RS Crack Closure: Experimental Observations and Modeling (from ERSI Workshop 2018)
Abstract: Analytical methods are needed to account for crack closure due to residual stress (RS) fields. Crack growth data from CX holes at multiple applied stress ratios developed by Analytical Processes/Engineered Solutions, Inc. (AP/ES) and Southwest Research Institute (SwRI) has shown a definite response to applied stress ratio with the data strongly suggesting that crack closure is an active mechanism. Closure is suspected to be one major contributor to discrepancies between predicted and observed crack growth behavior in the presence of RS fields. This presentation reports on the progress made by AP/ES and ESRD in the evaluation of the experimental data and the modeling of closure.
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“The p-type element has been used to great advantage in the finite element system ESRD StressCheck®, . This software provides the engineer with the means to conduct solution verification in an extremely straightforward manner by simply increasing the degree of the element, monitoring convergence and using Richardson extrapolation reliably to estimate the error. This can be conducted automatically by the software thereby enabling the engineer to concentrate on the engineering rather than the simulation. StressCheck® has also been used to develop ESRD’s Handbook and Toolbox applications. The first of these provides engineers with a repository of parameterised standard problems of the type found in texts like Roark’s “Formulas for Stress and Strain”, . The second, Toolbox, is a tool that can be used to parameterise a company’s range of components for rapid and reliable analysis by non-expert analysis. Toolbox then is an exemplary of the way in which the democratisation of simulation can be applied.”
Angus Ramsay, PhDEngineering Director, Ramsay Maunder Associates