Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 55 12 2024 02 20 Study of the effect of penetration depth and disc speed on cutting forces using LS-DYNA simulations Study of the effect of penetration depth and disc speed on cutting forces using LS-DYNA simulations 2487 2502 5320 10.22060/ceej.2023.21617.7778 FA Shahin Fatahi Dehkbodi Master's student in rock mechanics, Mining engineering department, Amirkabir university of technology Ebrahim Farrokh Mining Engineering, Amirkabir University, Tehran, Iran Davood Lotfi Master of mechanical engineering-applied design, Director of research and development of Tunnelsaz machine Journal Article 2022 07 22 <span style="letter-spacing: .05pt;">The forces imparted upon cutting discs represent crucial design parameters for tunnel boring machines (TBMs) engaged in rock excavation processes. These forces comprise normal and rolling forces, which are influenced by factors including penetration depth, spacing, and linear and rotational velocity of the disc. Therefore, a careful examination of these forces is necessary for the design of effective TBMs. Linear cutting tests are time-consuming and financially prohibitive exercises. Consequently, precision numerical simulations can serve as a suitable alternative approach. In this report, the LS-DYNA software environment was employed to conduct simulations validating two constitutive models of concrete behavior: Johnson Holmquist (JHC) and RHT. The impact of variables such as penetration depth, and linear and rotational motion of the disc on exerted forces was investigated. The findings indicate penetration depth notably impacts both normal and rolling forces. Augmenting depth from 2.5mm to 7.6mm results in escalations of normal force from 96kN to 159kN and rolling force from 6.1kN to 22.5kN. As linear and rotational velocities of discs increase, forces decrease marginally. However, elevating linear speed from 0.33mm to 1.65mm precipitates merely a 13% reduction in normal force (from 155kN to 175kN) and 5% decrease in rolling force (from 20.6kN to 19.5kN), according to the results obtained.</span> <span style="letter-spacing: .05pt;">The forces imparted upon cutting discs represent crucial design parameters for tunnel boring machines (TBMs) engaged in rock excavation processes. These forces comprise normal and rolling forces, which are influenced by factors including penetration depth, spacing, and linear and rotational velocity of the disc. Therefore, a careful examination of these forces is necessary for the design of effective TBMs. Linear cutting tests are time-consuming and financially prohibitive exercises. Consequently, precision numerical simulations can serve as a suitable alternative approach. In this report, the LS-DYNA software environment was employed to conduct simulations validating two constitutive models of concrete behavior: Johnson Holmquist (JHC) and RHT. The impact of variables such as penetration depth, and linear and rotational motion of the disc on exerted forces was investigated. The findings indicate penetration depth notably impacts both normal and rolling forces. Augmenting depth from 2.5mm to 7.6mm results in escalations of normal force from 96kN to 159kN and rolling force from 6.1kN to 22.5kN. As linear and rotational velocities of discs increase, forces decrease marginally. However, elevating linear speed from 0.33mm to 1.65mm precipitates merely a 13% reduction in normal force (from 155kN to 175kN) and 5% decrease in rolling force (from 20.6kN to 19.5kN), according to the results obtained.</span> https://ceej.aut.ac.ir/article_5320_3a2a9aef4cbed81244820a091667c0bd.pdf