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Process modeling of fine-blanking us...

Chen, Zhang-Hua.

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Process modeling of fine-blanking using thermo-mechanical coupling method.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Process modeling of fine-blanking using thermo-mechanical coupling method./
作者:	Chen, Zhang-Hua.
面頁冊數:	248 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-10, Section: B, page: 4849.
Contained By:	Dissertation Abstracts International63-10B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3066673
ISBN:	0493860487

Process modeling of fine-blanking using thermo-mechanical coupling method.
Chen, Zhang-Hua.

Process modeling of fine-blanking using thermo-mechanical coupling method. - 248 p.

Source: Dissertation Abstracts International, Volume: 63-10, Section: B, page: 4849.

Thesis (Ph.D.)--Hong Kong Polytechnic (People's Republic of China), 2002.

The primary objectives of the research project are to investigate into the failure mechanism of fine-blanking process and to develop a methodology that can be used to predict failure in fine-blanking. The scope of this research work is to study the forming mechanism and failure characteristics occurring during fine-blanking based on theoretical modelling, numerical simulation, and experimental investigation.

ISBN: 0493860487Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Process modeling of fine-blanking using thermo-mechanical coupling method.
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245 1 0 $a Process modeling of fine-blanking using thermo-mechanical coupling method.
300 $a 248 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-10, Section: B, page: 4849.
500 $a Supervisors: Tai-Chiu Lee; Chak-Yin Tang.
502 $a Thesis (Ph.D.)--Hong Kong Polytechnic (People's Republic of China), 2002.
520 $a The primary objectives of the research project are to investigate into the failure mechanism of fine-blanking process and to develop a methodology that can be used to predict failure in fine-blanking. The scope of this research work is to study the forming mechanism and failure characteristics occurring during fine-blanking based on theoretical modelling, numerical simulation, and experimental investigation.
520 $a In the numerical aspect, a step-wise and staggered decoupling strategy was adopted to handle coupling between mechanical deformation and temperature variation. Based on this strategy, an updated Lagrangian thermo-mechanical finite element programme together with a special designed local remeshing procedure has been successfully developed to solve large deformation problems. Using the programme, the fine-blanking process has been simulated.
520 $a In order to ensure the accuracy of simulation, the major process attributes such as vee-ring, ejector and the edge radii of the tools have been incorporated into the finite element model. From the numerical results, it has been realized that drastic variation of stress triaxiality during fine-blanking processes can cause material damage in the form of microcrack initiation, growth, and coalescence. By applying the concept of damage mechanics, the evolution of damage at different stages of fine-blanking has been estimated. The predicted value of damage energy density agrees with which has been published in related literature.
520 $a In order to measure the strain distribution for validating the numerical findings, the effective strain has been measured experimentally on the meridian plane of fine-blanked specimens. By using the photochemical etching method, a chessboard pattern mesh has been pre-etched on the cross-section of the specimens. After fine-blanking, the coordinates of specific points on the meridian plane of the fine-blanked specimen were recorded digitally and thus the deformation gradient at the points could be estimated. Furthermore, the effective strain was calculated in terms of the deformation gradient tensor. To make clear the evolution of microstructure in the shear zone, examinations of metallurgical microstructure by means of optical microscopy and SEM have been carried out. It has been observed that the grains were highly rotated and elongated in the plastic zone, whilst in the other regions equiaxed fine-grained microstructures remained approximately unchanged. The presence of voids and micro-cracks proved that material damage developed at the final stage of fine-blanking. Moreover, the existence of local recrystallized microstructure may imply that the severe plastic strain and temperature rise could cause recrystallization in fine-blanking processes. (Abstract shortened by UMI.)
590 $a School code: 1170.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Metallurgy. $3 1023648
690 $a 0743
690 $a 0794
710 2 0 $a Hong Kong Polytechnic (People's Republic of China). $3 1249353
773 0 $t Dissertation Abstracts International $g 63-10B.
790 $a 1170
790 1 0 $a Lee, Tai-Chiu, $e advisor
790 1 0 $a Tang, Chak-Yin, $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3066673