| [Coupled Continuum Mechanics ] Dynamic Forerunning Fracture In Dry and Fully Saturated porous Solids Dynamic Forerunning Fracture In Dry and Fully Saturated porous Solids Tao Ni1; Francesco Pesavento2; Mirco Zaccariotto1; Ugo Galvanetto2; Bernhard Schrefler3; 1UNIVERSITY OF PADUA, Padova, Italy; 2UNIVERSITY OF PADOVA, Padova, Italy; 3UNIVERSITY OF PADUA, Padua, Italy; PAPER: 229/Multiscale/Plenary (Oral) SCHEDULED: 15:55/Tue. 29 Nov. 2022/Similan 1 ABSTRACT: An FEM and a novel hybrid FEM and Peridynamic modelling approach are used to predict the forerunning fracture behavior in dry and saturated porous solids. Both mechanical loading case and fluid-driven fracture case are investigated. Under the action of the applied forces or fluid injection, a forerunning fracture event is observed in the structure. It will be shown that i) in dry bodies, the forerunning increases the overall fracturing speed and is, in fact, a mechanism for a crack to move faster when a steady-state propagation is no longer supported by the body/structure due to a high level of external forces; ii) in presence of the forerunning, interaction with the waves in the fluid phase increases the average speed even further comparing to the movement in the same dry bodies; iii) the forerunning is an undeniable source of stepwise crack tip advancement of the main crack in continuum models; and iv) the forerunning phenomenon deserves further scrutiny because of its importance in geophysics as far as earthquake events are concerned. References: Ni, T., Pesavento, F., Zaccariotto, M., Galvanetto, U., Schrefler , B.A.: Numerical simulation of forerunning fracture in saturated porous solids with hybrid FEM/Peridynamic model (accepted for pubblication in Computers and Geotechnics) Slepyan, L., Ayzenberg-Stepanenko, M., Mishuris G.: Forerunning mode transition in a continuous waveguide, J. Mech. Phys. Solids 78, 32–45 (2015) Milanese, E., Ni, T., Peruzzo C., Zaccariotto, M., Galvanetto, U., Mishuris, G. S., Schrefler B. A.: Forerunning and bridging in dry and saturated fracturing solids, in "Current Trends and Open Problems in Computational Mechanics" (F.Aldakheel, B. Hudobivnik, M. Soleimani, H. Wessels, C. Weissenfels, and M. Marino, eds), Springer, 2021 |
