8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

1/23

Good PracticeGood Practicein in

Abbas Bayatfar Abbas Bayatfar Assistant & Research Engineer Assistant & Research Engineer

SeptemberSeptember October 2014October 2014

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

2/23

ContentsContents

IntroductionIntroduction

FEFE ModellingModelling

Sep. - Oct. 2014

na ys sna ys sE erciseE ercise

2Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

3/23

FEM !e"initionFEM !e"inition

IntroductionIntroduction

The finite element method is a computer-based numerical technique typically used to solve field

problems in engineering and science.

The fundamental concept involves dividing the body under study (the domain of the solution) into a

Sep. - Oct. 2014

.

The approximated variation is quantified in terms of solution values at special locations across each

element which is called nodes .

3Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

4/23

FEM #rocedureFEM #rocedure

IntroductionIntroduction

Dividing the structure into a finite number of pieces (elements with nodes)

Describing the behaviour of physical quantities on each element

Sep. - Oct. 2014

whole structure

Solving the system of equations involving unknown quantities at the nodes (e.g. displacements)

Calculating desired quantities (e.g. strains and stresses) at selected elements

4Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

5/23

FEM So"t$are #ac%agesFEM So"t$are #ac%ages

IntroductionIntroduction

ANSYSELFEN

GENESIS

MSC/NASTRAN

ADINAABAQUS

ALGOR

SAMCEFSTARDYNE

MARC

NISA/DISPLAY

Sep. - Oct. 2014

STARS

PAM

FEM ApplicationsFEM Applications Static

Modal

Transient dynamics

Aerodynamics

Heat transfer

Fluid mechanics

Mechanisms

Fracture mechanics

Creep

Metal forming

Crashworthiness

5Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

6/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 6Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

7/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 7Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

8/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014

by RAPID

8Good Practice in FEM (by A. Bayatfar)

by REVA

by ICARE by RANS

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

9/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 9Good Practice in FEM (by A. Bayatfar)

by COMET

by FLUENT

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

10/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 10Good Practice in FEM (by A. Bayatfar)

by MSC/PATRAN

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

11/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 11Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

12/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 12Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

13/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 13Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

14/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 14Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

15/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 15Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

16/23

FEM ApplicationsFEM Applications

IntroductionIntroduction

Sep. - Oct. 2014 16Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

17/23

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

18/23

Ad&antages ' !ra$bac%s Ad&antages ' !ra$bac%s

IntroductionIntroduction

The FEM is applied to an approximation of the mathematical model of a system (the source of so-called

inherited errors)

Experience and judgment is needed in order to construct a good finite element model

Sep. - Oct. 2014

Input and output data may be large and tedious to prepare and interpret transient dynamics

18Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

19/23

E tent ' (eometryE tent ' (eometry

FE ModellingFE Modelling

Sep. - Oct. 2014 19Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

20/23

E tent ' (eometryE tent ' (eometry

FE ModellingFE Modelling

Sep. - Oct. 2014 20Good Practice in FEM (by A. Bayatfar)

from NAPA

from RhinoMarinefrom MAXSURF

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

21/23

E tent ' (eometryE tent ' (eometry

FE ModellingFE Modelling

Sep. - Oct. 2014 21Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

22/23

E tent ' (eometryE tent ' (eometry

FE ModellingFE Modelling

Sep. - Oct. 2014 22Good Practice in FEM (by A. Bayatfar)

8/11/2019 FEM Lecture_2014 [Compatibility Mode]-1

23/23

Mec)anical #roperties o" MaterialMec)anical #roperties o" Material

FE ModellingFE Modelling

200

300

400

500

600

S t r e s s [ N / m m ^ 2 ]

150

200

250

300

350

r e s s

[ N / m m

^ 2 ]

Sep. - Oct. 2014

0

100

0 0.212 2.802 7.312

Strain[%]

0

50

100

0 0.15 3

Strain [%]

S t

23Good Practice in FEM (by A. Bayatfar)