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Determination and modeling of residu...

Tahvilian, Leila.

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Determination and modeling of residual stress in functionally graded WC-Co.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Determination and modeling of residual stress in functionally graded WC-Co./
作者:	Tahvilian, Leila.
面頁冊數:	176 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
Contained By:	Dissertation Abstracts International75-09B(E).
標題:	Engineering, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3621568
ISBN:	9781303927584

Determination and modeling of residual stress in functionally graded WC-Co.
Tahvilian, Leila.

Determination and modeling of residual stress in functionally graded WC-Co. - 176 p.

Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.

Thesis (Ph.D.)--The University of Utah, 2014.

Gradual variations in composition and/or structure through the volume of functionally graded materials (FGMs) generally result in corresponding continuous spatial variations in mechanical/physical properties, and often in significant residual stresses that develop during processing. Due to inhomogeneous properties in these materials, residual stress measurement in FGMs can be a very challenging problem. In this study, residual stresses in functionally graded cemented tungsten carbide (FG-WC-Co) were investigated by numerical, analytical and experimental approaches by means of a layer removal technique. The numerical method consisted of finite element analysis (FEA) modeling for the FGM plate, in order to calculate residual stress distribution over the volume and to develop a method for predicting residual stress levels in closely related materials. The analytical procedure embodied a mathematical approach to determine residual stress distributions, and analytically determined values are compared with those obtained from FEA modeling and experimental results. The experimental approach consisted of fabricating and heat treating FG-WC-Co flat samples, then measuring strain changes by strain gauge after each sequential layer removal from the opposite side of the specimen from the graded region. Good agreement was found between analytical, numerical and experimental results.

ISBN: 9781303927584Subjects--Topical Terms:

1020744
Engineering, General.

Determination and modeling of residual stress in functionally graded WC-Co.
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100 1 $a Tahvilian, Leila. $3 3169345
245 1 0 $a Determination and modeling of residual stress in functionally graded WC-Co.
300 $a 176 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-09(E), Section: B.
500 $a Advisers: Zhigang Zak Fang; K. S. Ravi Chandran.
502 $a Thesis (Ph.D.)--The University of Utah, 2014.
520 $a Gradual variations in composition and/or structure through the volume of functionally graded materials (FGMs) generally result in corresponding continuous spatial variations in mechanical/physical properties, and often in significant residual stresses that develop during processing. Due to inhomogeneous properties in these materials, residual stress measurement in FGMs can be a very challenging problem. In this study, residual stresses in functionally graded cemented tungsten carbide (FG-WC-Co) were investigated by numerical, analytical and experimental approaches by means of a layer removal technique. The numerical method consisted of finite element analysis (FEA) modeling for the FGM plate, in order to calculate residual stress distribution over the volume and to develop a method for predicting residual stress levels in closely related materials. The analytical procedure embodied a mathematical approach to determine residual stress distributions, and analytically determined values are compared with those obtained from FEA modeling and experimental results. The experimental approach consisted of fabricating and heat treating FG-WC-Co flat samples, then measuring strain changes by strain gauge after each sequential layer removal from the opposite side of the specimen from the graded region. Good agreement was found between analytical, numerical and experimental results.
520 $a Furthermore, thermal residual stress distribution in FG-WC-Co hollow cylinder was examined with an emphasis on the effects of key variables, the gradient profile and the gradient thickness, on the magnitude and distribution of the stress field. An analytical direct solution based on solving the governing equations of a cylinder composed of a uniform inner core and a functionally graded outer shell was developed. The cylindrical compound was considered as two separate elements: homogeneous cylinder and functionally graded shell. Material properties, such as the elastic modulus and the coefficient of thermal expansion (CTE), were considered to vary as a power function of the radius, and proper mechanical boundary conditions were imposed at the interface of the cylinders.
520 $a Finally, having validated the FEA model for the FGM plate, the FEA model approach was investigated for more complex geometries, such as cylindrical and dome-top inserts, and the effects of different design and geometric parameters on the distribution of residual stress are presented.
590 $a School code: 0240.
650 4 $a Engineering, General. $3 1020744
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0537
690 $a 0794
690 $a 0548
710 2 $a The University of Utah. $b Metallurgical Engineering. $3 2094992
773 0 $t Dissertation Abstracts International $g 75-09B(E).
790 $a 0240
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3621568