SEDL / STP / STP1080-EB / STP25402S

Fatigue Crack Growth in an Al²O³ Short Fiber Reinforced Al-2Mg Alloy

Preston, S
Specialist and head, Swedish Institute for Metals Research, Stockholm,

Melander, A
Specialist and head, Swedish Institute for Metals Research, Stockholm,

Groth, HL
Senior research engineer and professor, The Royal Institute of Technology, Stockholm,

Blom, AF
Senior research engineer and professor, The Royal Institute of Technology, Stockholm,

Pages: 14    Published: Jan 1990

Download this paper for $25 PDF (476K)          View License Agreement
Abstract

Metal matrix composites (Al-2Mg) reinforced with 10% by volume “Saffil” fibers were manufactured by a pressure infiltration technique. The initiation and growth of fatigue cracks in these composites were investigated by two methods.

Fatigue crack initiation and early crack growth were studied in smooth four-point bend specimens using replication techniques. The mechanisms of crack initiation were interpreted in terms of fiber interactions.

Fatigue crack growth behavior for long cracks was studied on CT-specimens. The long crack growth data for stress ratios R = 0. 05 and 0. 5 were correlated by incorporating measured values of crack closure into an effective driving force, ΔK^eff.