Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion
碩士 === 國立交通大學 === 機械工程系 === 89 === The composite clad rod is a rod composed of two or more materials. It is applied extensively in industry because of its outstanding mechanical characteristics. However, when subject to extrusion the composite clad rod tend to develop non-uniform deformat...
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ndltd-TW-089NCTU04891062016-01-29T04:28:15Z http://ndltd.ncl.edu.tw/handle/99886267284818540944 Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion 以偏差速度場探討複合包芯材於擠製時之芯材破斷條件 Yu-Kai Lin 林裕凱 碩士 國立交通大學 機械工程系 89 The composite clad rod is a rod composed of two or more materials. It is applied extensively in industry because of its outstanding mechanical characteristics. However, when subject to extrusion the composite clad rod tend to develop non-uniform deformation because of these differences in materials’ mechanical properties. In certain cases, core fracture appears. The main object of this thesis is to investigate the criterion of core fracture for composite clad rod in extrusion. Upper-bound method was adopted for the analysis with a kinematically admissible velocity field to simulate the core and the sleeve’s uniform deformation under sound process parameter combinations, while a deviation-velocity field simulates the radial flow of core material. These two velocity fields are combined together with a designed variable applied to the deviation velocity component. When the total minimized power of extrusion indicates an existence of deviation velocity component, the initiation of the core fracture is deemed positive to occur. With this criterion for core fracture established, the extrusion work designed variable combinations is systematically investigated, and the work limit diagram for the composite clad rod in extrusion can be constructed. 徐瑞坤 2001 學位論文 ; thesis 61 zh-TW |
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碩士 === 國立交通大學 === 機械工程系 === 89 === The composite clad rod is a rod composed of two or more materials. It is applied extensively in industry because of its outstanding mechanical characteristics. However, when subject to extrusion the composite clad rod tend to develop non-uniform deformation because of these differences in materials’ mechanical properties. In certain cases, core fracture appears.
The main object of this thesis is to investigate the criterion of core fracture for composite clad rod in extrusion. Upper-bound method was adopted for the analysis with a kinematically admissible velocity field to simulate the core and the sleeve’s uniform deformation under sound process parameter combinations, while a deviation-velocity field simulates the radial flow of core material. These two velocity fields are combined together with a designed variable applied to the deviation velocity component. When the total minimized power of extrusion indicates an existence of deviation velocity component, the initiation of the core fracture is deemed positive to occur. With this criterion for core fracture established, the extrusion work designed variable combinations is systematically investigated, and the work limit diagram for the composite clad rod in extrusion can be constructed.
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author2 |
徐瑞坤 |
author_facet |
徐瑞坤 Yu-Kai Lin 林裕凱 |
author |
Yu-Kai Lin 林裕凱 |
spellingShingle |
Yu-Kai Lin 林裕凱 Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion |
author_sort |
Yu-Kai Lin |
title |
Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion |
title_short |
Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion |
title_full |
Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion |
title_fullStr |
Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion |
title_full_unstemmed |
Criterion of Core Fracture by Deviation-Velocity for Composite Clad Rod in Extrusion |
title_sort |
criterion of core fracture by deviation-velocity for composite clad rod in extrusion |
publishDate |
2001 |
url |
http://ndltd.ncl.edu.tw/handle/99886267284818540944 |
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