<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Yuke Liu</style></author><author><style face="normal" font="default" size="100%">Yongqiang Xiong</style></author><author><style face="normal" font="default" size="100%">Kouqi Liu</style></author><author><style face="normal" font="default" size="100%">Chao Yang</style></author><author><style face="normal" font="default" size="100%">Pingan Peng</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Indentation size and loading rate sensitivities on mechanical properties and creep behavior of solid bitumen</style></title><secondary-title><style face="normal" font="default" size="100%">International Journal of Coal Geology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Creep</style></keyword><keyword><style  face="normal" font="default" size="100%">Mechanical properties</style></keyword><keyword><style  face="normal" font="default" size="100%">Nanoindentation</style></keyword><keyword><style  face="normal" font="default" size="100%">Solid bitumen</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2019</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/pii/S0166516219304100</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">216</style></volume><pages><style face="normal" font="default" size="100%">103295</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Creep behavior of rocks could impair fracture conductivity and wellbore stability during gas production from highly matured organic-rich shales in South China, of which the organic matter is mainly in the form as solid bitumen and is thought to be a major contributor for the creep deformation. To get a better insight into this phenomenon, this paper for the first time characterizes the mechanical properties and creep behavior of a millimeter-sized solid bitumen sample by using quasi-static state creep tests and Dynamic Mechanical Analysis in nanoindentation, and reports their dependences on indentation size and loading rate, respectively. Mechanical properties (including hardness and Young&amp;#039;s modulus) are found to be negatively related with both indentation size and loading rate. The extremely small creep strain rate sensitivity (m) of solid bitumen indicates a localized shear flow inside. And m exhibits slightly positive dependences on indentation size and loading rate. The potential mechanisms controlling the deformation of solid bitumen under indentation are also discussed.</style></abstract></record></records></xml>