| Optimization design and residual thermal stress analysis of PDC functionally graded materials |
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| 作者姓名： | CAO Pin-lu LIU Bao-chang YIN Kun ZHANG Zu-pei |
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| 作者单位： | CAO Pin-lu?1，2，LIU Bao-chang??1，2，YIN Kun1，ZHANG Zu-pei1 (1College of Construction Engineering，Jilin University，Changchun 130026，China) (2Key Laboratory of Geo-exploration Instrumentation，Ministry of Education，Changchun 130026，China) |
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| 基金项目： | Research Program in the Ninth National Five-Year-Plan of Ministryof Land and Resources, China |
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| 摘 要： | INTRODUCTION Polycrystalline diamond compacts (PDC), con-sisting of a polycrystalline diamond (PCD) layer on a WC-Co substrate, and having high hardness and abrasive resistance, are used in a variety of drilling and machining applications (Farhad, 2001; Sadi and Muzaffer, 2001). However, due to differences of thermal and mechanical properties in diamond and WC-Co substrate, residual thermal stresses develop in regions near the interfaces during fabrication. The diamond coating exhib…
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| 关 键 词： | 功能梯度材料 优化设计 PDC 钻头 FGM |
| 收稿时间： | 2006-02-21 |
| 修稿时间： | 2006-05-26 |
Optimization design and residual thermal stress analysis of PDC functionally graded materials |
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| 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,2006,7(8):1318-1323. |
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| Authors: | Pin-lu Cao Bao-chang Liu Kun Yin Zu-pei Zhang |
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| Institution: | (1) College of Construction Engineering, Jilin University, Changchun, 130026, China;(2) Key Laboratory of Geo-exploration Instrumentation, Ministry of Education, Changchun, 130026, China |
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| 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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| Keywords: | Functionally graded materials (FGM) Optimum design Polycrystalline diamond compact (PDC) Residual thermal stress Finite element method (FEM) |
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