Ratchetting of composite pipes

The uniaxial ratchetting characteristics of fibre glass reinforced epoxy laminate have been investigated in the present project. The specimens were subjected to cyclic axial stress with a constant mean stress of 40 MPa and a varying amplitude stress of 26.67 MPa and 53.33 MPa. Tests were also perfor...

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Main Author:	Basaruddin, Khairul Salleh
Format:	Thesis
Language:	English
Published:	2007
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/9564/1/KhairulSallehBasaruddinMFKM2007.pdf
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id	my-utm-ep.9564
record_format	uketd_dc
spelling	my-utm-ep.95642018-09-27T05:20:59Z Ratchetting of composite pipes 2007-10 Basaruddin, Khairul Salleh TJ Mechanical engineering and machinery The uniaxial ratchetting characteristics of fibre glass reinforced epoxy laminate have been investigated in the present project. The specimens were subjected to cyclic axial stress with a constant mean stress of 40 MPa and a varying amplitude stress of 26.67 MPa and 53.33 MPa. Tests were also performed on 50 mm diameter, Glass fibre Reinforced Epoxy (GRE) straight pipe. The pipe was subjected to a constant internal pressure of 1.875 MPa and a cyclic axial load. The finite element model in ABAQUS has also been simulated in similar loading case. The comparisons between experiment and simulation results were observed. The effect of fibre orientation on the rate of ratchetting was also investigated at the present project. The uniaxial and biaxial ratchetting strain was observed to increase with a number of cycles but decreased the rate of ratchetting. The specimen showed no further ratchetting rate and exhibited shakedown after some strain accumulation. On the basis of experiment and simulation, it appears that ratchetting would occur in the circumferential direction for a composite pipe subjected to constant internal pressure and cyclic displacement with no ratchetting observed in axial direction. A direction in fibre orientation seemed to have effect on the rate of ratchetting. Thus, the increasing of fibre angle from the axial load axis will increase the rate of ratchetting. 2007-10 Thesis http://eprints.utm.my/id/eprint/9564/ http://eprints.utm.my/id/eprint/9564/1/KhairulSallehBasaruddinMFKM2007.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:852dms.library.utm.my:8080/vital/access/manager/Repository/vital:852?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Basaruddin, Khairul Salleh Ratchetting of composite pipes
description	The uniaxial ratchetting characteristics of fibre glass reinforced epoxy laminate have been investigated in the present project. The specimens were subjected to cyclic axial stress with a constant mean stress of 40 MPa and a varying amplitude stress of 26.67 MPa and 53.33 MPa. Tests were also performed on 50 mm diameter, Glass fibre Reinforced Epoxy (GRE) straight pipe. The pipe was subjected to a constant internal pressure of 1.875 MPa and a cyclic axial load. The finite element model in ABAQUS has also been simulated in similar loading case. The comparisons between experiment and simulation results were observed. The effect of fibre orientation on the rate of ratchetting was also investigated at the present project. The uniaxial and biaxial ratchetting strain was observed to increase with a number of cycles but decreased the rate of ratchetting. The specimen showed no further ratchetting rate and exhibited shakedown after some strain accumulation. On the basis of experiment and simulation, it appears that ratchetting would occur in the circumferential direction for a composite pipe subjected to constant internal pressure and cyclic displacement with no ratchetting observed in axial direction. A direction in fibre orientation seemed to have effect on the rate of ratchetting. Thus, the increasing of fibre angle from the axial load axis will increase the rate of ratchetting.
format	Thesis
qualification_level	Master's degree
author	Basaruddin, Khairul Salleh
author_facet	Basaruddin, Khairul Salleh
author_sort	Basaruddin, Khairul Salleh
title	Ratchetting of composite pipes
title_short	Ratchetting of composite pipes
title_full	Ratchetting of composite pipes
title_fullStr	Ratchetting of composite pipes
title_full_unstemmed	Ratchetting of composite pipes
title_sort	ratchetting of composite pipes
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2007
url	http://eprints.utm.my/id/eprint/9564/1/KhairulSallehBasaruddinMFKM2007.pdf
_version_	1747814756061806592

Ratchetting of composite pipes

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