Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe
The microstructure and mechanical properties of the butt joint in high density polyethylene (HDPE) pipes were evaluated by preparing the joints with increasing the cooling time from 10 s to 70 s before pressure created for fusion of the pipes. Here, cold fusion flaws in HDPE butt joint were created...
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2016/6483295 |
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| author | Pashupati Pokharel Yoonsang Kim Sunwoong Choi |
| author_facet | Pashupati Pokharel Yoonsang Kim Sunwoong Choi |
| author_sort | Pashupati Pokharel |
| collection | DOAJ |
| description | The microstructure and mechanical properties of the butt joint in high density polyethylene (HDPE) pipes were evaluated by preparing the joints with increasing the cooling time from 10 s to 70 s before pressure created for fusion of the pipes. Here, cold fusion flaws in HDPE butt joint were created with increasing the cooling time around 70 s caused by the close molecular contact followed by insufficient interdiffusion of chain segments back and forth across the wetted interface. The tensile failure mechanism of the welded pipes at different fusion time was projected based on the tensile test of dog-bone shaped, fully notched bar type as well as round U-notched specimens. The mechanical properties of the joints at different fusion time were correlated with the corresponding fracture surface morphology. The weld seam as well as tensile fracture surfaces were etched using strong oxidizing agents. The crystallinity of surface etched weld zone by potassium permanganate based etchant was found higher than unetched sample due to the higher susceptibility of amorphous phase of polyethylene with oxidizing agent. The U-notched tensile test of butt welded HDPE pipe and surface etching of the weldments provided clear delineation about the joint quality. |
| format | Article |
| id | doaj-art-975f2aeb517e4624a5dbf9f94c072f0d |
| institution | Kabale University |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-975f2aeb517e4624a5dbf9f94c072f0d2025-02-03T01:03:12ZengWileyInternational Journal of Polymer Science1687-94221687-94302016-01-01201610.1155/2016/64832956483295Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene PipePashupati Pokharel0Yoonsang Kim1Sunwoong Choi2Department of Polymer Science and Engineering, Hannam University, Daejeon 305-811, Republic of KoreaDepartment of Polymer Science and Engineering, Hannam University, Daejeon 305-811, Republic of KoreaDepartment of Polymer Science and Engineering, Hannam University, Daejeon 305-811, Republic of KoreaThe microstructure and mechanical properties of the butt joint in high density polyethylene (HDPE) pipes were evaluated by preparing the joints with increasing the cooling time from 10 s to 70 s before pressure created for fusion of the pipes. Here, cold fusion flaws in HDPE butt joint were created with increasing the cooling time around 70 s caused by the close molecular contact followed by insufficient interdiffusion of chain segments back and forth across the wetted interface. The tensile failure mechanism of the welded pipes at different fusion time was projected based on the tensile test of dog-bone shaped, fully notched bar type as well as round U-notched specimens. The mechanical properties of the joints at different fusion time were correlated with the corresponding fracture surface morphology. The weld seam as well as tensile fracture surfaces were etched using strong oxidizing agents. The crystallinity of surface etched weld zone by potassium permanganate based etchant was found higher than unetched sample due to the higher susceptibility of amorphous phase of polyethylene with oxidizing agent. The U-notched tensile test of butt welded HDPE pipe and surface etching of the weldments provided clear delineation about the joint quality.http://dx.doi.org/10.1155/2016/6483295 |
| spellingShingle | Pashupati Pokharel Yoonsang Kim Sunwoong Choi Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe International Journal of Polymer Science |
| title | Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe |
| title_full | Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe |
| title_fullStr | Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe |
| title_full_unstemmed | Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe |
| title_short | Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe |
| title_sort | microstructure and mechanical properties of the butt joint in high density polyethylene pipe |
| url | http://dx.doi.org/10.1155/2016/6483295 |
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