to shear stress ratio equal to σ n / τ n = 0.88; this allows a comparison of the obtained results with previously published data by the authors 39,42 . For the selected shear stress, the expected endurance is equal to N t = 10.2·10 5 cycles (Figure 2), and, therefore, the fatigue life fractions of D i = 0.3 and D i = 0.45 resulted in block lengths of n t,0.3 = 3.06·10 5 and n t,0.45 = 4.59·10 5 , respectively.…”

Section: Experimental Activitymentioning

confidence: 99%

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Fatigue life assessment of welded joints under sequences of bending and torsion loading blocks of different lengths

Frendo

Marulo

Chiocca

et al. 2020

Fatigue Fract Eng Mat Struct

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In this work, the nominal stress concept, the notch stress approach and two critical plane approaches are used to analyse the fatigue endurance of a pipeto-plate welded joint subjected to complex loading histories. Both the pipe and the plate were made of S355JR steel. Starting from already known fatigue endurance curves obtained for the same specimens under pure bending and pure torsion, a first series of tests was conducted, in which specimens were loaded in bending for a given fraction of the estimated life and then in torsion until failure. A similar series of tests was then carried out by changing the loading order: specimens were firstly loaded in torsion for a given fraction of the estimated endurance and then in bending until failure. The whole test campaign was repeated for two different fractions of the estimated life, that is, 0.3 and 0.45, respectively. After that, additional three series of tests were carried out, in which the specimens were subjected to consecutive sequences of bending and torsion blocks of different lengths (short, medium and long, respectively); the relative length of the bending and torsion block in each series was determined in order to produce the same damage. The experimental results, in terms of total damage at failure, were analysed using the Palmgren-Miner hypothesis. For all the assessment methods, the characteristic endurance curves were firstly calibrated on the basis of finite element (FE) analyses and of the experimental results obtained under pure bending and pure torsion loadings. The observed damage at failure resulted always greater than 0.5 for all the employed methods and greater than 1 for most of the tests. The different methods gave similar results, with the critical plane methods giving a slightly more stable damage at failure and a correct determination of the failure location. For all the methods, the damage at failure slightly reduces as the block length shortens. K E Y W O R D Scritical plane, loading blocks, multiaxial fatigue, nominal stress, notch stress, welded joints

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Section: Analysis Of Results: Fatigue Life Assessmentmentioning

confidence: 99%

Section: Experimental Activitymentioning

confidence: 99%

Section: Experimental Activitymentioning

confidence: 99%

See 1 more Smart Citation

Fatigue life assessment of welded joints under sequences of bending and torsion loading blocks of different lengths

Frendo

Marulo

Chiocca

et al. 2020

Fatigue Fract Eng Mat Struct

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“…The specimen (of steel grade S355JR) was composed of a tube with an internal diameter of 44 mm and a thickness of 10 mm, which was joined by seam welding to a square plate with side length of 190 mm and a thickness of 25 mm. Four holes with a diameter of 21 mm were drilled in the plate corners as well as one 10 mm hole in the centre of the plate to make it possible to carry out fatigue tests ( [17][18][19]). Furthermore, a reinforcement was placed inside the tube at a distance of 15 mm from the plate surface.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Heat Sources for the Simulation of the Temperature Distribution in Gas Metal Arc Welded Joints

Chiocca

Frendo

Bertini

2019

Metals

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Residual stresses can affect both the static strength and the fatigue endurance of welded joints. Residual stresses can be assessed by numerical simulation; however, the simulation of the welding process is a complex task that requires knowledge of several parameters, many of which can only be estimated with some uncertainty. The reduction in the number of these parameters can lead to a more feasible and efficient study. In this work, the finite element method is used to assess the capability of different thermal methods used to simulate a single pass of the gas metal arc welding process in reproducing the temperature distribution around the weld. Results of the simulations are compared to experimental measurements of the surface temperature close to the welding area. The thermal techniques analyzed adopt different levels of complexity, from the basic implementation of a constant initial temperature assigned to a given material volume, to the more comprehensive and widespread Goldak's double-ellipsoid model. The study shows that, close to the weld seam, very similar thermal behaviors can be achieved by employing each one of the analyzed methods. Secondly, considering the constant initial temperature method, the comparison between experimental measurements and numerical simulations showed a fairly good agreement, suggesting that a relatively simple method (i.e., requiring the setting of only one parameter) can be used to efficiently reproduce the thermal history of a welding process.

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“…A wider range of load capacity also allowed for increasing the type of specimens and loads used. Other authors [18] present the fatigue resistance of a pipe-to-plate welded joint, which was investigated under combined in-phase and out-of-phase bending and torsion. The pipe and plate were made of S355 steel and the joint was not subjected to any after welding relieve treatment.…”

Section: The Combination Of Bending and Torsionmentioning

confidence: 99%

Fatigue Testing Machines and Apparatus

Macek¹,

Zawiślak²,

Deptuła³

et al. 2019

QPI

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This paper presents selected examples of construction and applications of fatigue test stands. The authors made a review of universal fatigue machines and test stands, made specifically for own and individual programs to research fatigue material properties. The publication contains the developed procedures to determine the fatigue life of materials. The authors also describe how to implement these procedures to control and measurement systems in research stands. The article briefly reviews the history of the development of fatigue testing methods, with respect to industrial needs. Moreover, it presents selected examples of solutions and applications systems for fatigue testing, available in scientific Słowa kluczowe: fatigue machine, test stand, stress, strain, fatigue test design 1 Dr inż., Przedsiębiorstwo Techniczne Energopiast Sp. z o.o., Poland,

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Fatigue resistance of pipe-to-plate welded joint under in-phase and out-of-phase combined bending and torsion

Cited by 29 publications

References 11 publications

Fatigue life assessment of welded joints under sequences of bending and torsion loading blocks of different lengths

Fatigue life assessment of welded joints under sequences of bending and torsion loading blocks of different lengths

Evaluation of Heat Sources for the Simulation of the Temperature Distribution in Gas Metal Arc Welded Joints

Fatigue Testing Machines and Apparatus

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