Refinements on fracture toughness of PUR foams

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

doi:10.1016/j.engfracmech.2013.12.006

Cited by 88 publications

(49 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 74%

See 1 more Smart Citation

Shear and mode II fracture of PUR foams

Marșavina

Constantinescu

Linul

et al. 2015

Engineering Failure Analysis

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 74%

“…ða=R; S 1 =R; S 2 =RÞ; i ¼ I; II ð3Þ f I ðS 2 =RÞ ¼ 6:235 S 2 =R ð Þ 3 À 15:069 S 2 =R ð Þ 2 þ 17:229ðS 2 =RÞ À 1:062 f II ðS 2 =RÞ ¼ 1:884 S 2 =R À5:075ðS 2 =RÞ þ 1:983 ð4ÞRef [21,22]. SEC K i ¼ p max ðb; a=WÞ; i ¼ I; II ð5Þ f I ðb; a=WÞ ¼ cos b…”

mentioning

confidence: 99%

Shear and mode II fracture of PUR foams

Marșavina

Constantinescu

Linul

et al. 2015

Engineering Failure Analysis

Self Cite

View full text Add to dashboard Cite

“…The elastic properties Young modulus and Poisson ratio were determined by Impulse Excitation Technique (ASTM E-1876-01). Tensile strength was determined on dog bone specimens according with a gage length of 50 mm and a cross section in the calibrated zone with 10 mm width and 4 mm thickness, according to EN ISO 527, and described in the research published by Marsavina et al [28]. The mode I and II fracture toughness were determined on asymmetric semi-circular bend (ASCB) specimens.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…The dependence of K Ic = ffiffiffi ffi l c p on foam density, according to the SENB test results and the average cell sizes presented in [28], is plotted in Fig. 8 together with an approximation by a power-law relation based on Eq.…”

Section: Hole Effectmentioning

confidence: 99%

“…For a rough estimate of toughness of the neat foams, we resorted to the PUR foam test results reported in [28]. The foam density range considered in [28] covered the densities of interest, and the foams were almost isotropic, therefore, we employed the scaling relation [29] for the interpolation of toughness. According to [29], the mode I fracture toughness depends on foam density q as …”

Section: Hole Effectmentioning

confidence: 99%