Paper Title:
Effect of Humidity on Fatigue Strength of Age-Hardened Al Alloy under Rotating Bending
  Abstract

In order to investigate the effect of humidity on fatigue strength of an extruded and age-hardened Al alloy 7075-T6, rotating bending fatigue tests were carried out using plain specimens in environments of controlled relative humidity of 25%, 50%, 75% and 85% and distilled water. The cross section of the alloy has a marked texture of (111) plane. Although fatigue strength was decreased by high humidity, the decrease by high humidity was very small when the humidity was lower than about 60% -70% and fatigue strength was largely decreased over the humidity. Both of initiation and propagation of a crack were accelerated by high humidity. In high humidity, a crack propagated in a shear mode macroscopically and it was ductile in company with many glide planes and voids microscopically. That is, the propagation was not a tensile mode with brittle facets even in water. The shear mode propagation inclined about 35° to the extruded direction and fracture surface was (100) plane, meaning that the shear mode propagation of a crack was mainly caused by the marked texture of the alloy. The propagation mode of a crack was affected by not only environment but also stress level.

  Info
Periodical
Key Engineering Materials (Volumes 452-453)
Edited by
A. Saimoto and M.H. Aliabadi
Pages
745-748
DOI
10.4028/www.scientific.net/KEM.452-453.745
Citation
N. Kawagoishi, K. Kariya, Y. Nu, S. Furumoto, E. Kondo, "Effect of Humidity on Fatigue Strength of Age-Hardened Al Alloy under Rotating Bending", Key Engineering Materials, Vols. 452-453, pp. 745-748, 2011
Online since
November 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tomáš Denk, Vladislav Oliva, Aleš Materna
Abstract:A two-parameter constraint-based fracture mechanics approach is used to explain the effect of the constraint on the apparently anomalous...
307
Authors: Young Pyo Kim, Cheol Man Kim, Woo Sik Kim, Kwang Seon Shin
Abstract:A clear understanding of fatigue properties for the pipeline steel and its weld is important to provide information for pipeline design...
303
Authors: Won Beom Kim, Jeom Kee Paik
Abstract:In this research, corrosion fatigue tests using tensile strength of 490MPa TMCP steel were performed in synthetic seawater condition to...
1145
Authors: M.R.M. Aliha, Mahdi Rezaei
Abstract:Crack growth path was investigated experimentally, numerically and theoretically using two test specimens subjected to pure mode II loading....
159