Effect of strain rate, thickness, welding on the J–R curve for polyethylene pipe materials

EL-Bagory, Tarek M. A. A.; Sallam, Hossam El-Din M.; Younan, Maher Y. A.

doi:10.1016/j.tafmec.2014.09.008

Cited by 25 publications

(8 citation statements)

References 32 publications

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“…The methodology is explained in Appendix A. The fracture toughness J c which was used is issued from the literature . The intrinsic defect criterion we attempt to extend to thermoplastic polymers is based upon the knowledge of a SED function.…”

Section: Criterion Assessment In Biaxial Loadingmentioning

confidence: 99%

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A large‐strain intrinsic default‐based fracture criterion for polymers: assessment in biaxial loading and application to ageing

Sadeg

Naït-Abdelaziz

Zaïri

et al. 2017

Fatigue Fract Eng Mat Struct

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In this contribution, we attempt to give a general methodology allowing the fracture prediction of polymers under biaxial monotonic loading. Using the intrinsic defect concept, we assume that fracture at a macroscopic level is the consequence of the presence of defects at lower scales. We also assume that the fracture is governed by a macroscopic parameter, the strain energy release rate or the J‐integral. Intrinsic defect size, constitutive response and fracture toughness being the criterion inputs; the principal stretches at break can be therefore estimated for any biaxial and monotonic loading path. The proposed methodology includes the estimation of the J‐integral for any biaxial loading using a unified expression of this parameter which is a generalised form of that developed in the literature for uniaxial tension. Using different set of experimental data obtained in our team, the methodology is then successfully applied to various kinds of polymers: a natural rubber, a styrene‐butadiene rubber, a polyurethane, a thermoplastic elastomer and a high‐density polyethylene. We show also that such a methodology can be applied to predict the ageing effects on the stretches at break.

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Section: Criterion Assessment In Biaxial Loadingmentioning

confidence: 99%

“…The fracture toughness J c which was used is issued from the literature. 43 The intrinsic defect criterion we attempt to extend to thermoplastic polymers is based upon the knowledge of a SED function. Unfortunately, the thermoplastic-like mechanical behaviour is generally hyperelastic-viscoplastic.…”

Section: Assessment For Tpe and Hdpementioning

confidence: 99%

A large‐strain intrinsic default‐based fracture criterion for polymers: assessment in biaxial loading and application to ageing

Sadeg

Naït-Abdelaziz

Zaïri

et al. 2017

Fatigue Fract Eng Mat Struct

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“…Polymer pipes are increasingly used for various applications, such as the water, gas and high pressure containers industries. The use of polymer pipes under cruel environmental conditions can expose it to various types of damage, such as mechanical damage and cracks [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Repair of a Crack in an HDPE Pipe

Liamani¹

2021

Period. Polytech. Mech. Eng.

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A pipe is a buried or aerial pipeline carrying goods, whether in liquid or gaseous form. Pipes are most often made from polymer tubes. These pipes prove to be subject to damage caused by a lack of material or crack thus calling for methods of repair or reinforcement.The objective of this study is to analyze by finite element analysis the presence of a horizontal crack in a high-density polyethylene pipe subjected to patch-corrected internal loading.Part of this study is devoted to analyzing the Von Misses stress distribution along a horizontal line, the applied loading type effect, the orientation of the fibers and the nature of the patch have been highlighted.The second part of our study is based on the calculation of the J-Integral where the same parameters of the first part were considered.The results clearly show that the mechanical characteristics of the composite must be optimized to provide an effective repair safely and allow relief of stress concentrations at the crack front.

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“…In load bearing and engineering applications for both PP and PE, an improved understanding of fracture behavior along with general strength analysis is considered necessary as it provides information on the crack growth process in the materials that can be directly relevant to their performance in real-world conditions [12]. Fracture toughness measurements using different fracture mechanics approaches and the identification of crack propagation mechanisms have been investigated by previous researchers [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], both for PP and PE, with the research focusing on injection or other molding processes. This type of detailed material analysis is still absent for rotationally molded PE and PP however.…”

Section: Introductionmentioning

confidence: 99%

“…The J‐integral method was also used for LDPE and LLDPE . Similarly, fracture behavior analysis of HDPE pipes was also measured using J‐integral methods in previous work . Analysis of both the damage zone and fracture surface was used to identify the crack growth mechanism of PE .…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness of rotationally molded polyethylene and polypropylene

Saifullah¹,

Thomas

Cripps³

et al. 2017

Polymer Engineering & Sci

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In this work, the fracture toughness of rotationally molded polyethylene (PE) and polypropylene (PP) was measured using J integral methods at static loading rates and at room temperature. Two different commercially available rotational molding grades PE and PP were tested in this study which have been used in various rotationally molded products such as small leisure craft, water storage tanks, and so on. Scanning electron microscope (SEM), optical microscope, differential scanning calorimetry (DSC), solidstate nuclear magnetic resonance (solid-state NMR), and X-ray scattering were used to investigate the microstructure, fracture surfaces, and compare toughness properties of these materials. In PE, higher molecular weight and broader molecular weight distribution, larger amorphous and crystal region thicknesses are found to be related to higher toughness values. High molecular weight favors higher number of entanglements that improve fracture energy and broader distribution increases long chain branching of higher molecular weight fractions which creates higher entanglements at the branch sites. Larger amorphous regions promote microvoiding more easily compared to thinner amorphous regions, leading to greater plastic deformation and energy absorption. Higher crystal thickness also contributes to microvoiding in the amorphous region. For PP, greater plastic deformation observed in the fracture surfaces is related to higher fracture toughness values. POLYM. ENG. SCI., 58:63-73, 2018.

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Effect of strain rate, thickness, welding on the J–R curve for polyethylene pipe materials

Cited by 25 publications

References 32 publications

A large‐strain intrinsic default‐based fracture criterion for polymers: assessment in biaxial loading and application to ageing

A large‐strain intrinsic default‐based fracture criterion for polymers: assessment in biaxial loading and application to ageing

Modeling the Repair of a Crack in an HDPE Pipe

Fracture toughness of rotationally molded polyethylene and polypropylene

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