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Frictional experiments of dolerite at intermediate slip rates with controlled temperature: Rate weakening or temperature weakening?

Noda, Hiroyuki and Kanagawa, Kyuichi and Hirose, Takehiro and Inoue, Atsuyuki (2011) Frictional experiments of dolerite at intermediate slip rates with controlled temperature: Rate weakening or temperature weakening? Journal of Geophysical Research B, 116 . B07306. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20110822-113326214

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Abstract

A rotary shear apparatus has been newly set up in Chiba University which can control the temperature near a sliding surface, T_meas, up to 1000°C independently from slip rate, V. Frictional experiments at 0.010 m/s, 1 MPa normal stress, and variable T_meas for dolerite have revealed a remarkable effect of temperature on the friction coefficient, f. With increasing T_meas, f starts from 0.7 to 0.8 at room temperature (RT), decreases down to 0.5–0.6 at 400°C, increases until 800°C, and then decreases again. We have also conducted XRD analyses of the wear materials (mainly submicron particles) and investigated microstructures of the sliding surfaces developed at different temperatures T_meas, and we found that there is a negative correlation between f and the amount of amorphous material except at RT and 1000°C. The generation of the amorphous phase probably causes the weakening. There is no amorphous phase recognized for a sample at 1000°C which is an aggregate of rounded crystals. EBSD analyses show that the material on the sliding surface at 1000°C contains randomly oriented hematite grains, which together with the observed microstructural features suggests that granular flow was taking place. We have also demonstrated that f depends not only on the instantaneous value of temperature, but also on its history. By comparing with conventional rotary shear friction experiment for the same dolerite without temperature control, we conclude that strong “rate weakening” as recently observed in high-velocity frictional experiments without an active control of the temperature has a significant amount of contribution from the temperature effect.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2010JB007945DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/2011/2010JB007945.shtmlPublisherUNSPECIFIED
Additional Information:© 2011 American Geophysical Union. Received 24 August 2010; revised 8 April 2011; accepted 29 April 2011; published 26 July 2011. We are sincerely grateful to T. Senda for his efforts to develop the apparatus and to move it to Chiba University, T. Shimamoto for his suggestions and efforts in arranging the setup of the apparatus, and T. Umino for her assistance with observations and analyses of samples and wear materials. We appreciate the comments by reviewers (N. De Paola and an anonymous reviewer) and by the Associate Editor D. Faulkner which improved this paper. This work is partly supported by Earthquake Research Institute, the University of Tokyo, through funds 2007‐A‐13 and 2008‐A‐14 in moving the apparatus from National Maritime Institute of Japan to Chiba University. This work is also supported by MEXT grant #21107004 and JSPS grant #23340151.
Funders:
Funding AgencyGrant Number
Earthquake Research InstituteUNSPECIFIED
MEXT21107004
Japan Society for the Promotion of Science (JSPS)23340151
University of Tokyo through National Maritime Institute of Japan 2007-A-13
University of Tokyo through National Maritime Institute of Japan 2008-A-14
Subject Keywords:earthquake generation process; effect of temperature; frictional experiment; frictional heating; rock friction
Record Number:CaltechAUTHORS:20110822-113326214
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110822-113326214
Official Citation:Noda, H., K. Kanagawa, T. Hirose, and A. Inoue (2011), Frictional experiments of dolerite at intermediate slip rates with controlled temperature: Rate weakening or temperature weakening?, J. Geophys. Res., 116, B07306, doi:10.1029/2010JB007945.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24976
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:22 Aug 2011 20:53
Last Modified:03 Oct 2019 03:01

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