Study on Laser Surface Enhancement of Marine Propellers
Due to the effects of global warming reducing the extent of the sea ice, more and more merchant ships enter ice-infested waters. Ice damages on ships are frequently reported. Propeller is among the most vulnerable parts of a ship subject to ice damages. Propeller damages lead to efficiency loss, det...
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ftchalmersuniojs:oai:odr.chalmers.se:20.500.12380/300374 2023-07-30T04:06:48+02:00 Study on Laser Surface Enhancement of Marine Propellers Patil Bellary, Pradeep Patel, Shubham Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper Li, Zhiyuan 2019-09-30T11:46:53Z application/pdf https://hdl.handle.net/20.500.12380/300374 eng eng MMSX30 https://hdl.handle.net/20.500.12380/300374 finite element analysis ice-propeller interaction laser cladding residual stresses surface grinding H 2019 ftchalmersuniojs https://doi.org/20.500.12380/300374 2023-07-08T19:54:11Z Due to the effects of global warming reducing the extent of the sea ice, more and more merchant ships enter ice-infested waters. Ice damages on ships are frequently reported. Propeller is among the most vulnerable parts of a ship subject to ice damages. Propeller damages lead to efficiency loss, deterioration of cavitation and noise, and even malfunction of the propulsion system. Reparation of damaged propellers are costly. In this study, we aimed at enhancing a propeller’s ice strength while keeping its open-water profile. This was achieved by implementing cladding material on the bronze propeller blades through laser treatment. In this thesis work, numerical analyses of laser cladding process was carried out using finite element (FE) method to investigate if the laser cladding improves the resistance of the marine propeller materials against repeated ice impact loads. A Co-Cr alloy was cladded on two different substrate materials. The laser cladded surfaces were grounded where the effect of a grinding wheel was derived using a combination of rectangular distribution of heat source and grinding forces instead of the presence of actual grinding wheel. Repeated ice impact loads were applied on both the non-cladded substrate and the cladded substrates after grinding for a certain period of time. The efficiency of the cladding and grinding processes was estimated using the impact load simulations. It was observed that after the application of every impact load on the non-cladded substrate, the longitudinal residual stresses and the equivalent plastic strain were increased. But, after grinding the cladded substrate, there was an improvement in the equivalent plastic strain. The inference obtained after multiple simulations were that the grinding process improves the equivalent plastic strain on the cladded substrate. It thus concludes that the laser cladding and grinding processes improve the performance of the propellers against repeated ice impact loads considerably. Other/Unknown Material Sea ice Chalmers University of Technology: Chalmers Open Digital Repository (ODR) |
institution |
Open Polar |
collection |
Chalmers University of Technology: Chalmers Open Digital Repository (ODR) |
op_collection_id |
ftchalmersuniojs |
language |
English |
topic |
finite element analysis ice-propeller interaction laser cladding residual stresses surface grinding |
spellingShingle |
finite element analysis ice-propeller interaction laser cladding residual stresses surface grinding Patil Bellary, Pradeep Patel, Shubham Study on Laser Surface Enhancement of Marine Propellers |
topic_facet |
finite element analysis ice-propeller interaction laser cladding residual stresses surface grinding |
description |
Due to the effects of global warming reducing the extent of the sea ice, more and more merchant ships enter ice-infested waters. Ice damages on ships are frequently reported. Propeller is among the most vulnerable parts of a ship subject to ice damages. Propeller damages lead to efficiency loss, deterioration of cavitation and noise, and even malfunction of the propulsion system. Reparation of damaged propellers are costly. In this study, we aimed at enhancing a propeller’s ice strength while keeping its open-water profile. This was achieved by implementing cladding material on the bronze propeller blades through laser treatment. In this thesis work, numerical analyses of laser cladding process was carried out using finite element (FE) method to investigate if the laser cladding improves the resistance of the marine propeller materials against repeated ice impact loads. A Co-Cr alloy was cladded on two different substrate materials. The laser cladded surfaces were grounded where the effect of a grinding wheel was derived using a combination of rectangular distribution of heat source and grinding forces instead of the presence of actual grinding wheel. Repeated ice impact loads were applied on both the non-cladded substrate and the cladded substrates after grinding for a certain period of time. The efficiency of the cladding and grinding processes was estimated using the impact load simulations. It was observed that after the application of every impact load on the non-cladded substrate, the longitudinal residual stresses and the equivalent plastic strain were increased. But, after grinding the cladded substrate, there was an improvement in the equivalent plastic strain. The inference obtained after multiple simulations were that the grinding process improves the equivalent plastic strain on the cladded substrate. It thus concludes that the laser cladding and grinding processes improve the performance of the propellers against repeated ice impact loads considerably. |
author2 |
Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper Li, Zhiyuan |
format |
Other/Unknown Material |
author |
Patil Bellary, Pradeep Patel, Shubham |
author_facet |
Patil Bellary, Pradeep Patel, Shubham |
author_sort |
Patil Bellary, Pradeep |
title |
Study on Laser Surface Enhancement of Marine Propellers |
title_short |
Study on Laser Surface Enhancement of Marine Propellers |
title_full |
Study on Laser Surface Enhancement of Marine Propellers |
title_fullStr |
Study on Laser Surface Enhancement of Marine Propellers |
title_full_unstemmed |
Study on Laser Surface Enhancement of Marine Propellers |
title_sort |
study on laser surface enhancement of marine propellers |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.12380/300374 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
MMSX30 https://hdl.handle.net/20.500.12380/300374 |
op_doi |
https://doi.org/20.500.12380/300374 |
_version_ |
1772819704158617600 |