$Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor$

Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor

Polyethylene, a thermoplastic, was developed industrially in England fifty years ago. Polyethylene is widely use in making grocery bags, shampoo bottles, children's toys, and even bullet proof vests. A molecule of polyethylene is a long chain of carbon atoms, with two hydrogen atoms attached to...

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Main Author:	Mohd Nor, Safwan
Format:	Thesis
Language:	English
Published:	2002
Subjects:	Analytic mechanics Plastics
Online Access:	https://ir.uitm.edu.my/id/eprint/68798/1/68798.pdf
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spelling	my-uitm-ir.687982022-10-21T07:18:12Z Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor 2002 Mohd Nor, Safwan Analytic mechanics Plastics Polyethylene, a thermoplastic, was developed industrially in England fifty years ago. Polyethylene is widely use in making grocery bags, shampoo bottles, children's toys, and even bullet proof vests. A molecule of polyethylene is a long chain of carbon atoms, with two hydrogen atoms attached to each carbon atom. Sometimes some of the carbons, instead of having hydrogens attached to them, will have long chains of polyethylene attached to them. This is called branched, or low-density polyethylene, or LDPE. When there is no branching, it is called linear polyethylene, or HDPE. Linear polyethylene is much stronger than branched polyethylene, but branched polyethylene is cheaper and easier to make. The objective of the study is to analyse changes of fracture behaviour of HDPE at different loading rate. Defect assessment against fracture-initiated failure is carried out using fracture characterising parameters determined under tensile, quasi-static and intermediate rates of loading. For these situations the rate sensitivity of the material to fracture is considered. Fracture toughness tests (COD) have been conducted on HDPE over a range of loading rates. The effect of increased loading rate is to reduce the crack-opening displacement whilst changing the fracture behaviour, such transition from ductile to brittle. We learn that HDPE behaves in ductile manner in the quasi- static test, but it also behave in a brittle fashion by increasing the rate of speed of the test. These fracture touglmess tests are designed to characterise the touglmess of plastics in terms of the critical stress intensity factor, KK at fracture initiation. 2002 Thesis https://ir.uitm.edu.my/id/eprint/68798/ https://ir.uitm.edu.my/id/eprint/68798/1/68798.pdf text en public degree Universiti Teknologi MARA (UiTM) Faculty of Mechanical Engineering Md. Taib, Yakub
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Md. Taib, Yakub
topic	Analytic mechanics Plastics
spellingShingle	Analytic mechanics Plastics Mohd Nor, Safwan Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor
description	Polyethylene, a thermoplastic, was developed industrially in England fifty years ago. Polyethylene is widely use in making grocery bags, shampoo bottles, children's toys, and even bullet proof vests. A molecule of polyethylene is a long chain of carbon atoms, with two hydrogen atoms attached to each carbon atom. Sometimes some of the carbons, instead of having hydrogens attached to them, will have long chains of polyethylene attached to them. This is called branched, or low-density polyethylene, or LDPE. When there is no branching, it is called linear polyethylene, or HDPE. Linear polyethylene is much stronger than branched polyethylene, but branched polyethylene is cheaper and easier to make. The objective of the study is to analyse changes of fracture behaviour of HDPE at different loading rate. Defect assessment against fracture-initiated failure is carried out using fracture characterising parameters determined under tensile, quasi-static and intermediate rates of loading. For these situations the rate sensitivity of the material to fracture is considered. Fracture toughness tests (COD) have been conducted on HDPE over a range of loading rates. The effect of increased loading rate is to reduce the crack-opening displacement whilst changing the fracture behaviour, such transition from ductile to brittle. We learn that HDPE behaves in ductile manner in the quasi- static test, but it also behave in a brittle fashion by increasing the rate of speed of the test. These fracture touglmess tests are designed to characterise the touglmess of plastics in terms of the critical stress intensity factor, KK at fracture initiation.
format	Thesis
qualification_level	Bachelor degree
author	Mohd Nor, Safwan
author_facet	Mohd Nor, Safwan
author_sort	Mohd Nor, Safwan
title	Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor
title_short	Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor
title_full	Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor
title_fullStr	Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor
title_full_unstemmed	Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor
title_sort	effect of loading rates on the fracture toughness of hdpe plastics / safwan mohd nor
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Mechanical Engineering
publishDate	2002
url	https://ir.uitm.edu.my/id/eprint/68798/1/68798.pdf
_version_	1783735812208197632

Effect of loading rates on the fracture toughness of HDPE plastics / Safwan Mohd Nor

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