Download presentation

Presentation is loading. Please wait.

Published byOsborn Mason Modified over 2 years ago

1
FE Post Processing Plotting Campbell Diagram Goodman Diagram Fracture Yield Principal Stress

2
POST PROCESSING PLOTS

3
Deformed Shape Plot

4
Contour Plots

5
History Plot

6
Invert Colors for Hard Copies

7
CAMPBELL DIAGRAMS

8
Campbell Diagram

9
Probabilistic Campbell Diagram

10
GOODMAN DIAGRAMS

11
Inputs Include Material: – Ultimate tensile strength, – Yield stress – 0.2%, – High cycle fatigue strength, Loads – Steady stress, – Vibratory, Half amplitude, zero-peak, Full amplitude, peak-peak,

12
Load Inputs

13
HCF Test Data Fit R=-1 data – For example: Pick number of cycles to failure: N f Solve for corresponding half-amplitude stress:

14
Goodman Diagram Material Inputs

15
My Choice

16
FRACTURE MECHANICS

17
Fracture Modes

18
Stress Intensity Factor Mode I Stresses near crack tip are singular and vary as the inverse square root of distance from crack tip K I is the stress intensity factor

19
Fracture – ¼ Points

20
Modeling Cracks

21
VON MISES STRESS & PLASTIC YIELDING

22
Von Mises Stress is the stress tensor is the equivalent hydrostatic pressure is the deviatoric stress

23
Invariants of Stress Invariants do not change values when coordinate system is rotated. The first invariant of the stress is The second invariant of the deviatoric stress is The third invariant of the deviatoric stress is the determinant.

24
Uniaxial Tension :yield stress

25
Equivalent Mises Stress Yielding occurs when Or when equivalent stress When yielding occurs Stress ratio is

26
PRINCIPAL STRESSES

27
Principal Stresses Eigenvalues of stress tensor (matrix) are principal stresses – All values are real – Order is 1:maximum, 2: intermediate, 3:minimum Associated eigenvectors are normal to face Use maximum principal stress for fracture 11 22 33 x y z

28
STRESS CONTOURS

29
Ansys Stress Contour Plots

30
FE Post Processing Plotting – Includes displaced, contour, and scatter plots Campbell Diagram – Finds important resonances Goodman Diagram – Predicts high cycle fatigue life Fracture – Indicates failure due to crack propagation Yield – Establishes yield through the use of equivalent (Mises) stress Principal Stress – Aids in determining failure due to presence of flaws

Similar presentations

OK

Mechanics of Materials(ME-294) Lecture 12: YIELD and Failure CRITERIA.

Mechanics of Materials(ME-294) Lecture 12: YIELD and Failure CRITERIA.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Laser video display ppt on ipad Ppt on power grid failure in india 2012 full Ppt on pathophysiology of obesity Ppt on review of related literature sample Ppt on cash flow statement Ppt on indian sign language Ppt on verb forms and tenses Download ppt on layers of atmosphere Alternative fuels ppt on automobiles Download ppt on wind energy powerpoint