Masood Shah
,
Catherine Mabru
,
Farhad Rezai-Aria
,
Ines Souki
,
Riffat Asim Pasha
金属学报(英文版)
A finite element analysis of stress intensity factors (K I) in clamped SE(T) C specimens (dog bone profile) is presented. A J-integral approach is used to calculate the values of stress intensity factors valid for 0.125 ≤a/W≤0.625. A detailed comparison is made with the work of other researchers on rectangular specimens. Different boundary conditions are explored to best describe the real conditions in the laboratory. A sensitivity study is also presented to explore the effects of variation in specimen position in the grips of the testing machine. Finally the numerically calculated SIF is used to determine an FCGR curve for AISI H11 tool steel on SE(T) C specimens and compared with C(T) specimen of the same material.
关键词:
Fatigue crack propagation
,
null
,
null
,
null
Zhenzhong CHEN
,
Ping HE
材料科学技术（英文）
Fatigue crack propagation (FCP) behaviors were studied to understand the role of SiC particles in 10 wt pct SiCp/A2024 composites and Si particles in casting aluminum alloy A356. The results show that a few particles appeared on the fracture surfaces in SiCp/Al composites even at high △K region, which indicates that cracks propagated predominantly within the matrix avoiding SiC particles due to the high strength of the particles and the strong particle/matrix interface. In casting aluminum alloy, Si particle debonding was more prominent. Compared with SiCp/Al composite, the casting aluminum alloy exhibited lower FCP rates, but had a slight steeper slope in the Paris region. Crack deflection and branching were found to be more remarkable in the casting aluminum alloy than that in the SiCp/Al composites, which may be contributed to higher FCP resistance in casting aluminum alloy.
关键词:
Aluminum-matrix composites
,
composites
,
casting
,
alloy
