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Your search keyword '"Zhou, Huifeng"' showing total 9 results
Start Over Author "Zhou, Huifeng" Publisher elsevier bv
9 results on '"Zhou, Huifeng"'

2. Numerical investigations on the effect of ultra-high cutting speed on the cutting heat and rock-breaking performance of a single cutter

Author

Kai Zhang, Gao Mingyang, Zheng Guojing, Qin Zhou, Zhou Huifeng, and Baolin Liu

Subjects
Materials science, Mechanical engineering, Drilling, 02 engineering and technology, 010502 geochemistry & geophysics, Geotechnical Engineering and Engineering Geology, 01 natural sciences, Finite element method, Stress (mechanics), Fuel Technology, Brittleness, 020401 chemical engineering, Heat flux, Thermal, Specific energy, 0204 chemical engineering, Exploration diamond drilling, 0105 earth and related environmental sciences
Abstract

As a new drilling technology, the ultra-high-speed diamond drilling can exhibit great superiority in drilling deep hard rock, which can achieve high rates of penetration (ROP) with substantially lower energy and load. In order to better understand the removal mechanism, the effect of ultra-high cutting speed on the cutting heat and rock-breaking performance of a single cutter was investigated by using ABAQUS software. A thermal elastoplastic damage model has been established by using a finite element analysis system aiming at the linear cutting operations. The changes of stress state, strain accumulation, and heat migration in the tool unit were analyzed. The results show that when the cutting speed exceeds 8 m/s, the heat flux and mechanical specific energy (MSE) decrease as the rotary speed (RPM) increases. That is, when cutting at ultra-high linear speed (>8 m/s), more input energy was used to break rock. In addition, when the cutting speed is in the ultra-high-speed stage and continues to increase, the proportion of brittle failure of the rock will gradually increase, and a new balance will not be reached until the cutting speed reaches 12 m/s, which helps to improve the rock breaking efficiency.

Published
2020

4. KIR2DS4 and Its Variant KIR1D Are Associated with Acute Graft-versus-Host Disease, Cytomegalovirus, and Overall Survival after Sibling-Related HLA-Matched Transplantation in Patients with Donors with KIR Gene Haplotype A

Author

Wu, Xiaojin, primary, Yao, Yao, additional, Bao, Xiaojing, additional, Zhou, Huifeng, additional, Tang, Xiaowen, additional, Han, Yue, additional, Ma, Xiao, additional, Liu, Yuejun, additional, Chen, Jia, additional, Zhou, Haixia, additional, Jing, Song, additional, Gu, Bing, additional, Xu, Yang, additional, Sun, Aining, additional, He, Jun, additional, and Wu, Depei, additional

Published
2016
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