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www.scion.lk 8/10/2014

Scion Engineering & Analytics 1

SolidWorks Simulation

Niranga Silva B.Sc. Eng. (Hons.), M.Eng.

Introduction

Learning Objectives

• What is Finite Element Analysis (FEA)?

• Objectives of FEA for Design Engineers

• Fundamentals Steps in an FEA Project

• A Closer Look at Finite Elements

• What is Calculated in FEA?

• How to Interpret FEA Results?

• von Mises Stress Failure Criterion

• Maximum Normal Stress Failure Criterion

• Units of Measure

• Using Online Help

• Limitations of SW Simulation Professional

8/10/2014 2 Scion Engineering & Analytics



What is Finite Element Analysis (FEA)?

• Numerical technique

• In Mechanical Engineering FEA is widely used for solving structural,

vibration and, thermal problems

• FEA is a deign tool, it should be concurrently used with the design

process.


Objectives of FEA for Design Engineers




Fundamentals Steps in an FEA Project


Fundamentals Steps in an FEA Project…




A Closer Look at Finite Elements


Solid Elements

A Closer Look at Finite Elements…






Shell Elements







Beam Elements



2D Elements





What is Calculated in FEA?


• Structural analysis – finds displacement, strain and stress

• Thermal analysis – temperature, temperature gradient and heat flow



How to Interpret FEA Results?


• Commonly used failure criteria

• von Mises Stress Failure Criterion

• Maximum Normal Stress Failure Criterion

von Mises Stress Failure Criterion




von Mises Stress Failure Criterion…


• Non-negative, scalar stress measure

• Based on von Mises-Hencky theory (Shear-Energy Theory, Maximum

Distortion Energy Theory)

von Mises Stress Failure Criterion…


• The theory states that a ductile material starts to yield at a location when

the von Mises stress becomes equal to the stress limit.

• In most cases, the yield strength is used as the stress limit.

• According to the von Mises failure criterion, the factor of safety (FOS) is

expressed as,



Maximum Normal Stress Failure Criterion


• By properly adjusting the angular orientation of the stress cube in

Figure 1-11, shear stress disappear and the state of stress is represented

only by three principal stresses.

• In SolidWorks Simulation, principal stresses are denoted as P1, P2, P3.

Maximum Normal Stress Failure Criterion…


• Used for brittle materials.

• They don’t have specific yield point

• Criterion assumes that the ultimate tensile strength of the material in

tension and compression is the same.

• Criteria predicts failure will occur when σ1 exceeds the stress limit,

usually the ultimate tensile strength.

• According to the Maximum principle stress failure criterion , the factor of

safety (FOS) is expressed as,



Units of Measure


Units of Measure…




Using Online Help


Limitations of SW Simulation Professional




Limitations of SW Simulation Professional…


END