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FATIGUE LIFE ESTIMATION OF WELDED JOINTS OF AN ALUMINIUM ALLOY UNDER SUPERIMPOSED RANDOM LOAD WAVES: APPLICATION OF A 2‐DIMENSIONAL RAINFLOW METHOD
Author(s) -
Takahashi I.,
Maenaka H.,
Miyamoto T.
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb00783.x
Subject(s) - amplitude , welding , stress (linguistics) , aluminium , constant (computer programming) , aluminium alloy , structural engineering , diagram , materials science , cycle count , alloy , mathematics , acoustics , physics , engineering , statistics , composite material , optics , computer science , programming language , operations research , linguistics , philosophy
— Fatigue tests were carried out on welded T‐joints of JIS A5083P‐O Al‐Mg alloy under constant amplitude and superimposed random load waves. Each random wave was generated by superimposing a secondary zero‐mean random process on a constant amplitude pulsating trapezoidal wave, which simply simulated the GAG (ground‐air‐ground) stress cycles, or on a constant d.c. (direct current) component. It is proved that the 1‐dimensional rainflow method is insufficient as the mean stress effects are not considered. From a procedure using a 2‐dimensional rainflow method and the original and a modified Goodman diagram, it was concluded that the mean stress effects on secondary waves are larger in the case of GAG than d.c. Considering this, a life estimation procedure is proposed that gives consistent and acceptable estimation results.