Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316

This research was carried out to study the effect of loading parameter on fatigue crack growth behaviour of stainless steel 316 at room temperature using the center-crack tension M(T) specimens. The parameter involved were R-ratio and D s . For studying the effect of R-ratio, experiments were car...

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Main Author:	Mustapa, Mohammad Sukri
Format:	Thesis
Published:	2001
Subjects:	TJ Mechanical engineering and machinery
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id	my-utm-ep.6932
record_format	uketd_dc
spelling	my-utm-ep.69322011-01-23T12:12:56Z Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316 2001 Mustapa, Mohammad Sukri TJ Mechanical engineering and machinery This research was carried out to study the effect of loading parameter on fatigue crack growth behaviour of stainless steel 316 at room temperature using the center-crack tension M(T) specimens. The parameter involved were R-ratio and D s . For studying the effect of R-ratio, experiments were carried out with R-ratio of 0, 0.33 and 0.6 at constant D s of 100 MPa, whereas for studying the effect of D s , experiments were carried out with D s values of 100, 150 and 225 MPa at constant R-ratio of 0.1. The crack length was measured using a travelling microscope. Results showed that at a given value of cyclic stress intensity, D K the crack growth rate increased with increasing R-ratio but decreased with increasing D s . At the first stage, the value of D Kth decreased with increasing the value of R-ratio but increased as the value of D s was increased. At the linear region, the fatigue crack growth could be described with the Paris-Erdogon Power Law. The fatigue crack growth rate for various R-ratio occurred between 1x10-5 to 1x10-3 mm/cycle whereas, the effect of D s was occurred in a range of 1x10-4 to 2x10-3 mm/cycle. An increase in fatigue crack growth rate by factor 3.4 is observed at low D K of 12 MPa when R-ratio increased from zero to 0.6. At high D K values exceeding 25 MPa, it was found that da/dN converged to 3x10-4mm/cycles. The microscopic examination of the fracture surface was done using SEM. The tension fracture surface showed a ductile fracture where many microvoid coalesced and dimples were found. Fractography of the fracture surface showed striation at the second stage especially at high D K. At this stage crack occurred transgranularly with little intergranular crack but at the third stage crack occurred intergranularly 2001 Thesis http://eprints.utm.my/id/eprint/6932/ http://sps.utm.my masters UTM Skudai, Mekanikal Mekanikal
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Mustapa, Mohammad Sukri Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316
description	This research was carried out to study the effect of loading parameter on fatigue crack growth behaviour of stainless steel 316 at room temperature using the center-crack tension M(T) specimens. The parameter involved were R-ratio and D s . For studying the effect of R-ratio, experiments were carried out with R-ratio of 0, 0.33 and 0.6 at constant D s of 100 MPa, whereas for studying the effect of D s , experiments were carried out with D s values of 100, 150 and 225 MPa at constant R-ratio of 0.1. The crack length was measured using a travelling microscope. Results showed that at a given value of cyclic stress intensity, D K the crack growth rate increased with increasing R-ratio but decreased with increasing D s . At the first stage, the value of D Kth decreased with increasing the value of R-ratio but increased as the value of D s was increased. At the linear region, the fatigue crack growth could be described with the Paris-Erdogon Power Law. The fatigue crack growth rate for various R-ratio occurred between 1x10-5 to 1x10-3 mm/cycle whereas, the effect of D s was occurred in a range of 1x10-4 to 2x10-3 mm/cycle. An increase in fatigue crack growth rate by factor 3.4 is observed at low D K of 12 MPa when R-ratio increased from zero to 0.6. At high D K values exceeding 25 MPa, it was found that da/dN converged to 3x10-4mm/cycles. The microscopic examination of the fracture surface was done using SEM. The tension fracture surface showed a ductile fracture where many microvoid coalesced and dimples were found. Fractography of the fracture surface showed striation at the second stage especially at high D K. At this stage crack occurred transgranularly with little intergranular crack but at the third stage crack occurred intergranularly
format	Thesis
qualification_level	Master's degree
author	Mustapa, Mohammad Sukri
author_facet	Mustapa, Mohammad Sukri
author_sort	Mustapa, Mohammad Sukri
title	Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316
title_short	Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316
title_full	Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316
title_fullStr	Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316
title_full_unstemmed	Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316
title_sort	kesan parameter bebanan ke atas kadar perambatan retak-lesu di dalam kelakuan keluli tahan karat 316
granting_institution	UTM Skudai, Mekanikal
granting_department	Mekanikal
publishDate	2001
_version_	1747814702816165888

Kesan Parameter Bebanan Ke Atas Kadar Perambatan Retak-Lesu Di Dalam Kelakuan Keluli Tahan Karat 316

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