09/07/04DV Training June 20041 Corporate Training Programme Module 1 Training Programme Overview.
Training Programme on FE Analysis …
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Transcript of Training Programme on FE Analysis …
Design & Technology CenterVedam
DAY - 1: Introduction to Structural Analysis and FEM
DAY - 2: Introduction to ANSYS structure classic GUI:
DAY - 3: Pre-processing and creation of model:
DAY - 4: Pre-processing and creation of model
DAY - 5: Analysis result and post-processing:
DAY - 6: Analysis result and post-processing
Training Programme on FE Analysis …
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VedamVEDAM DESIGN & TECHNICAL CONSULTANCY PVT. LTD.
504-506, Acropolis, Military Road, Marol, Andheri (E), Mumbai-59, INDIA
+91-22-67109192 , +91-22- 67257237 [email protected], www.vedamindia.comDated –
Design & Technology Center
Introduction to Finite Element Analysis
Presented by – Rakesh Roy
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Layout What is FEA ??
Theory behind FEA
Types of FEA or Usage
Working with FEA tools
Advantage/Limitations of FEA
Scope in Marine & Offshore industry
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Problem Hand Sketch
Prelim Design
FEM Analysis Product
Engineering Problem Solving
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Optimisation Final Result Model Test Prototype
Test Production
Design & Technology CenterVedamStructural Problem Solving
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Design & Technology CenterVedamFEA… Finite Element Analysis
Finite element method – approximates the physics - numerical procedure for solving a continuum mechanics problem with acceptable accuracy
Subdivide a large problem into small elements connected by nodes
Adjacent element share DOF at connecting nodes
Design & Technology CenterVedam Assume a simple polynomial behavior in each element
Works on equilibrium at nodes → matrix equations →solve for nodal values (disp.)
FEA… Theory
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DOF = Elemental Degrees of Freedom (typically 2 – 6 depending on the element)
◦ 2D Bar/Spar/Truss = 2 Node, 2 DOF (Translation)◦ Spring = 2 Node, 2 DOF (1 Translational + 1 Rotational)◦ 3D Beam = 3 Node, 6 DOF (3 Translational + 3
Rotational)◦ Shell4 = 4 Node, 6 DOF (3 Translational + 3 Rotational)◦ Solid = (8 – 20 Node) 3 DOF (3 Translational)
DOF… Degree of Freedom
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Linear (small displacement, linear materials) Nonlinear (large displacement, nonlinear material properties)
Static or yield stress analysis Linear or nonlinear Dynamics
◦ Frequency analysis◦ Random vibration analysis
Buckling Thermal and heat transfer Fluid mechanics Electromagnetics Optimization
Types of FEA
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Working with FEA tools..
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Preprocessor…
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Preprocessor….
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Process & Postprocessor….
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Can handle very complex geometry – the power of FEM Can handle wide variety of engineering problems with inter-
dependency◦ Solid mechanics◦ Dynamics◦ Heat problems◦ Fluids◦ Electrostatic problems
Can handle complex restraints – indeterminate structures Can handle complex loading
◦ Nodal load (point load)◦ Element load (pressure, thermal, inertia)◦ Time or frequency dependent loading
Advantage of FEA
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Approximate Solution
Field quantities are assumed to be polynomial, which is not true
Limitations of FEA
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Finite number of digits
Numerical difficulties – very large stiffness difference
Limitations of FEA
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Design & Technology CenterVedam Wrong element selection
Distorted elements or meshing problem
Insufficient support/improper boundary condition
Inconsistent units (e.g. E=200GPa, Force= 1 lbs)
Decoding the result – fancy, colourful result but wrong
Possible mistakes by user
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Design & Technology CenterVedam Complex structures
Impossible to make prototype
Difficult to scale down all details to model level
Complex problem… non-linear load, heat, fluid, vibration
Huge cost advantage with reduction in material (optimisation)
Scope in Marine industry..
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Global hull
3 Cargo Hold
Offshore structure◦ MODU◦ Jacket Leg Structure
Stress analysis…Global
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Foundation of heavy equipment◦ Crane◦ Helideck◦ Windlass
Offshore◦ Top side foundations◦ Pipe line◦ Drilling unit
Stress analysis… local
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Buckling
Rupture/Failure Analysis
Vibration/Modal analysis
Impact Analysis
Fatigue
Special analysis…
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Slamming
Sloshing
Propeller Induced load
Fluid Structure Interaction… FSI
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In short…
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Marine design can’t live without FEA
Marine Consulting | Basic Design | Production Design | Conversion Design | New Building & Repair Supervision | Stability Analysis | Structural FEM Analysis | Mooring Analysis | Shipboard Manuals | Inclining Experiment |
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THANK YOU