SRIM Composite Fatigue Test Data Created by F.D.+E Comm.

SRIM, glass-fiber reinforced, Room Temp. :
• SRIM Strain Life test data
  NOTE: The file cannot be easily "fitted" using the ASTM E606
  (Coffin-Manson) approach because of the negative values for plastic strain
  amplitude; which arise from the variablity of the test specimen moduli and
  the small observable amounts of plastic strain in the stress-strain hysteresis loops.

• SRIM Cyclic Stress-Strain Curve : A digital fit of the data (see also Ref.[2]).
  Created by constructing a median cyclic stress-strain curve.

• SRIM Neuber Stress Plot for strain controlled test results and Equivalent
  Stress for load controlled test results for axial un-notched specimens
  versus Cycles to Failure.
  The the median and upper and lower data boundary lines (red) on the plot
  were used to compute the life values for each of the points on the
  Median cyclic stress-strain curve. The result are the three "Fitted" and
  "Calculator" variations below.

SRIM Fitted Curves and Calculators:

• High: __ | __ Fitted Curve __ | __ SRIM life Calculator
  
• Median: __ | __ Fitted Curve __ | __ SRIM life Calculator
  
• Low: __ | __ Fitted Curve __ | __ SRIM life Calculator

Background:

Details of this fitting process can be found in the article:
"A Methodology for Fitting Fatigue Life Calculation Curves to SRIM Composite Data"


References:

1. http://www.fatigue.org/data.html
   (click on "Composite") A summary report on the SRIM Fatigue Test Results,
   presented by P.Kurath to the F.D.+E. Comm.
2. F.A.Conle and J.D.Rehkopf, "Analysis of the Results of Strain Controlled
   Fatigue Testing of Reinforced Polypropylene", SAE Paper No. 2009-01-0258

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