Quantitative assessment of deformation-induced damage in polyethylene pressure pipe

Zhang, Yi; Jar, P.‐Y. Ben

doi:10.1016/j.polymertesting.2015.08.005

Cited by 29 publications

(6 citation statements)

References 44 publications

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“…The larger stress values determined from MD simulation than those measured from experimental testing are partially due to the differences in strain rates attainable by MD simulation compared to experimental rates. But the general trend of the stress–strain curves are the same as those reported in real mechanical tests 18,54 and MD tension simulation. 14,55…”

Section: Resultssupporting

confidence: 78%

“…13–17 From a macro perspective, for example, the stress–strain relationship of PE measured from tensile or compressive tests consists of four characteristic stages, for elastic, yield, strain softening and strain hardening, respectively. 18 With the help of scanning electron microscope (SEM), synchrotron small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction, atomic force microscope (AFM) and other microscopic characterization techniques, mystery of mechanisms for PE deformation have gradually been unveiled. For instance, it is now well known that deformation of PE before yielding mainly involves separation, slippage or shearing, and rotation of the crystal blocks.…”

Section: Introductionmentioning

confidence: 99%

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Molecular dynamics simulation of plastic deformation in polyethylene under uniaxial and biaxial tension

Zhang

Qiao

Fan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Plastic deformation of polyethylene in uniaxial and biaxial loading conditions is studied using molecular dynamics simulation. Effects of tensile strain rates from 1 × 105 to 1 × 109 s−1, and mass density in the range of 0.923–0.926 g/cm3 on mechanical behaviour and microstructure evolution are examined. Two biaxial tensile deformation modes are considered. One is through simultaneous stretching in both the x and y directions and the other sequential stretching, firstly in the x-direction and then in the y-direction while strain in the x-direction remains constant. Tangent modulus and yield stress that are determined using the stress–strain curves from the molecular dynamics simulation show a strong dependence on the deformation mode, strain rate and mass density, and all are in good agreement with results from the experimental testing, including fracture behaviour which is ductile at a low strain rate but brittle at a high strain rate. Furthermore, the study suggests that the stress–strain curves under uniaxial tension and simultaneous biaxial tension at a relatively low strain rate contain four distinguishable regions, for elastic, yield, strain softening and strain hardening, respectively, whereas under sequential biaxial tension, stress increases monotonically with the increase of strain, without noticeable yielding, strain softening or strain hardening behaviour. The molecular dynamics simulation also suggests that an increase in the strain rate enhances the possibility of cavitation. Under simultaneous biaxial tension, with the strain rate increasing from 1 × 106 to 1 × 109 s−1, the molecular dynamics simulation shows that polyethylene failure changes from a local to a global phenomenon, accompanied by a decrease of the void size and increase of uniformity in the void distribution. Under sequential biaxial tension, on the other hand, the density of the cavities is clearly reduced.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation of plastic deformation in polyethylene under uniaxial and biaxial tension

Zhang

Qiao

Fan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

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“…This can lead to errors in measured deformation and elastic modulus. The observed error at high loading, over 35 bar, is due to the absence of failure criterion in the model . The pipe wall is strongly deformed near the defect.…”

Section: Numerical Model Based On Finite Element Methodsmentioning

confidence: 99%

Structural integrity analysis of HDPE pipes for water supplying network

Bouaziz

Guidara

Schmitt

et al. 2018

Fatigue Fract Eng Mat Struct

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A problem of reliability of polymer pipes manufactured with the high‐density polyethylene (HDPE) for drinking water supply was considered. The safety of the pipelines network was analyzed with taking into account two main factors: arising of sudden overpressure (water hammer phenomenon) and presence of defects on pipe surface. Based on elastoplastic fracture mechanics and using of J‐integral approach, the numerical model of cracked pipe was developed and verified by direct experimental test. The formula for calculation of crack initiation pressure, which is the function of pipe size and size of external surface defect, was derived. The validity of this relation was proved for pipes of diameter 450 to 800 mm. It was also shown that the pressure peaks of the water hammer phenomenon are quickly damped because of the high deformability of the polyethylene pipes and the defect depth that is equivalent to 40% of pipe wall thickness can be considered as acceptable. The applicability of developed tools was demonstrated under analysis in the real state of South Tunisian water supply network.

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“…A key factor which directly affects the safety of these attractive performances of the high-density polyethylene (HDPE) pipe is welding technology (Groover, 2007). Investigation shows that one of the failure modes of HDPE pipe is when the crack slowly grows across the butt-fusion welded joint of the HDPE pipe (Czél and Czigány 2014; Luo et al, 2015; Zhang and Ben Jar 2015). The quality of butt-fusion welded joints depends largely on the material properties and the joining procedures, so that the pipe joints usually are not perfect due to some problems including low-order properties, very high melt flow, contamination of the welding surfaces, and so on.…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental study of shape memory alloy reinforcement on the performance of butt-fusion welded joints in high-density polyethylene pipe

Choi

Ostadrahimi

Youn

2020

Journal of Intelligent Material Systems and Structures

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In this article, a shape memory alloy wire is employed as confinement to enhance the flexural rigidity of the butt-fusion welded joints in the high-density polyethylene pipes. To this end, analytical and experimental studies are considered, when the shape memory alloy wire is wrapped around a butt-fusion joint and an internal pressure is applied to the high-density polyethylene pipe. To investigate the efficiency of shape memory alloy wire jacket on the performance of butt-fusion welded joint in high-density polyethylene pipe, two cases of perfect butt-fusion joint and imperfect butt-fusion joint are tested. The influence of the number of shape memory alloy wire jacket on the high-density polyethylene pipe joints as well as the effect of different flexural rigidities of the wire and high-density polyethylene pipe, and different diameters are evaluated. The deformation is measured using linear voltage displacement transducer and digital image correlation analysis at different location of the pipe length. In addition, radial strain of the pipes due to bulging is measured by electronic resistance strain gauges. Results show that the shape memory alloy wire jacket has a significant effect (33%) on enhancing imperfect butt-fusion welded joint of high-density polyethylene pipes.

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Quantitative assessment of deformation-induced damage in polyethylene pressure pipe

Cited by 29 publications

References 44 publications

Molecular dynamics simulation of plastic deformation in polyethylene under uniaxial and biaxial tension

Molecular dynamics simulation of plastic deformation in polyethylene under uniaxial and biaxial tension

Structural integrity analysis of HDPE pipes for water supplying network

Analytical and experimental study of shape memory alloy reinforcement on the performance of butt-fusion welded joints in high-density polyethylene pipe

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