Fatigue Case Studies

Fatigue Case Studies for Crack Initiation and Propagation Calculation

Fatigue Design and Evaluation Committee
Web Page: https://fde.uwaterloo.ca/Fde/CaseStudies/casestudies.html
Updated: Apr2020, Nov2020, Mar2024

The F.D.+E Committee has created many test case studies in the past
years to help improve the science of fatigue crack initiation and
crack propagation life prediction. A number of these past studies and
several from other sources are presented here. The intent is to allow
F.D.E members and students to test the validitiy of their prediction methods
and to enable the development of new software for fatigue analysis.
The items presented may contain errors and are meant for research only,
not for design.

Case 0: Edge Notched Plates Tested for Crack Initiation and Propagation
(Data from Ref.: L.Tucker, S.Bussa, SAE Paper 750038)
Case 0.1: Two Level Strain Control Axial Sample Tests (Ref.: J.Bonnen 1998)
Case 1: Edge Cracked Plates of Two Railway Steels (Ref.: M.Luke et al.)
Case 2: Center Notched Plates (Kt=2.5) of 40B Steel (Ref.: GKN Ltd, B. Dabell)
Case 4: Plate with Welded Transv. Stiffners, Bridge Steel 350W (Ref.: K.Ghahremani/S.Walbridge)
Case 5: Welded Plates with Cut-Outs TT-StE32 steel (Ref.: Heuler/Seeger 1983 )
- Case Description (to be documented)
  - Prediction/Simulation No. 2
Case 6: Plate with Welded Transv. Stiffener and Double Lap Joint, Bridge Steel 350W (Ref.: K.Ghahremani)
Case 8: DP600 Steel Compact Tension Specimen Crack Propagation (Ref.: L.C.H.Ricardo 2003)
- Case Description
Overview of FDE Weld Challenges 1,2,3,and 4 : Overview (9Mb pdf file) (Ref.: J.Bonnen )
F.D.+E. Weld Challenge 0: "Double Lap Weld Plate" (co-ordinator T. Cordes and P.Dindinger )
- Case Description
F.D.+E. Weld Challenge 1: "T tube" (co-ordinator T. Cordes and A.Conle )
- Case Description
- Simulations/Predictions: Overview
F.D.+E. Weld Challenge 2: "T tube + Variable Amplitude (VA)" (co-ordinator J. Bonnen )
- Case Description
- T-tube Strain Measurements (P.Kurath, M. ElZein )
- Simulations/Predictions: Overview
F.D.+E. Weld Challenge 3: "Exhaust System" ( co-ordinator P.Lubinsky )
- Case Description
- Simulations/Predictions: Overview (9Mb pdf file) (Ref.: J.Bonnen )"
F.D.+E. Weld Challenge 3b: "T tube + Shot Peened" (co-ordinator J. Bonnen )
- (to be documented)
F.D.+E. Weld Challenge 4: "Beam +" ( co-ordinator J.Bonnen )
- (to be documented)
F.D.+E. Weld Challenge 5: "Iowa 2x2 beam" ( co-ordinator R.Stephens )
- Case Description
- Simulations/Predictions:
F.D.+E. Bolt Challenge: "Bolt in Diaphram/Sheet metal" ( co-ordinator C.C.Chu and J.Bonnen )
- Overview
- (to be documented further)
F.D.+E. Weld Challenge 6: "Notched Beam" ( co-ordinator T.Cordes and D.Lingenfelser )
- Square Bar Notched/Weld Bending tests.
FD+E Total Life Project 1: "Welded T-Bar" (co-ordinator T.Cordes )
- Overview ( T.Cordes Oct.2012 )
- Simulations/Predictions: Overview of Results TBD
  - S.Mikheevskiy and T.Cordes( Spring 2013 6Mb pdf )
  - A.Conle ( Spring 2013 2Mb pdf )
  - Brad Cook TBar Analysis(1.3Mb pdf)
- (to be documented further)
FD+E Total Life Project 2: "Machined T-Bar" (co-ordinator T.Cordes )
- Loads:
  - Total Life Variable Ampl. History Plot
  - Total Life Variable Ampl. History (*.txt)
  - Block Test history plot
  - Block Test history (*.txt)
  - Block Test history rainflow (*.txt)
- Simulations/Predictions:
  - T.Cordes and S.Mikheevskiy Spring 2014 FDE pres. pdf
  - A.Conle Spring 2014 FDE pres. pdf
Case 10: Notched steel specimens with net section plasticity:
- F.A.Conle, C.D.Bridge, "Application of the Local Stress-Strain-Life Approach
  to a High-Low Loading Test Series of a Coiled Tubing Steel,"
  Report to API-17G2 committee, Nov. 4 2020.
- C.D Bridge,"Combining Elastic and Plastic Fatigue Damage
  in Coiled Tubing," Soc. Petro. Engr. SPE 142427,
  Presented at the SPE/ICoTA Coiled Tubing and Well Intervention
  Conf. The Woodlands, Texas, USA, 5-6 April 2011.

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