@article{fdi:010070078,
  title = {{A} micromechanical model of rate and state friction : 2. {E}ffect of shear and normal stress changes},
  author = {{M}olinari, {A}. and {P}erfettini, {H}ugo},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n this paper we analyze the influence of shear and normal stress changes on frictional properties. {T}his problem is fundamental as, for instance, sudden stress changes are naturally induced on active faults by nearby earthquakes. {A}s any stress changes can be seen as resulting from a succession of infinitesimal stress steps, the role of sudden stress changes is crucial to our understanding of fault dynamics. {L}aboratory experiments carried out by {L}inker and {D}ieterich (1992) and {N}agata et al. (2012), considering steps in normal and shear stress, respectively, show an instantaneous response of the state variable (a proxy for the evolution of contact surface in our model) to a sudden stress change. {W}e interpret this response as being due to an (instantaneous) elastic response of the plastic and elastic contacts. {W}e assume that the anelastic response of the plastic contacts is frozen during sudden stress changes. {T}he contacts, which were driven by plasticity before the stress change, are elastically accommodated during the sudden variation of the load. {O}n the contrary, when the loading is slowly varying, elastic deformation of plastic contacts can be neglected. {O}ur model is able to explain the evolution law for the state variable reported by {L}inker and {D}ieterich (1992). {P}lain {L}anguage {S}ummary {I}n this paper we analyze the influence of shear and normal stress changes on frictional properties. {T}his problem is fundamental as, for instance, sudden stress changes are naturally induced on active faults by nearby earthquakes. {O}ur model is able to retrieve the {L}inker and {D}ieterich evolution law, which is a reference one that describes the evolution of friction under variable normal stress. {O}ur model assumption is that the plastic contacts that accommodate friction on a fault have an instantaneous elastic response to sudden changes in shear and normal stress. {T}his allows the extrapolation of our frictional model to fault scale.},
  keywords = {rate and state friction ; shear and normal stress changes ; elastic and ; plastic response},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {S}olid {E}arth},
  volume = {122},
  numero = {4},
  pages = {2638--2652},
  ISSN = {2169-9313},
  year = {2017},
  DOI = {10.1002/2016jb013307},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070078},
}