Multiscale modeling of thermo-mechanical coupling problems in granular media

• Main Authors: Zhao, Jidong, Zhao, Shiwei, Liang, Weijian
• Format: Conference Object
• Language: English
• Published: 2022
• Subjects: Methane hydrate; permafrost
• Online Access: https://repository.hkust.edu.hk/ir/Record/1783.1-125812; http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=&rft.volume=&rft.issue=&rft.date=2022&rft.spage=&rft.aulast=Zhao&rft.aufirst=Jidong&rft.atitle=Multiscale+modeling+of+thermo-mechanical+coupling+problems+in+granular+media&rft.title=

Heat generation and transfer may couple with the mechanical response of granular materials, affecting the operation and performance of a wide range of relevant engineering applications. Typical examples in geotechnical engineering include methane hydrate extraction from deep seabed bearing soils and freeze-thaw in economically important permafrost and among others. In this talk, we present a computational multiscale modeling approach based on coupled material point method (MPM) and discrete element method (DEM) to simulate the thermo-mechanical coupling behavior in granular media. The DEM is enriched with three general thermomechanical processes, thermally induced stress due to grain expansion/contract, heat generation by inter-particle friction dissipation, and temperature-sensitive inter-particle bond melting. The MPM is fed by DEM at each material point with temperature and loading path dependent constitutive responses based on location and loading history specific DEM solutions. Benchmark and demonstrative examples show the coupled scheme offer a physics-based, natural scale-crossing pathway to capture the complicated coupled thermo-mechanical responses of granular media.