SEDL / STP / STP1074-EB / STP19013S

Method and Models for R-Curve Instability Calculations

Orange, TW
Research Engineer, NASA Lewis Research Center, Cleveland, OH

Pages: 15    Published: Jan 1990

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Abstract

This paper presents a simple method for performing elastic R-curve instability calculations. For a single material-structure combination, the calculations can be done on some pocket calculators. On microcomputers and larger, it enables the development of a comprehensive program having libraries of driving-force equations for different configurations and R-curve model equations for different materials. The paper also presents several model equations for fitting to experimental R-curve data, both linear elastic and elasto-plastic. The models are fit to data from the literature to demonstrate their viability.