Finite element mesh and load definition Óbuda University John von Neumann Faculty of Informatics Institute of Applied Mathematics Course Introduction to virtual engineering Lecture and laboratory 6. Finite element mesh and load definition László Horváth university professor http://users.nik.uni-obuda.hu/lhorvath/
Contents László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/ Lecture Concept of finite element analysis Completing part models for finite element analysis Finite elements and placing loads for analysis Concept of associative, parametric, and adaptive mesh Laboratory Introduction by studying typical FEA tasks (VE6.1/a-b) Creating and studying finite element mesh on a spatial surface (VE6.2) László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Concept of finite element analysis Approximation of location dependent parameters as design variables acting on the design performance on a finite number of finite elements Finite Element Modeling (FEM) creates extended part and assembly model for Finite Element Analysis (FEA) A numerical method Edge Node Calculation of parameters on nodes in a mesh László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Completing part models for finite element analysis (preprocessing) Definition of loads and boundary conditions Checking for consistency and correctness Optimizing mesh Preparation of FEM Selection of material properties Simplified regions Preparation of geometric Convert model from outside source New geometric model New entities model Hálógenerálás Mesh generation Controlled by engineer Automatic correction Automatic Refining mesh László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Finite elements and placing loads for analysis Mesh Elements One-dimensional Planar Shell Solid László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Finite elements modeling This FEM/FEA modeling and analysis are done as Laboratory task VE6.1/a. Part modeling is included in .ppt for lecture 8. László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Finite elements modeling László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Finite elements and placing loads for analysis Several frequently applied loads Concentrated and distributed force. Torque. Contact pressure. Acceleration (gravity, translation, rotation). Temperature on surface. Concentrated or distributed heat source. Magnetic. Placing loads and restraints Making simulation of real operating conditions possible. On mesh (at nodes). On geometry of the part (along lines and on surfaces). Mathematical expressions. Automatic contact recognition. Boundary conditions Mechanical restraints restrict movements in specified directions and result reaction forces. Definition of degrees of freedom. Non-restrained nodes have six degrees of freedom. László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Placing clamp restraint (DOF=0) on geometry László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Placing bearing load on geometry László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Placing distributed force load on geometry László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/ Compute the model László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/ Compute the model László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Concept of associative, parametric, and adaptive mesh Two-way associative connection between shape model and mesh for automatic change of the mesh in case of changed geometry. Mesh is characterized by parameters mainly for the definition of its dimensions. Adaptive mesh definition is an automatic modification of mesh density, element order, and element shape. Density can vary according to the load on each region. László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/ Visualize the mesh László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of solution and visualize color ranges László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Visualize with and without deformation László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Nodal values – details from different regions of the solid László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Finite element modeling and analysis Laboratory task VE6.1/b. László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of a mechanical part to be analyzed Slides 8-13 show main steps of the part definition. If you can not understand the definition process, please refer to relevant slide shows for the previous lectures or to the lecturer. Laboratory task VE6.2 includes definition of this part. László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of a mechanical part to be analyzed László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of a mechanical part to be analyzed László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of a mechanical part to be analyzed László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of a mechanical part to be analyzed László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of a mechanical part to be analyzed László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Definition of load and restraint in Finite Element Model (FEM) Laboratory task VE6.1/b includes definition of the subsequent FEM and FEA model. László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Visualization of mesh in Finite Element Model (FEM) László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Finite Element Analysis (FEM) László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Introduction by studying typical FEA tasks Source: www.catia.com László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Introduction by studying typical FEA tasks Source: www.catia.com László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Creating and studying finite element mesh on a spatial surface Laboratory task VE6.2 László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Creating and studying finite element mesh on a spatial surface László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Creating and studying finite element mesh on a spatial surface László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Creating and studying finite element mesh on a spatial surface László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/
Creating and studying finite element mesh on a spatial surface László Horváth ÓU-IAM http://users.nik.uni-obuda.hu/lhorvath/