Case Studies 2: Short Variable Ampl. History, Kt=2.5 Plate Steel



Fatigue Design and Evaluation Committee member: B.Dabell
Web Page: http://fde.uwaterloo.ca/Fde/CaseStudies/GKN_Case2/gknCase2.html
Data Reference: Contributed to Fatigue Design and Evaluation committee by GKN UK.

Material

The material is a Material BS 4360-40B Steel.
 

Nominal Chem.:  

       appears to be  0.17C wt% 1.40Mn max, .045P max, .045 Smax

 Which is roughly a AISI or SAE 1522 or CSA G40.12 for which data exists
                          here 


Geometry

 
 Steel Plate with circular center notch

                 Kt = 1.0

Load History (repeated):




Fig. 1: GKN Notched plate load history.


Test Results



# Experimental Plate Test Results: 
#      Test Level             Test Life  Blocks
#    ABS(Nom. Stress Rg)     (history repetitions)
#        69.0 ksi                     450
#        51.5                        2206
#        90.5                          65
#        44.8                        4425
#        39.6                        9849

#        51.5 (with +21.47 mean)     1126
#        39.6 (with -21.47 mean)   125000 #runout
#
#Numbers below: Max.Range= 100 Units (Thus max is +50, min is -50)