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Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes. / Kuanjin Han

Swansea University Author: Kuanjin Han

Abstract

Several major algorithmic and modelling aspects of the discrete element method are presented, with particular effort made to establish a general framework for the combined finite/discrete element simulation of shot peening and peen forming processes. On the basis of a general review of the contact d...

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Published: 2004
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42687
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last_indexed 2018-08-03T10:10:50Z
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spelling 2018-08-02T16:24:30.1178000 v2 42687 2018-08-02 Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes. 4c447e86c076e86b55bef0729546989c NULL Kuanjin Han Kuanjin Han true true 2018-08-02 Several major algorithmic and modelling aspects of the discrete element method are presented, with particular effort made to establish a general framework for the combined finite/discrete element simulation of shot peening and peen forming processes. On the basis of a general review of the contact detection algorithms, the alternating digital tree (ADT) and the augmented spatial digital tree (ASDT) are presented as examples of tree based search algorithms; whilst the dynamic cell based search algorithm is presented as an example of cell/grid based search algorithms. Extensive numerical tests are provided to compare the performance of the approaches discussed and to perform a parametric study of the dynamic cell algorithm. Contact resolution for circular and spherical discrete objects is comprehensively discussed. Following the establishment of geometric relations between contact pairs, four interaction laws for the normal contact are reviewed, together with a general analysis of the equivalence between them. A modified classic Coulomb friction model is proposed for 3D contact problems, and a new time stepping scheme is developed to ensure both short and long term stability of the contact models. In addition, two different schemes that incorporate energy dissipation into the contact model are reviewed. A new approach is proposed for contact resolution of 2D superquadrics. An advancing front technique based algorithm is described to generate a random packing of disks, ellipses and polygons; whereas a geometric based compression algorithm is developed to generate a random packing of spheres of various sizes within a geometric domain. A general algorithmic framework is established for the combined finite/discrete element analysis of shot peening processes, particularly for the evaluation and comparison of several interaction laws governing the contact between shot and workpiece. The proposed model is also verified with the experiments conducted elsewhere. A two stage combined finite/discrete element and explicit/implicit solution procedure for the simulation of peen forming process is developed, and verified with experiments. E-Thesis Computer science.;Materials science. 31 12 2004 2004-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:30.1178000 2018-08-02T16:24:30.1178000 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Kuanjin Han NULL 1 0042687-02082018162514.pdf 10807456.pdf 2018-08-02T16:25:14.0800000 Output 12547922 application/pdf E-Thesis true 2018-08-02T16:25:14.0800000 false
title Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
spellingShingle Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
Kuanjin Han
title_short Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
title_full Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
title_fullStr Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
title_full_unstemmed Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
title_sort Algorithmic and modelling aspects of discrete element method with applications to shot preening and peen forming processes.
author_id_str_mv 4c447e86c076e86b55bef0729546989c
author_id_fullname_str_mv 4c447e86c076e86b55bef0729546989c_***_Kuanjin Han
author Kuanjin Han
author2 Kuanjin Han
format E-Thesis
publishDate 2004
institution Swansea University
college_str Faculty of Science and Engineering
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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 Several major algorithmic and modelling aspects of the discrete element method are presented, with particular effort made to establish a general framework for the combined finite/discrete element simulation of shot peening and peen forming processes. On the basis of a general review of the contact detection algorithms, the alternating digital tree (ADT) and the augmented spatial digital tree (ASDT) are presented as examples of tree based search algorithms; whilst the dynamic cell based search algorithm is presented as an example of cell/grid based search algorithms. Extensive numerical tests are provided to compare the performance of the approaches discussed and to perform a parametric study of the dynamic cell algorithm. Contact resolution for circular and spherical discrete objects is comprehensively discussed. Following the establishment of geometric relations between contact pairs, four interaction laws for the normal contact are reviewed, together with a general analysis of the equivalence between them. A modified classic Coulomb friction model is proposed for 3D contact problems, and a new time stepping scheme is developed to ensure both short and long term stability of the contact models. In addition, two different schemes that incorporate energy dissipation into the contact model are reviewed. A new approach is proposed for contact resolution of 2D superquadrics. An advancing front technique based algorithm is described to generate a random packing of disks, ellipses and polygons; whereas a geometric based compression algorithm is developed to generate a random packing of spheres of various sizes within a geometric domain. A general algorithmic framework is established for the combined finite/discrete element analysis of shot peening processes, particularly for the evaluation and comparison of several interaction laws governing the contact between shot and workpiece. The proposed model is also verified with the experiments conducted elsewhere. A two stage combined finite/discrete element and explicit/implicit solution procedure for the simulation of peen forming process is developed, and verified with experiments.
published_date 2004-12-31T03:53:27Z
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score 11.014067

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