A computationally efficient numerical model for a dynamic analysis of beam type structures based on the combined finite-discrete element method

2018 ◽  
Vol 49 (5) ◽  
pp. 651-665 ◽  
Author(s):  
H. Smoljanović ◽  
I. Uzelac ◽  
B. Trogrlić ◽  
N. Živaljić ◽  
A. Munjiza
Keyword(s):  
Numerical Model ◽  
Discrete Element Method ◽  
Dynamic Analysis ◽  
Discrete Element ◽  
Computationally Efficient ◽  
Beam Type ◽  
Element Method

Nonlinear Dynamic Analysis of Space Frame Structures by Discrete Element Method

2014 ◽  
Vol 638-640 ◽  
pp. 1716-1719 ◽  
Author(s):  
Nian Qi ◽  
Ji Hong Ye
Keyword(s):  
Discrete Element Method ◽  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Discrete Element ◽  
Internal Force ◽  
Frame Structures ◽  
Space Frame ◽  
Bond Model ◽  
Element Method

This document explores the possibility of the discrete element method (DEM) being applied in nonlinear dynamic analysis of space frame structures. The method models the analyzed object to be composed by finite particles and the Newton’s second law is applied to describe each particle’s motion. The parallel-bond model is adopted during the calculation of internal force and moment arising from the deformation. The procedure of analysis is vastly simple, accurate and versatile. Numerical examples are given to demonstrate the accuracy and applicability of this method in handling the large deflection and dynamic behaviour of space frame structures. Besides, the method does not need to form stiffness matrix or iterations, so it is more advantageous than traditional nonlinear finite element method.

scholarly journals An extended discrete element method for the estimation of contact pressure at the ankle joint during stance phase

2020 ◽  
Vol 234 (5) ◽  
pp. 507-516 ◽  
Author(s):  
Ivan Benemerito ◽  
Luca Modenese ◽  
Erica Montefiori ◽  
Claudia Mazzà ◽  
Marco Viceconti ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Contact Pressure ◽  
Ankle Joint ◽  
Discrete Element ◽  
Elastic Behaviour ◽  
Computationally Efficient ◽  
Element Analysis ◽  
Joint Contact Pressure ◽  
Element Method

Abnormalities in the ankle contact pressure are related to the onset of osteoarthritis. In vivo measurements are not possible with currently available techniques, so computational methods such as the finite element analysis (FEA) are often used instead. The discrete element method (DEM), a computationally efficient alternative to time-consuming FEA, has also been used to predict the joint contact pressure. It describes the articular cartilage as a bed of independent springs, assuming a linearly elastic behaviour and absence of relative motion between the bones. In this study, we present the extended DEM (EDEM) which is able to track the motion of talus over time. The method was used, with input data from a subject-specific musculoskeletal model, to predict the contact pressure in the ankle joint during gait. Results from EDEM were also compared with outputs from conventional DEM. Predicted values of contact area were larger in EDEM than they were in DEM (4.67 and 4.18 cm2, respectively). Peak values of contact pressure, attained at the toe-off, were 7.3 MPa for EDEM and 6.92 MPa for DEM. Values predicted from EDEM fell well within the ranges reported in the literature. Overall, the motion of the talus had more effect on the extension and shape of the pressure distribution than it had on the magnitude of the pressure. The results indicated that EDEM is a valid methodology for the prediction of ankle contact pressure during daily activities.

Simulation for Silos Discharge with 2D DEM

2011 ◽  
Vol 236-238 ◽  
pp. 2721-2724
Author(s):  
Shou Yi Bi ◽  
Xing Pei Liang
Keyword(s):  
Numerical Model ◽  
Discrete Element Method ◽  
Static Pressure ◽  
Lateral Pressure ◽  
Dynamic Pressure ◽  
Discrete Element ◽  
Particle Flow ◽  
Static Equilibrium State ◽  
Good Agreement ◽  
Element Method

In this paper, using the discrete element method (PFC2D)particle flow procedure to establish a model of cylindrical silo, in the warehouse filled with particles within the reach of static equilibrium state, then the record of its wall static lateral pressure measurement value, while monitoring the measured dynamic wall pressure during the silo discharging. It was shown that the static pressure as well as the dynamic pressure simulated with the numerical model is in good agreement with the experimental results. So the discrete element method can give a new way to study dynamic question of silos.

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