DOI: 10.1002/2016GL069053
论文题名: Is frictional heating needed to cause dramatic weakening of nanoparticle gouge during seismic slip? Insights from friction experiments with variable thermal evolutions
作者: Yao L. ; Ma S. ; Niemeijer A.R. ; Shimamoto T. ; Platt J.D.
刊名: Geophysical Research Letters
ISSN: 0094-8905
EISSN: 1944-8636
出版年: 2016
卷: 43, 期: 13 起始页码: 6852
结束页码: 6860
语种: 英语
英文关键词: dynamic weakening
; flash heating
; high-velocity friction
; nanoparticles
; powder lubrication
; superplastic deformation
Scopus关键词: Dynamics
; Friction
; Heating
; Lubrication
; Magnesia
; Marble
; Nanoparticles
; Superplastic deformation
; Tribology
; Dynamic fault weakening
; Flash heating
; Friction experiments
; Frictional heating
; High-velocity frictions
; Powder lubrication
; Thermal evolution
; Variable temperature
; Thermal conductivity
; asperity
; dynamic property
; fault gouge
; friction
; heating
; marble
; nanoparticle
; periclase
; plastic
; temperature anomaly
; Carrara
; Italy
; Massa-Carrara
; Tuscany
英文摘要: To examine whether faults can be lubricated by preexisting and newly formed nanoparticles, we perform high-velocity friction experiments on periclase (MgO) nanoparticles and on bare surfaces of Carrara marble cylinders/slices, respectively. Variable temperature conditions were simulated by using host blocks of different thermal conductivities. When temperature rises are relatively low, we observe high friction in nano-MgO tests and unexpected slip strengthening following initial weakening in marble slice tests, suggesting that the dominant weakening mechanisms are of thermal origin. Solely the rolling of nanoparticles without significant temperature rise is insufficient to cause dynamic fault weakening. For nano-MgO experiments, comprehensive investigations suggest that flash heating is the most likely weakening mechanism. In marble experiments, flash heating controls the unique evolutions of friction, and the competition between bulk temperature rise and wear-induced changes of asperity contact numbers seems to strongly affect the efficiency of flash heating. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978076929&doi=10.1002%2f2016GL069053&partnerID=40&md5=fc4ee0805e6c6784eaa35b551ebc70ab
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9868
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China
Recommended Citation:
Yao L.,Ma S.,Niemeijer A.R.,et al. Is frictional heating needed to cause dramatic weakening of nanoparticle gouge during seismic slip? Insights from friction experiments with variable thermal evolutions[J]. Geophysical Research Letters,2016-01-01,43(13).