A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Low cycle fatigue of SiCp reinforced AA2009 composites
Highlights SiCp/AA2009 composites consist of uniformly-dispersed SiCp in the matrix. The composite in T4 condition has a lower YS, higher ductility and equivalent UTS. The strain hardening exponent and hardening capacity in T4 condition are higher. Cyclic hardening is more pronounced in T4 condition than in T6 condition. SiCp particle cracking is a predominant failure mechanism during crack growth.
Abstract Strain-controlled low cycle fatigue (LCF) characteristics of an extruded Al–Cu–Mg aluminum alloy reinforced with SiC particles (SiCp/AA2009 composite) in the T4 and T6 heat treatment conditions were investigated. In comparison with the T6 condition with Al2CuMg precipitates, the composite in the T4 condition had a higher ductility and equivalent ultimate tensile strength despite a lower yield strength, leading to a higher strain hardening exponent and hardening capacity. Unlike the extruded magnesium alloys, the SiCp/AA2009 composite exhibited symmetrical hysteresis loops in tension and compression due to the dislocation slip-dominated deformation in the aluminum matrix. Cyclic hardening occurred at higher strain amplitudes with a more pronounced hardening in the T4 condition, and cyclic stabilization remained at lower strain amplitudes (0.1–0.3%). Fatigue life in both conditions was equivalent, which can be well described by the Coffin–Manson law and Basquin’s equation. Strain ratio significantly affected cyclic deformation characteristics of the composites in both conditions, with a large amount of plastic deformation observed in the tensile phase of the first cycle of hysteresis loops at zero or positive strain ratios. A mean stress relaxation was observed. Fatigue crack was observed to initiate from the specimen surface and crack propagation was characterized predominantly by particle cracking along with de-bonding.
Low cycle fatigue of SiCp reinforced AA2009 composites
Highlights SiCp/AA2009 composites consist of uniformly-dispersed SiCp in the matrix. The composite in T4 condition has a lower YS, higher ductility and equivalent UTS. The strain hardening exponent and hardening capacity in T4 condition are higher. Cyclic hardening is more pronounced in T4 condition than in T6 condition. SiCp particle cracking is a predominant failure mechanism during crack growth.
Abstract Strain-controlled low cycle fatigue (LCF) characteristics of an extruded Al–Cu–Mg aluminum alloy reinforced with SiC particles (SiCp/AA2009 composite) in the T4 and T6 heat treatment conditions were investigated. In comparison with the T6 condition with Al2CuMg precipitates, the composite in the T4 condition had a higher ductility and equivalent ultimate tensile strength despite a lower yield strength, leading to a higher strain hardening exponent and hardening capacity. Unlike the extruded magnesium alloys, the SiCp/AA2009 composite exhibited symmetrical hysteresis loops in tension and compression due to the dislocation slip-dominated deformation in the aluminum matrix. Cyclic hardening occurred at higher strain amplitudes with a more pronounced hardening in the T4 condition, and cyclic stabilization remained at lower strain amplitudes (0.1–0.3%). Fatigue life in both conditions was equivalent, which can be well described by the Coffin–Manson law and Basquin’s equation. Strain ratio significantly affected cyclic deformation characteristics of the composites in both conditions, with a large amount of plastic deformation observed in the tensile phase of the first cycle of hysteresis loops at zero or positive strain ratios. A mean stress relaxation was observed. Fatigue crack was observed to initiate from the specimen surface and crack propagation was characterized predominantly by particle cracking along with de-bonding.
Low cycle fatigue of SiCp reinforced AA2009 composites
Luk, M.J. (author) / Mirza, F.A. (author) / Chen, D.L. (author) / Ni, D.R. (author) / Xiao, B.L. (author) / Ma, Z.Y. (author)
2014-10-25
10 pages
Article (Journal)
Electronic Resource
English
Residual stresses and high cycle fatigue properties of friction stir welded SiCp/AA2009 composites
| British Library Online Contents | 2013
Residual stresses and high cycle fatigue properties of friction stir welded SiCp/AA2009 composites
| British Library Online Contents | 2013
| British Library Online Contents | 2006
Wear behaviour of SiCp-reinforced magnesium matrix composites
| British Library Online Contents | 2003