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Optimisation of the squeeze forming process. / Rosli Ahmad

Swansea University Author: Rosli Ahmad

Abstract

This thesis presents the optimisation of the squeeze forming process, considering both the thermal and mechanical aspects. The Finite Element Method has been used to simulate the process and a Genetic Algorithm was used as an optimisation tool. The thermal optimisation has been applied to the squeez...

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Published: 2006
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42636
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last_indexed 2018-08-03T10:10:40Z
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spelling 2018-08-02T16:24:29.9306015 v2 42636 2018-08-02 Optimisation of the squeeze forming process. 0589b7822510105be57cc74b879e51d1 NULL Rosli Ahmad Rosli Ahmad true true 2018-08-02 This thesis presents the optimisation of the squeeze forming process, considering both the thermal and mechanical aspects. The Finite Element Method has been used to simulate the process and a Genetic Algorithm was used as an optimisation tool. The thermal optimisation has been applied to the squeeze forming process to achieve near simultaneous solidification in the cast part. The positions of the coolant channels were considered as design variables in order to achieve such an objective. The formulation of the objective functions involved two points and also considered the whole domain. The validation aspects of the optimisation of the casting processes for 2D and axi-symmetric problems were presented. The influence of the interfacial heat transfer coefficient related to optimisation of the process was explored. For the multi-objective optimisation problem, the objective was to achieve near simultaneous solidification in the cast part and also near uniform von Mises stress distribution in the die for the first and also tenth cycles. This is because it has been found that the process starts to reach cyclic stabilisation after the tenth cycle. The comparison between the design obtained from the practical solution derived from the optimisation process and also the design which has been applied in industry was also discussed. The Design Sensitivity Analysis and Design Element Concept have been applied to the squeeze forming process. For parameter sensitivity analysis, the Youngs Modulus was considered as a design variable. A few design element subdivisions have been employed to explore its application to the process. For shape sensitivities involving the coolant channels, the parameterisation was required in order to consider the coolant channel as an entity. The extent to which the tendency to move the coolant channel either in the X or Y-direction with respect to the particular von Mises stress constraint in the die was also discussed. E-Thesis Mechanical engineering.;Thermodynamics. 31 12 2006 2006-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.9306015 2018-08-02T16:24:29.9306015 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Rosli Ahmad NULL 1 0042636-02082018162510.pdf 10805412.pdf 2018-08-02T16:25:10.0700000 Output 17323389 application/pdf E-Thesis true 2018-08-02T16:25:10.0700000 false
title Optimisation of the squeeze forming process.
spellingShingle Optimisation of the squeeze forming process.
Rosli Ahmad
title_short Optimisation of the squeeze forming process.
title_full Optimisation of the squeeze forming process.
title_fullStr Optimisation of the squeeze forming process.
title_full_unstemmed Optimisation of the squeeze forming process.
title_sort Optimisation of the squeeze forming process.
author_id_str_mv 0589b7822510105be57cc74b879e51d1
author_id_fullname_str_mv 0589b7822510105be57cc74b879e51d1_***_Rosli Ahmad
author Rosli Ahmad
author2 Rosli Ahmad
format E-Thesis
publishDate 2006
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This thesis presents the optimisation of the squeeze forming process, considering both the thermal and mechanical aspects. The Finite Element Method has been used to simulate the process and a Genetic Algorithm was used as an optimisation tool. The thermal optimisation has been applied to the squeeze forming process to achieve near simultaneous solidification in the cast part. The positions of the coolant channels were considered as design variables in order to achieve such an objective. The formulation of the objective functions involved two points and also considered the whole domain. The validation aspects of the optimisation of the casting processes for 2D and axi-symmetric problems were presented. The influence of the interfacial heat transfer coefficient related to optimisation of the process was explored. For the multi-objective optimisation problem, the objective was to achieve near simultaneous solidification in the cast part and also near uniform von Mises stress distribution in the die for the first and also tenth cycles. This is because it has been found that the process starts to reach cyclic stabilisation after the tenth cycle. The comparison between the design obtained from the practical solution derived from the optimisation process and also the design which has been applied in industry was also discussed. The Design Sensitivity Analysis and Design Element Concept have been applied to the squeeze forming process. For parameter sensitivity analysis, the Youngs Modulus was considered as a design variable. A few design element subdivisions have been employed to explore its application to the process. For shape sensitivities involving the coolant channels, the parameterisation was required in order to consider the coolant channel as an entity. The extent to which the tendency to move the coolant channel either in the X or Y-direction with respect to the particular von Mises stress constraint in the die was also discussed.
published_date 2006-12-31T03:52:54Z
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score 10.926911