Some advantages derived from the use of the strain energy density over a control volume in fatigue strength assessments of welded joints

Lazzarin, P.; Berto, Filippo; Gómez, Fernando Calle; Zappalorto, Michele

doi:10.1016/j.ijfatigue.2007.10.012

Cited by 184 publications

(120 citation statements)

References 34 publications

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“…Such a method has been extensively used in the literature and its power, especially when dealing with fatigue of notched components, has been largely proofed, e.g. by (Lazzarin and Berto, 2005;Lazzarin et al, 2010Lazzarin et al, , 2008Lazzarin et al, , 2001Torabi, 2013aTorabi, , 2013bTorabi, , 2013c. A review of the method has been presented in .…”

Section: A Synthesis In Terms Of Linear Elastic Sed Averaged Over a Cmentioning

confidence: 99%

Extension of linear elastic strain energy density approach to high temperature fatigue and a synthesis of Cu-Be alloy experimental tests

Berto¹,

Gallo²

2015

10.5267/j.esm

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The present paper summarizes the results from uniaxial-tension stress-controlled fatigue tests performed at different temperatures up to 650°C on Cu-Be specimens. Two geometries are considered: hourglass shaped and plates weakened by a central hole (Cu-Be alloy). The motivation of the present work is that, at the best of authors' knowledge, only a limited number of papers on these alloys under high-temperature fatigue are available in the literature and no results deal with notched components. The Cu-Be specimens fatigue data are re-analyzed in terms of the mean value of the Strain Energy Density (SED) averaged over a control volume. Thanks to the SED approach it is possible to summarize in a single scatter-band all the fatigue data, independently of the specimen geometry.

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Section: A Synthesis In Terms Of Linear Elastic Sed Averaged Over a Cmentioning

confidence: 99%

Extension of linear elastic strain energy density approach to high temperature fatigue and a synthesis of Cu-Be alloy experimental tests

Berto¹,

Gallo²

2015

10.5267/j.esm

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“…The criterion states that brittle fracture failures occur when the strain energy density averaged in a circular control volume of radius R c , which surrounds a crack or notch tip, reaches a critical value W c dependent on the material. The robustness of this criterion has been proved by several works on different notches geometries and on different loading conditions [21][22][23][24][25][26][27]. The main purpose of this work is to evaluate the effectiveness of SED criterion on PUR foams, aiming to experimentally evaluate the main parameters of this method, i.e.…”

Section: Introductionmentioning

confidence: 99%

Local strain energy density for the fracture assessment of polyurethane specimens weakened by notches of different shape

Peron

Razavi

Berto

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. Recent studies on local stress fields in proximity of crack and notch tips have shown that Strain Energy Density (SED), averaged in a circular control volume surrounding the point of stress singularities, represents a reliable engineering approach for assessing the brittle fracture of several brittle materials. It is worthy of notice that the application of SED criterion and the reliability of its results are strictly related to the proper determination of fracture parameters, i.e. the critical value of deformation energy W c and the radius R c of the control volume. This work presents an experimental methodology for their determination by means of notched specimens for different polyurethane densities, ranging from 100 to 651 kg/m 3 . Then, once obtained these critical parameters, the failure load in different types of notches and cracked specimens under mode I have been predicted. Moreover, for cracked specimens under mixed mode and mode II, the authors propose a personal approach that confirms PUR foams can be treated as brittle materials KEYWORDS. Strain Energy Density; PUR foams; Tensile fracture; Critical radius; Fracture parameters.Citation: Peron, M., Razavi, S.M.J., Berto, F. Torgersen, J., Marsavina, L., Local strain energy density for the fracture assessment of polyurethane specimens weakened by notches of different shape, Frattura ed Integrità Strutturale, 42 (2017) 214-222.

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“…More than that, it is possible to take into account the terms of the order of more than distributions of stress, which are not taken into account in his solutions Williams, such as T-stress ) and effects and threedimensional singularities out-of-plan (Berto and Lazzarin, 2014;Berto and Lazzarin, 2009). Finally, the EDI value in a volume control can be determined with great accuracy using mesh coarse, as opposed to the evaluation of the NSIFs, which needs mesh very fine (Lazzarin et al, 2010;2008a;). According to this criterion, insufficient fatigue appears when the average value of the SED calculated in a volume cylindrical sector of the radius r0 around the top notch reach a value critical.…”

Section: Introductionmentioning

confidence: 99%

A Review of the Fatigue Strength of Load Carrying Shear Welded Joints

Berto¹,

Gagani²,

Petrescu³

et al. 2017

American Journal of Engineering and Applied Sciences

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In the study it is shown an overview of the latest results of two types of joints of the load carrying welded shear. Tests of fatigue have been carried out on the two solutions specific design features proposed and with the aim of improving the resistance of the joints under cycling loading. By hiring the 3D models, was determined Strain Energy Density (SED), in a volume of control which surrounds the lowest point of interest. All of the experimental results have been presented in short. The synthesis shows that all data are within the range of the scattering of the proposed previously in the specialized literature for steel construction welded.

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Some advantages derived from the use of the strain energy density over a control volume in fatigue strength assessments of welded joints

Cited by 184 publications

References 34 publications

Extension of linear elastic strain energy density approach to high temperature fatigue and a synthesis of Cu-Be alloy experimental tests

Extension of linear elastic strain energy density approach to high temperature fatigue and a synthesis of Cu-Be alloy experimental tests

Local strain energy density for the fracture assessment of polyurethane specimens weakened by notches of different shape

A Review of the Fatigue Strength of Load Carrying Shear Welded Joints

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