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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.8 P.1318~1323

10.1631/jzus.2006.A1318


Optimization design and residual thermal stress analysis of PDC functionally graded materials


Author(s):  CAO Pin-lu, LIU Bao-chang, YIN Kun, ZHANG Zu-pei

Affiliation(s):  College of Construction Engineering, Jilin University, Changchun 130026, China; more

Corresponding email(s):   jlucpl@sohu.com, liubc@jlu.edu.cn

Key Words:  Functionally graded materials (FGM), Optimum design, Polycrystalline diamond compact (PDC), Residual thermal stress, Finite element method (FEM)


CAO Pin-lu, LIU Bao-chang, YIN Kun, ZHANG Zu-pei. Optimization design and residual thermal stress analysis of PDC functionally graded materials[J]. Journal of Zhejiang University Science A, 2006, 7(8): 1318~1323.

@article{title="Optimization design and residual thermal stress analysis of PDC functionally graded materials",
author="CAO Pin-lu, LIU Bao-chang, YIN Kun, ZHANG Zu-pei",
journal="Journal of Zhejiang University Science A",
volume="7",
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pages="1318~1323",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.A1318"
}

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%T Optimization design and residual thermal stress analysis of PDC functionally graded materials
%A CAO Pin-lu
%A LIU Bao-chang
%A YIN Kun
%A ZHANG Zu-pei
%J Journal of Zhejiang University SCIENCE A
%V 7
%N 8
%P 1318~1323
%@ 1673-565X
%D 2006
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2006.A1318

TY - JOUR
T1 - Optimization design and residual thermal stress analysis of PDC functionally graded materials
A1 - CAO Pin-lu
A1 - LIU Bao-chang
A1 - YIN Kun
A1 - ZHANG Zu-pei
J0 - Journal of Zhejiang University Science A
VL - 7
IS - 8
SP - 1318
EP - 1323
%@ 1673-565X
Y1 - 2006
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2006.A1318


Abstract: 
The distribution of thermal stresses in functionally graded polycrystalline diamond compact (PDC) and in single coating of PDC are analyzed respectively by thermo-mechanical finite element analysis (FEA). It is shown that they each have a remarkable stress concentration at the edge of the interfaces. The diamond coatings usually suffer premature failure because of spallation, distortion or defects such as cracks near the interface due to these excessive residual stresses. Results showed that the axial tensile stress in FGM coating is reduced from 840 MPa to 229 MPa compared with single coating, and that the shear stress is reduced from 671 MPa to 471 MPa. Therefore, the single coating is more prone to spallation and cracking than the FGM coating. The effects of the volume compositional distribution factor (n) and the number of the graded layers (L) on the thermal stresses in FGM coating are also discussed respectively. Modelling results showed that the optimum value of the compositional distribution factor is 1.2, and that the best number of the graded layers is 6.

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Reference

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