Effect of a post‐annealing process on microstructure and mechanical properties of high‐density polyethylene/silica nanocomposites

2019 ◽  
Vol 57 (9) ◽  
pp. 535-546 ◽  
Author(s):  
Bryan Guichard ◽  
Philippe Cassagnau ◽  
Guillaume Sudre ◽  
René Fulchiron ◽  
Bastien Ledieu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Annealing Process ◽  
High Density ◽  
Silica Nanocomposites ◽  
Post Annealing ◽  
Microstructure And Mechanical Properties

scholarly journals Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Pashupati Pokharel ◽  
Yoonsang Kim ◽  
Sunwoong Choi
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
High Density Polyethylene ◽  
Weld Zone ◽  
Butt Joint ◽  
High Density ◽  
Cooling Time ◽  
Tensile Fracture ◽  
Microstructure And Mechanical Properties ◽  
Dog Bone

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.

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