Evaluation of Mixed Mode Fracture for PUR Foams

Marșavina, Liviu; Constantinescu, Dan Mihai; Linul, Emanoil; Voiconi, Tudor; Apostol, Dragoş Alexandru; Sadowski, Tomasz

doi:10.1016/j.mspro.2014.06.217

Cited by 27 publications

(12 citation statements)

References 21 publications

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“…The mode I and II fracture toughness were determined on asymmetric semi-circular bend (ASCB) specimens. A detailed description of these tests is presented in [29,30]. The experimentally values of elastic, mechanical and fracture toughness properties are presented in Tab.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…For mixed mode loading the Richard fracture criterion [20] gives better predictions of fracture limit and crack initiation angle. Marsavina et al [21,22] assess the mixed mode fracture criteria of three different densities of PUR foams and found that the Equivalent Stress Intensity Factor fits better the experimental results obtained using Asymmetric Semi-Circular Bend (ASCB) specimen. This study presents results on the elastic and mechanical properties in shear of polyurethane foams and the mode I and mode II fracture toughness.…”

Section: Introductionmentioning

confidence: 94%

“…9c was also used to perform mode I, mode II and mixed mode fracture toughness tests [21,28,29]. This semi-circular specimen with radius R, which contains an edge crack of length a oriented normal to the specimen edge, loaded with a three point bend fixture, was proved to give a wide range of mixed modes from pure mode I (S 1 = S 2 ) to pure mode II (S 1 -S 2 ), only by changing the position of one support.…”

Section: Influence Of Density and Specimen Typementioning

confidence: 99%

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Shear and mode II fracture of PUR foams

Marșavina

Constantinescu

Linul

et al. 2015

Engineering Failure Analysis

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“…For example, four fracture criteria (maximum circumferential tensile stress, minimum strain energy density, maximum energy release rate, equivalent stress intensity factor) have been applied to evaluate the mixed mode fracture of polyurethane foams using asymmetric semi-circular specimens [1]. In another work [2], the Theory of Critical Distances (TCD) has been applied to investigate the fracture properties of polyurethane materials.…”

Section: Introductionmentioning

confidence: 99%