Ductile fatigue crack

Greater amounts of copper increase the proportion of needles or stars of Cu Sn in the microstructure. Increase in antimony above 7.5% results in antimony—tin cubes. Hardness and tensile strength increase with copper and antimony content ductility decreases. Low percentages of antimony (3—7%) and copper (2—4%) provide maximum resistance to fatigue cracking in service. Since these low alloy compositions are relatively soft and weak, compromise between fatigue resistance and compressive strength is often necessary. 

S. Groh et al Fatigue crack growth from a cracked elastic particle into a ductile matrix. Phil. Mag. 88, 3565-3583 (2008)... 

In general, introduction of crosslinking reduces chain mobility, decreases ductility and toughness, and increases the rate of fatigue crack propagation. However,... 

This paper addresses three topics of current scientific and technological interest poly(vinyl chloride) (PVC) toughening of brittle or ductile but notch-sensitive polymers by the inclusion of rubbery phases and the kinetics of fatigue crack propagation (FCP). 

Ritchie, R.O. (1999) Mechanisms of fatigue-crack propagation in ductile and brittle solids, hit. J. Fract., 100, 55—83. 

The manifestation of hydrogen embrittlement in structural metals is enhanced susceptibility to fracture. Hydrogen reduces typical measures of fracture resistance such as tensile strength, ductility, and fracture toughness, accelerates fatigue crack propagation, and introduces additional material failure modes... 

AKtb fatigue-crack-growth threshold ductile materials... 

Venkateswara Rao K.T., Soboyejo, W.O., Ritchie, R.O., 1992, Ductile phase toughening and fatigue crack growth in Nb reinforced molybdenum disilicide intermetallic composites. Metallurgical Trans actions A 23A 2249. 

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