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OPEN
A CHECK OF CRACK PROPAGATION MODELS
AGAINST TEST RESULTS
GENERATED UNDER TRANSPORT AND MILITARY
AIRCRAFT FLIGHT SIMULATION LOADING
(GARTEUR TP 54)
Produced by
GARTEUR ACTION GROUP SM (AG)04
OPEN
SUMMARY
The Group of R e s p n a l e s fo r Structures and Materials identified the need for an evaluation of fatigue crack propgation mdels. This resulted i n a f i r s t collaborative GARTEUR act ivi ty (frun 1979 to 1983)
cccrrp?leted by a follcwon programre carried out frun 1983 to 1987. This
report presents this follcw-on GARTEUR act ivi ty i n which 7 ins t i tu tes and
companies perfomel nummus fatigue crack gmwth t e s t l i f e evaluations using i n total 10 prediction mthods and d e l s . Ttm types of spectrum
loading were consider& : the F-27 transprt spectrum am3 the FALSWW
mi l i t a ry spectrum. A s e t of 89 prediction cases was established allawing for the investigation of spectrum variations, mterials and thicknesses.
sons between predicted and test l ives are presented and analysed. It
is sham tha t a e l s including load interaction effect based on the crack
closure mncept axe l ikely to provide the most accurate predictions. The
collaborative w r k finished with an extra "blirxl predictionsn wrcice similar to the previous wrk accept t h a t the 9 results of tests under A320
spectrum loadings were kept unlrnm before the i r preihctions,
c 3 m z U R ~ f i 4
Prepxed under the auspices of the Responsables fo r
Structwes am3 Materials of the Group f o r Aeronautical
Research. and Technology i n Ewope (CXEBJR)
Page
1 . In-ction. ............................................. ...................... 2 .- ~~ description and milestones
21 - Ptmgmme description ............................... 22 - Mlestones .......................................... 23 - P m c i pants ........................................
3 - AG4 Chck growth database description ..................... 3 1 - F-27 database. ......................................
311 - Description of the F-27 spectrurn and its variations ......... 312 - Fatigue crack propagation test results
.................. 3121 - Constant amplitude tests ................ 3122 - F-27 spectrum test results
32 - FATSEWF database .................................... 321 - Definition of FATSWT spectra ................. 322 - Fatigue crack propagation test results .........
3221 - Constant amplitude tests .................. 3222 - F m spectnnn test results ............
4 - Prediction : Short description of the partxcipant methods and r e d ts ......................................................
41 - Rules for the adjustment of the prediction models .... 42 - BAe wedimom ....................................... 43 - DFVtR predictions ..................................... 44 - IABG predictions ......................................
441 - Linear mode1 (Elber type) ....................... 442 -Wheeler mode1 ................................... 443 - Wille&q -el ................................ 444 - re^^.............................. ...........
....................................... 45 - MEB m c t i o m 451 - Linear awry ................................... 452 - Non linear theory ............................... 453 - Results .........................................
46 - predictions ....................................... ..................................... 47 - aw?A practiom
48 - AMD-HA predictions .................................... ........................ 49 - m t s on prediction re suLts
5 -. Caparison between predictions and test results .............. 6 - Evaluation of the capabilities of the mthods and rabdels f o r
predicting fatigue crack grawth .............................. 61 - The AMD-BA mad ...................................... 62 - The BAE! method..........,.........,..^..................
........................................ 63 - The DFVLR &el
64 - The IABG m e w ....................................... ........................................ 65 - The BE33 m M
66 - The NLR model * m S w ................................. 67 - The CWR& d e 1 ........................................
7 - The "blind predictions" wrcice .............................. 71 - A320 datdbase ..........................................
711 - A320 s p e c ~ a ..................................... 712 - Constant amplitude mterial data ................. 713 - Under spectrum test results ......................
72 - Prediction resu l t s ..................................... 73 - &agarison of predictions to tests .....................
8 - Dismssion ................................................... 9 - Conclusion ................................................... 10 - Acknwld-t .............................................. 11 - Distrifxttion list ...........................................
.................................................. 12 - Wferences