Stress Intensity Factor K I and T-Stress Determination in HDPE Material

Bouchelarm, Mohammed A.; Mazari, Mohamed; Benseddiq, Noureddine

doi:10.1007/s11668-017-0322-3

Cited by 11 publications

(2 citation statements)

References 71 publications

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“…In both cases, a crack should form and grow in the bulk or at the interface, respectively. The mechanism of crack growth in polymer materials has been discussed extensively in the literature 49–52 . In this process, two main energy dissipating mechanisms are involved 53 : (a) chain pull out and breakage and (b) bulk viscoelastic energy dissipation.…”

Section: Resultsmentioning

confidence: 99%

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Aghkand

Saffar

Ajji

2021

J of Applied Polymer Sci

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This work studies effects of back‐layer materials, thickness of sealant layer, and sealing condition on seal performance of multilayer polyethylene‐based films. Multilayer films with back‐layers of high‐density polyethylene (HDPE), or low‐density polyethylene (LDPE), or linear low‐density polyethylene (LLDPE) were produced with different thicknesses of the metallocene layer. It was found that increasing the thickness of the metallocene layer improved hot tack properties. In addition, films with back‐layers of LLDPE or LDPE showed higher hot tack strength compared to those with HDPE back‐layer. Increasing sealing temperature reduced significantly the hot tack strength and its dependency on metallocene layer thickness. It was found that increasing delay time after sealing, before peeling test, increased hot tack strength, but the rate of hot tack evolution and the type of peeling behavior were considerably affected by the type of back‐layer material. The effect of dwell time was also examined, and it was observed that increasing dwell time in the studied range did not affect the hot tack evolution. The mechanisms involved in the development of hot tack evolution were discussed, and it was shown that the back‐layer effects can be explained by bulk viscoelastic energy dissipation theory.

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Section: Resultsmentioning

confidence: 99%

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Aghkand

Saffar

Ajji

2021

J of Applied Polymer Sci

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“…The hydrostatic test subjects the pipes to elevated internal pressures to assess their strength and integrity under simulated operating conditions, whereas extrapolation techniques are subsequently applied to analyze the hydrostatic strength test data, aiding in the estimation of the pipes' behavior over extended periods. While hydrostatic tests are useful in assessing the overall strength of the pipe, they do not provide any information on pre-existing cracks, making it necessary to develop fracture mechanics models to study the susceptibility of PE pipes to crack propagation [19][20][21][22]. By quantifying the crack growth rate and estimating the time to failure, these models aid in developing effective maintenance strategies of pipelines [23].…”

Section: Introductionmentioning

confidence: 99%

Guided Wave Ultrasonic Testing for Crack Detection in Polyethylene Pipes: Laboratory Experiments and Numerical Modeling

Shah,

El-Hawwat,

Wang

2023

Sensors

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The use of guided wave-based Ultrasonic Testing (UT) for monitoring Polyethylene (PE) pipes is mostly restricted to detecting defects in welded zones, despite its diversified success in monitoring metallic pipes. PE’s viscoelastic behavior and semi-crystalline structure make it prone to crack formation under extreme loads and environmental factors, which is a leading cause of pipeline failure. This state-of-the-art study aims to demonstrate the potential of UT for detecting cracks in non-welded regions of natural gas PE pipes. Laboratory experiments were conducted using a UT system consisting of low-cost piezoceramic transducers assembled in a pitch-catch configuration. The amplitude of the transmitted wave was analyzed to study wave interaction with cracks of different geometries. The frequency of the inspecting signal was optimized through wave dispersion and attenuation analysis, guiding the selection of third- and fourth- order longitudinal modes for the study. The findings revealed that cracks with lengths equal to or greater than the wavelength of the interacting mode were more easily detectable, while smaller crack lengths required greater crack depths for detection. However, there were potential limitations in the proposed technique related to crack orientation. These insights were validated using a finite element-based numerical model, confirming the potential of UT for detecting cracks in PE pipes.

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Assessment of Mode I and Mode II Stress Intensity Factors Obtained by Displacement Extrapolation and Interaction Integral Methods

Ahangar

Verreman

2018

J Fail. Anal. and Preven.

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Stress Intensity Factor K I and T-Stress Determination in HDPE Material

Cited by 11 publications

References 71 publications

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Guided Wave Ultrasonic Testing for Crack Detection in Polyethylene Pipes: Laboratory Experiments and Numerical Modeling

Assessment of Mode I and Mode II Stress Intensity Factors Obtained by Displacement Extrapolation and Interaction Integral Methods

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