November 9, 2020 at 6:42 pmMinerSubscriber
(1) I am modeling a disc cutter (FEM) cutting rock block (SPH), and the interaction between rock and cutter is defined with *CONTACT_AUTOMATIC_NODES_TO_SURFACE, fs=fd=0.3. The expected rolling force (contact force in the Y direction) should be always positive or negative (depends on it from slave or master). However, my results show that the Y force fluctuates around zero. Could you give me some suggestions?November 10, 2020 at 4:22 pmFernando TorresSubscriberI can't answer it but may I ask you, what's the reason to go with LS-DYNA instead of Autodyn explicit? Thanks.nNovember 10, 2020 at 5:28 pmMinerSubscriberAcctually, I have no experience of Autodyna explicit. I followed sime literatures, LS-DYNA is widely used in cutting simulation.nNovember 10, 2020 at 6:52 pmChris QuanAnsys EmployeeThe roller has two motions: translation and rotation. These motions may pose different direction of the force. Suggest you running another two simulations: one with translation only and the other with rotation only. These two simulations will justify the force direction for each motion and may explain what you observed. nAbout the gap between SPH & FEM, will it disappear if you increase SPH particle density by reducing the particle size?.November 10, 2020 at 7:59 pmMinerSubscriberThanks for the reply. I tried these two conditions and It indeed that these two motions pose different direction of the force. If I decrease slightly the rotation speed, this issue will be resolved. In experiment, the rotation of cutter is driven by the friction from rock, which is different with numerical model.nYeah, the gap only appears when particles size is small.December 13, 2020 at 6:59 pmMinerSubscriberIn the previous model, contact between SPH and FEM is defined by part ID. The gap is addressed by changing PART to Node set (defined by the node at the lateral and bottom of the SPH part) and segment set (Surface of the FEM groove).nViewing 5 reply threads
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