Optimization of transversal flow stress and strain and weld seam microstructure analysis in butt-HDPE friction stir welded plates

The paper aims to optimize the characteristic performances of friction stir welding of high-density polyethylene in order to predict failure modes in weld nugget and interfacial zones. Three replicates of a face central composite design are employed to estimate the effects of parameters process, on...

Full description

Saved in:
Bibliographic Details
Published in:Mechanics & industry : an international journal on mechanical sciences and engineering applications 2020, Vol.21 (5), p.501
Main Authors: Hamrouni, Khaled, Rezgui, Mohamed-Ali, Trabelsi, Ali, Kiss, Zoltan, Nasri, Rachid
Format: Article
Language:English
Subjects:
Base metal
Butt welding
Cracks
Defects
Failure modes
Feed rate
Flow-density-speed relationships
Friction stir welding
Heat conductivity
High density polyethylenes
Impact strength
Investigations
Mechanical properties
Morphology
Optimization
Parameter estimation
Polyethylene
Polymers
Polymethyl methacrylate
Process parameters
Rotation
Shoulder
Strain
Tensile strength
Yield strength
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The paper aims to optimize the characteristic performances of friction stir welding of high-density polyethylene in order to predict failure modes in weld nugget and interfacial zones. Three replicates of a face central composite design are employed to estimate the effects of parameters process, on the transversal flow stress and strain of the seam and to understand root causes, which may lead to structural defects such as the onset of cracks and the seam-base metal rupture. The study findings disclose that maximum responses are obtained when the tool rotation speed is set middle and both the feed rate and the plunged surface are set high. The transversal flow stress of the welded seam is found highly sensitive to the plunged surfaces and at a lesser degree to the rotation speed, whereas, the transversal flow strain of the welded seam is mostly sensitive to the rotation speed and at a lesser degree to the plunged surfaces. For the microscopic analysis, it is shown that at low rotation speed, there exist four structural layers in the transition zone between the seam and the base material giving rise to the formation of a continuous line of cracks that can initiate structure failure.
ISSN:2257-7777
2257-7750
DOI:10.1051/meca/2020047