Title: A multiscale simulation investigation of dislocation behaviour of PCD failure process

Authors: Jinxuan Bai; Qingshun Bai

Addresses: School of Mechanical and Electrical Engineering, Harbin Institute of Technology, 92 West Dazhi Street,Nan Gang District, 150001 Harbin, China ' School of Mechanical and Electrical Engineering, Harbin Institute of Technology, 92 West Dazhi Street,Nan Gang District, 150001 Harbin, China

Abstract: Although polycrystalline diamond (PCD) is ever viewed as brittle materials, it can present strong dislocation activity in certain condition. In this paper, the two dimensional discrete dislocation plastic (DDP) simulation under fully periodic boundary conditions was employed to study PCD dislocation behaviour. Crystal dissipation and entropy theory were introduced into the computational study to reveal dislocation density evolution and disordered sequence during PCD failure process. Our result showed that the developed model can capture the essential features of PCD dislocation evolution behaviour and realises accurate description of PCD failure process. Investigations of plastic dissipation and dislocation structure evolution reveal that the dislocation structure evolution plays a key role in the fracture process.

Keywords: polycrystalline diamond; PCD; discrete dislocation plastic; DDP; crystal dissipation; entropy; failure.

DOI: 10.1504/IJNM.2017.087539

International Journal of Nanomanufacturing, 2017 Vol.13 No.4, pp.384 - 393

Received: 09 Jan 2016
Accepted: 13 Sep 2016
Published online: 18 Oct 2017 *

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