Effect of Temperature on Creep Crack Growth

1980 ◽  
Vol 102 (4) ◽  
pp. 350-355 ◽  
Author(s):  
V. M. Radhakrishnan ◽  
A. J. McEvily
Keyword(s):  
Crack Growth ◽  
Growth Process ◽  
Creep Crack Growth ◽  
Creep Condition ◽  
Effect Of Temperature ◽  
Al Alloy ◽  
Kcal Mole ◽  
6061 Al Alloy ◽  
Parameter Approach ◽  
Deflection Rate

Investigations have been carried out to study the effect of temperature on crack growth under creep condition in 6061 Al alloy. A parameter approach, connecting the three variables - crack growth rate a˙, the load point deflection rate Δ˙ and the applied load P - given in the form a˙∝Δ/˙PPoα1/θ where α, θ, and Po are constants, has been found to give good correlation with the experimental data. The exponents, α and θ, are dependent on temperature. The activation energy for the crack growth process has been found to be around 24 Kcal/mole.

A Critical Analysis of Crack Growth in Creep

1980 ◽  
Vol 102 (2) ◽  
pp. 200-206 ◽  
Author(s):  
V. M. Radhakrishnan ◽  
A. J. McEvily
Keyword(s):  
Crack Growth ◽  
Growth Behavior ◽  
Experimental Investigations ◽  
Critical Examination ◽  
Crack Growth Behavior ◽  
Al Alloy ◽  
Reference Stress ◽  
Stress Energy ◽  
Crack Zone ◽  
6061 Al Alloy

Experimental investigations have been carried out to study the crack growth behavior in creep in a 6061 Al alloy. The crack growth rate is analyzed by the stress intensity factor, reference stress, energy rate line integral C* and modified J integral method and a critical examination is made of the applicability of different procedures. Based on the experimental observations near the crack zone, a new parameter in the form [Δ˙ / (P/P0)α], where Δ˙ is the deflection rate, P the applied load and the exponent α and P0 are constants, is proposed to describe the crack growth behavior in ductile materials.

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