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07488 Effects dK/da on SCC Growth Rate

Picture for 07488 Effects dK/da on SCC Growth Rate
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Product Number: 51300-07488-SG
ISBN: 07488 2007 CP
Author: Peter L. Andresen and Martin M. Morra
Publication Date: 2007
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$20.00
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All plant components and most laboratory specimens exhibit changes in stress intensity factor (K) as the crack depth (a) increases from small dimensions. In most laboratory specimens, dWda is a small, positive number. In many plant components, dWda is larger and in some cases becomes negative if K peaks and then decreases. Above certain +dK/da values, the crack growth rate can rise dramatically (>100X in some cases). There appears to be a threshold dWdt, which is a product of dWdax daldt (the growth rate). Thus, for materials and conditions that yield higher growth rates, a lower +dWda value will produce an acceleration in growth rate.
All plant components and most laboratory specimens exhibit changes in stress intensity factor (K) as the crack depth (a) increases from small dimensions. In most laboratory specimens, dWda is a small, positive number. In many plant components, dWda is larger and in some cases becomes negative if K peaks and then decreases. Above certain +dK/da values, the crack growth rate can rise dramatically (>100X in some cases). There appears to be a threshold dWdt, which is a product of dWdax daldt (the growth rate). Thus, for materials and conditions that yield higher growth rates, a lower +dWda value will produce an acceleration in growth rate.
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