A fracture mechanics approach for the prediction of the failure time of polybutene pipes

Andena, Luca; Rink, M.; Frassine, R.; Corrieri, R.

doi:10.1016/j.engfracmech.2009.10.002

Cited by 22 publications

(13 citation statements)

References 10 publications

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“…The surface of dimples alternated between microductile and a rather smooth appearance, which might be an indication of a step-wise crack growth, as also suspected in Ref. [25]. Contrary to findings in literature, PVC-U showed no formation of discernible striations [17,33,34].…”

Section: Discussioncontrasting

confidence: 50%

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Cyclic tests on cracked round bars as a quick tool to assess the long term behaviour of thermoplastics and elastomers

et al. 2015

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Section: Discussioncontrasting

confidence: 50%

“…This could be an indication of a step-wise crack growth, as indicated in Ref. [25]. Closer to the centre of the specimen the appearance changes into a rather smooth surface at the end of the last dimples with a sharp transition.…”

Section: Resultsmentioning

confidence: 91%

Cyclic tests on cracked round bars as a quick tool to assess the long term behaviour of thermoplastics and elastomers

et al. 2015

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“…Too small a ligament length hinders the full development of the plastic zone around the crack tip, and thus reducing the fracture resistance. A similar effect has been previously reported for other polymeric materials [11][12]. To avoid the need for samples of excessive size -in view of making them out of the thermoformed product -the use of SEN(T) configuration was preferred.…”

Section: Fracture Testsmentioning

confidence: 89%

Effect of processing on the environmental stress cracking resistance of high-impact polystyrene

et al. 2016

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Processing conditions have a strong effect on the final mechanical properties of products made of polymeric materials. Relevant phenomena most commonly include thermal stresses, physical ageing, frozen-in strains and molecular orientation. In this work, two different high-impact polystyrenes, processed by thermoforming, were considered: a "standard" one and a grade specifically resistant to Environmental Stress Cracking (ESC). The main effect induced by thermoforming was molecular orientation. The local degree of orientation was measured on a thermoformed product and its effect on the material ESC behavior in sunflower oil was studied. A Fracture Mechanics approach was applied to evaluate the fracture resistance of the two materials.Results show that a higher degree of orientation increases the fracture resistance in air but has no effect on the (expectedly lower) resistance in the active oil environment.

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“…This approximation, which constitutes the basis of the so-called pseudo-elastic approach, was found to be adequate to describe the behaviour of a variety of polymeric materials, among which were also some nonlinear viscoelastic materials. For instance, and were used for the analysis of the Slow Crack Growth (SCG) and Environmental Stress Cracking (ESC) of several polymers (Williams and Marshall, 1975;Frassine et al, 1996;Kamaludin et al, 2017), including: -toughened polymethyl methacrylate (Mariani et al, 1996;Pini et al, 2018) -high impact polystyrene (Andena et al, 2013(Andena et al, , 2016Kamaludin et al, 2016) -polybutene (Andena et al, 2009) -polyethylene (Chan and Williams, 1983;Brown, 1986, 1987;Chang and Donovan, 1989;Rink et al, 2003;Frank, Pinter and Lang, 2009;Contino et al, 2016Contino et al, , 2018Kamaludin et al, 2016) Assumptions on the validity of these two fracture parameters and of Equation (1) are supported by the accurate description of the fracture behaviour of the polymers considered in these works.…”

Section: Introductionmentioning

confidence: 99%

A comparison between $K$ and $G$ approaches for a viscoelastic material: the case of environmental stress cracking of HDPE

Contino

Andena

Valle

et al. 2019

Mech Time-Depend Mater

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According to Linear Elastic Fracture Mechanics the stress intensity factor and the energy release rate are two fracture parameters linked by the elastic modulus and Poisson's ratio of the considered material. This concept has been extended to the analysis of linear viscoelastic materials, by introducing time-dependent quantities; it is also used for nonlinear viscoelastic polymers, even if its accuracy in this case is still an open question. In this work the Slow Crack Growth and the Environmental Stress Cracking resistance of two highdensity polyethylene grades were investigated, differing for their molecular weight distribution and fracture resistance. The description of the fracture behaviour of the two materials provided by the stress intensity factor or the energy release rate turned out to be equivalent, despite the nonlinear mechanical behaviour exhibited by the two polymers. Moreover, a time-dependent effective modulus, related to the two fracture parameters, was evaluated: its value was in good agreement with the modulus experimentally determined from tensile tests. A constant relevant effective strain was found despite the different testing conditions (i.e. applied mechanical loading, temperature and presence of an active environment), its value being equal for the two considered polyethylenes.

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A fracture mechanics approach for the prediction of the failure time of polybutene pipes

Cited by 22 publications

References 10 publications

Cyclic tests on cracked round bars as a quick tool to assess the long term behaviour of thermoplastics and elastomers

Cyclic tests on cracked round bars as a quick tool to assess the long term behaviour of thermoplastics and elastomers

Effect of processing on the environmental stress cracking resistance of high-impact polystyrene

A comparison between $K$ and $G$ approaches for a viscoelastic material: the case of environmental stress cracking of HDPE

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