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A novel geometry based approach for casting process optimisation. / Minkesh Paul Sood

Swansea University Author: Minkesh Paul Sood

Abstract

The work presented in this thesis constitutes the main body of research carried out to develop a new technique for solidification simulation by using the Medial Axis Transformation (MAT) technique in combination with other geometric reasoning and numerical methods. The aspects of casting solidificat...

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Published: 2006
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42352
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last_indexed 2018-08-03T10:09:55Z
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spelling 2018-08-02T16:24:28.9321901 v2 42352 2018-08-02 A novel geometry based approach for casting process optimisation. f930b9c8b2982cec8eb5f7183d2d3222 NULL Minkesh Paul Sood Minkesh Paul Sood true true 2018-08-02 The work presented in this thesis constitutes the main body of research carried out to develop a new technique for solidification simulation by using the Medial Axis Transformation (MAT) technique in combination with other geometric reasoning and numerical methods. The aspects of casting solidification researched include a review of existing geometric reasoning techniques and employability of MAT in combination with other methods. In the first phase of research, MAT was used to present a one-dimensional interpolation scheme that provided quick results compared to the numerical methods and evolving temperature solutions in time when compared to modulus method. The scheme successfully predicted the location of hotspots and provided an acceptable temperature distribution. Learning from, and owing to limitations posed by the interpolation scheme, a new innovative and hybrid technique was then proposed that for the first time unifies geometric and numerical methods, thereby inheriting their advantages and overcoming their respective limitations. The inscribed radius and other relevant geometric information were extracted from MAT. This was then combined with the Heuvers' Circle method. A new equation, based on Chvorinov's classic rule and modulus method, was derived that enabled the proposed technique to utilise the radius information of the casting to obtain effective interface boundary conditions for an optimal solution. The proposed method was then tested on a range of casting geometries, including those from the foundries. The problems arising from complexity of the medial axes were resolved by developing a sorting technique to select the most effective Heuvers' radii and a scaling framework was also developed to obtain realistic values. Finally the application of this technique to 3D castings was conceptualised and demonstrated through a case study. Thus an effective technique has been developed that not only retains the simplicity, ease of use, speed of the conventional geometric reasoning techniques but also the accuracy and sensitivity to material properties and boundary conditions offered by the numerical methods. The proposed method is capable of providing optimal solutions in two FE simulations. E-Thesis Materials science. 31 12 2006 2006-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:28.9321901 2018-08-02T16:24:28.9321901 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Minkesh Paul Sood NULL 1 0042352-02082018162447.pdf 10798060.pdf 2018-08-02T16:24:47.7000000 Output 17735143 application/pdf E-Thesis true 2018-08-02T16:24:47.7000000 false
title A novel geometry based approach for casting process optimisation.
spellingShingle A novel geometry based approach for casting process optimisation.
Minkesh Paul Sood
title_short A novel geometry based approach for casting process optimisation.
title_full A novel geometry based approach for casting process optimisation.
title_fullStr A novel geometry based approach for casting process optimisation.
title_full_unstemmed A novel geometry based approach for casting process optimisation.
title_sort A novel geometry based approach for casting process optimisation.
author_id_str_mv f930b9c8b2982cec8eb5f7183d2d3222
author_id_fullname_str_mv f930b9c8b2982cec8eb5f7183d2d3222_***_Minkesh Paul Sood
author Minkesh Paul Sood
author2 Minkesh Paul Sood
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 The work presented in this thesis constitutes the main body of research carried out to develop a new technique for solidification simulation by using the Medial Axis Transformation (MAT) technique in combination with other geometric reasoning and numerical methods. The aspects of casting solidification researched include a review of existing geometric reasoning techniques and employability of MAT in combination with other methods. In the first phase of research, MAT was used to present a one-dimensional interpolation scheme that provided quick results compared to the numerical methods and evolving temperature solutions in time when compared to modulus method. The scheme successfully predicted the location of hotspots and provided an acceptable temperature distribution. Learning from, and owing to limitations posed by the interpolation scheme, a new innovative and hybrid technique was then proposed that for the first time unifies geometric and numerical methods, thereby inheriting their advantages and overcoming their respective limitations. The inscribed radius and other relevant geometric information were extracted from MAT. This was then combined with the Heuvers' Circle method. A new equation, based on Chvorinov's classic rule and modulus method, was derived that enabled the proposed technique to utilise the radius information of the casting to obtain effective interface boundary conditions for an optimal solution. The proposed method was then tested on a range of casting geometries, including those from the foundries. The problems arising from complexity of the medial axes were resolved by developing a sorting technique to select the most effective Heuvers' radii and a scaling framework was also developed to obtain realistic values. Finally the application of this technique to 3D castings was conceptualised and demonstrated through a case study. Thus an effective technique has been developed that not only retains the simplicity, ease of use, speed of the conventional geometric reasoning techniques but also the accuracy and sensitivity to material properties and boundary conditions offered by the numerical methods. The proposed method is capable of providing optimal solutions in two FE simulations.
published_date 2006-12-31T03:52:48Z
_version_ 1763752613661114368
score 11.013641

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