|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Factors Controlling Fatigue Crack Initiation at Particles in High Strength Al Alloys
||Xinliang Zang, Wei Wen, Alfonso H.W. Ngan, Tongguang Zhai
|On-Site Speaker (Planned)
The geometry, size, clustering and orientation of the particles in the surface region of high strength Al alloys were investigated using a finite element analysis method, assuming the alloys were linear elastic-plastic continuum homogeneous. It was found that the thickness, position in depth, orientation and clustering of particles had significant effects on the stress and strain concentration around the particles in the surface region. The fatigue weak-links were measured on planes parallel to the rolling plane and the cross-section plane, respective, in an AA2024 Al alloy, indicating that weak-links were much less on the cross-section plane than the rolling plane. The 3-D geometry of the particles initiating cracks were also studied using a focus ion beam. The results supported the finite element analysis results.
||Definite: A CD-only volume