On crack propagation in the welded polyolefin pipes with and without the presence of weld beads

Mikula, J. Bradley; Hutař, Pavel; Nezbedová, E.; Lach, Ralf; Arbeiter, Florian; Ševčík, Martin; Pinter, Gerald; Grellmann, W.; Náhlík, Luboš

doi:10.1016/j.matdes.2015.07.131

Cited by 13 publications

(4 citation statements)

References 21 publications

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Section: Microstructure Analysismentioning

confidence: 93%

“…Consequently, the distinct microstructure at different locations of the welded joint resulted in variations in the mechanical properties across these regions, such as hardness and elastic modulus. Previous studies have reported that the MZ exhibits superior hardness levels along with higher degrees of crystallinity and Young's modulus [29]. Since none of the specimens failed at the butt fusion welded joint, as shown in Figure 2, SEM was used to investigate the failed specimen on the out surface of the welded joint at different locations, which were the same as shown in Figure 3a.…”

Section: Microstructure Analysismentioning

confidence: 99%

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Investigation of Creep Behavior of HDPE Pipe Butt Fusion Welded Joints Using a Stepped Isostress Method

Bai,

Lin,

Lai

2024

Polymers

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The utilization of high-density polyethylene (HDPE) pipes is prevalent in water transportation due to their exceptional durability, resistance to corrosion, and ease of installation. Traditionally, butt fusion welding has been employed to connect HDPE pipes. In this study, scanning electron microscopy (SEM) was utilized to examine the microstructure of butt fusion welded joints of HDPE pipes, while the stepped isostress method (SSM) was employed to investigate their creep behavior at 100 °C in ambient air. SEM results revealed a significant presence of craze or lamellae in the base material, whereas minimal occurrences of craze or lamellae were observed in the melt zone. The results obtained from the SSM indicated that the creep life of butt fusion welded joints of HDPE pipes was not adversely affected by the welding bead, and their creep life was no less than that of the base material when ductile creep failure occurred.

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Section: Microstructure Analysismentioning

confidence: 93%

Section: Microstructure Analysismentioning

confidence: 99%

Investigation of Creep Behavior of HDPE Pipe Butt Fusion Welded Joints Using a Stepped Isostress Method

Bai,

Lin,

Lai

2024

Polymers

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“…Scientific researches have sought to highlight the influence of certain imperfections in the welded joints of polyethylene structures on their mechanical behaviour [2,3]. As well, by simulating a series of spherical and plane imperfections of different sizes in butt fusion welded joints, it was intended to evaluate their influence on the quality of the welded joint by tensile tests and with finite elements method [4].…”

Section: Introductionmentioning

confidence: 99%

Influence Analysis of the Controllable Factors on the Objective Functions for Optimizing the Welding of PE 100 Pipelines for Natural Gas Distribution

Cocard

2021

AMR

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The paper presents a series of experimental researches performed using the design of experiments method RSD (Response Surface Design) for modeling and optimizing the welding process of PE 100 pipelines, used in natural gas distribution. In this sense, the aim was to analyze the influence of controllable factors such as pressure, temperature and time on the objective functions, aiming to obtain certain characteristics of the welded joint. By modeling the welding process, based on the results obtained, an optimal welding procedure was established and validated to meet the conditions imposed on the objective functions.

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“…As urbanization accelerates, there is a huge demand for clean and easy transportation of industrial and civil production materials, where polymeric pipes featuring low cost, easy installation, and light weight, have always been the optimum option . Comparing with other polymeric pipes, polypropylene (PP) pipes exhibit obvious advantages in hot drinking water supply and underground drainage system due to its outstanding dimensional stability, and are considered as the ideal candidates for future construction materials .…”

Section: Introductionmentioning

confidence: 99%

Crystalline composition and morphology in isotactic polypropylene pipe under combining effects of rotation extrusion and fibril β‐nucleating Agent

Nie

Wang

2018

Vinyl Additive Technology

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Polypropylene (PP) pipe is extraordinarily important in modern construction and transportation engineering owing its predominant advantages over metal such as good dimensional stability, low cost, and light weight. However, low toughness and hoop strength always stand in the way of the wide application. In this study, two kinds of β-nucleating agents (NAs) (WBG-II and NAB-83) were added in isotactic polypropylene and thereafter, the crystalline composition, morphology, and alignment were investigated under the combination effects of rotation extrusion and NA. The experimental results showed that both NAB-83 and WBG-II could promote numerous β crystals, but dot-like NAB-83 could only induce randomly distributed isotropic spherulites. On the contrary, by adjusting the temperature gradient along the extrusion to rotation section, WBG-II first dissolved into PP melts and then self-assembled into fiberlike nuclei before the formation of PP crystals. Compared to homogeneous crystallization, fibrous WBG-II nuclei lowered the energy barrier for PP crystals; therefore, epitaxial β lamellae grew on these fibrous NAs and stacked into β-form hybrid shish kebabs. Meanwhile, the alignment of these highly oriented structures deflected from the axis driven by the helical movement caused by die rotation. Consequently, PP pipe with outstanding hoop tensile performance as well as excellent toughness was prepared. J. VINYL ADDIT. TECHNOL., 25: E195-E202, 2019.

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On crack propagation in the welded polyolefin pipes with and without the presence of weld beads

Cited by 13 publications

References 21 publications

Investigation of Creep Behavior of HDPE Pipe Butt Fusion Welded Joints Using a Stepped Isostress Method

Investigation of Creep Behavior of HDPE Pipe Butt Fusion Welded Joints Using a Stepped Isostress Method

Influence Analysis of the Controllable Factors on the Objective Functions for Optimizing the Welding of PE 100 Pipelines for Natural Gas Distribution

Crystalline composition and morphology in isotactic polypropylene pipe under combining effects of rotation extrusion and fibril β‐nucleating Agent

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