Realism in Fatigue Testing: The Effect of Flight-by-Flight Thermal and Random Load Histories on Composite Bonded Joints

2009 ◽  
pp. 307-307-16 ◽  
Author(s):  
DJ Wilkins ◽  
RV Wolff ◽  
M Shinozuka ◽  
EF Cox
Keyword(s):  
Fatigue Testing ◽  
Bonded Joints ◽  
Random Load

Finite Fatigue Life Distributions of SAE 1008 Subjected to Various Load-Time Histories

1980 ◽  
Vol 102 (1) ◽  
pp. 135-140 ◽  
Author(s):  
H. A. ElMaraghy ◽  
J. N. Siddall
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Narrow Band ◽  
Fatigue Properties ◽  
Load History ◽  
Random Load ◽  
Bending Fatigue ◽  
Theoretical Predictions ◽  
Time Histories ◽  
Life Distributions

The probabilistic fatigue properties of SAE 1008 steel were determined experimentally. A flexural bending fatigue testing program was carried out consisting of: (a) constant strain amplitude, (b) blocks of Hi-Lo and Lo-Hi-Lo strain amplitudes, and (c) narrow band random load history. Fatigue life of 30-45 specimens in each program were recorded and used to construct distributions of fatigue life. A computer simulation technique was used to predict these distributions. Experimental results and theoretical predictions are both presented for comparison.

scholarly journals Development and evaluation of high-speed random load fatigue testing system.

1987 ◽  
Vol 36 (409) ◽  
pp. 1139-1144
Author(s):  
Masatoshi NIHEI ◽  
Satoshi NISHIJIMA ◽  
Takeshi KONNO ◽  
Tomoo SHIMONAKA ◽  
Yoshiaki HAYASHI ◽  
...  
Keyword(s):  
High Speed ◽  
Fatigue Testing ◽  
Testing System ◽  
Random Load

Bending fatigue testing of gear teeth under random loading

2001 ◽  
Vol 215 (7) ◽  
pp. 773-784 ◽  
Author(s):  
D Hanumanna ◽  
S Narayanan ◽  
S Krishnamurthy
Keyword(s):  
Fatigue Life ◽  
Power Transmission ◽  
Fatigue Testing ◽  
Cumulative Damage ◽  
Loading Conditions ◽  
Test Rig ◽  
Random Loading ◽  
Random Load ◽  
Bending Fatigue ◽  
Modes Of Failure

The gears in a gear box fitted in an armoured tracked vehicle for the purpose of power transmission and positioning of rotating heavy mass to the desired angle with high accuracy are subjected to fluctuating loads that are random in nature. One of the important modes of failure in cyclic loading conditions including random loads is fatigue failure. It is thus important from the design point of view to estimate the life of the gears under these conditions. The fatigue life of components subjected to sinusoidal loading can be estimated by using cumulative damage theories. Their extension to random load fatigue, though straightforward, may not be very accurate owing to inherent scatter exhibited by the fatigue phenomenon. It is therefore necessary experimentally to determine the fatigue life of randomly loaded components and establish the validity of the theoretical model. An electrohydraulic test rig has been designed and fabricated that is capable of generating different types of load pattern by adopting a suitable electronic circuit in the test rig. This paper presents the details of the test rig for random load generation, the test fixture for mounting the gear and the technique for testing the gear for bending fatigue life under random loading. A gear has been tested in the test rig under random loading conditions and also under constant amplitude conditions for bending fatigue, and the life of the gear has been obtained experimentally. Fatigue lives of the gear have also been estimated theoretically by employing linear cumulative damage theory using the peak count method.

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