Non-linear and Linear Finite Element Analysis by

Chetan Harsha Edara

Non-linear Analysis to determine decrement in bolt pretension due to operating loads1/12 Symmetry ModelActual CAD Model

Highlights of simulation:• Non-linear Simulation considering contact (frictional ) non-linearity • Material Nonlinearities are not simulated • The actual model reduced to 1/12th symmetric model to reduce

computation time ( since model is symmetric with respect to geometry and applied loads this can be done )

• Based on the simulation ,the Pretension of the Bolt is observed to be decreased from 1500 lb. to 1400 lb. due to the operating loads on the system

• The sliding distance between the bolt head and the flanges are observed in the simulation considering a frictional coefficient of 0.25Sliding Distance observed between the bolt head and flange

contact surfaces Total Deformation observed in the assembly

Meshed with higher order elements for more accuracy and convergence in non –linear simulations

•Problem Statement:Create beam/shell model of a typical metal shop tool shelf .The functional requirement of this shelf: No single panel may “sag” more than ½” under a 600 lbf loadVerify (or determine):

•The weight of the shelf•That beam stresses using ANSYS Analysis

Analysis Results :The Bending stress in the beams and plates of the storage shelf are determined using Ansys Simulation and the results are validated with analytical results

Storage Shelf Structural Analysis with Beam /Shell Elements

Boundary Conditions-Self weight of the shelf acting under gravity

Determine the force v/s displacement curve for a paperclip subjected to a cyclic loading ( both loading andunloading conditions ) considering the material plasticity

Actual CAD Model Boundary ConditionsMulti-linear Isotropic Hardening data input to Ansys to model plastic behavior

Equivalent Stress in the paper clip Greater than yield stress Equivalent Plastic Strain in the paper clip stress

Force v/s Displacement graph generated in excel based on the data points obtained from ANSYS simulation

Highlights of simulation:• Non-linear Simulation considering plastic behavior of the paper clip • Permanent plastic deformation exhibited by clip when force is removed

has been estimated from Force v/s Displacement curve

Directional Deformation V/s Reaction force data generated from Simulation used for Force v/s Displacement graph

Hyper elastic Material Modelling in Ansys from test data and perform Hyper elastic analysis of rubber specimen

Input of Uni-axial ,Bi-axia and shear test data of hyper elastic material into Ansys

Curve fitting of test data in Ansys using yeoh 3rd order model for hyperelastic material

1/8th symmetric model of Rubber Test Specimen for Analysis

Stress –strain behavior of the rubber specimen obtained from Ansys Simulation

Highlights of simulation:• Idea of this project is to model a hyper -

elastic material based on uni-axial ,bi-axial and shear test data and use that test data to perform analysis on new specimens with different dimensions under various loads using Finite Element Analysis

Determined the natural frequencies for a compressor blade from a gas turbine engine. Pre-stress effects from both a rotational velocity load as well as pressures determined from a computation fluid dynamics analysis performed are included for Natural Frequency calculation

CAD Model of turbine blade CFD analysis to determine pressure distribution

Imported the Pressure distribution as a load for static structural analysis to determine pre-stress

Pre-stress found out in static structural analysis

Modal Analysis of the pre-stressed blade

Multi-domain simulation performed to determine the prestressed natural frequencies of the blade.