A New Engineering Theory of Planar Bending and Applications.
Abstract
A new engineering bending theory is presented. Predictions of static bending response using this theory agree exactly with elasticity solutions for several uniformly distributed loading cases. The contributions due to various physical effects are found to be more pronounced for orthotropic materials with low shear and transverse extensional modli. Such properties are typical of advanced composite materials used in the aerospace industry. The theory is extended to study the dynamic behavior of beams and static buckling of columns. Validation for the theory is provided by analysis of classical benchmark problems - - - a simply supported beam under sinusoidally distributed loading and flexural wave propagation in rectangular slabs. Numerous applications are presented. Effects of property degradation due to hygrothermal conditioning on the behavior of several elementary unidirectional composite structures are studied. The hygrothermal condition used to simulate long term aircraft service does not pose a serious problem. The loss of performance is approximately ten percent. However, complete moisture saturation produces significant effects. Reductions in the performance up to 35 percent can be expected, thus indicating that this condition should be avoided.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1982
- Accession Number
- ADA121461
Entities
People
- Lawrence W. Rehfield
- Pappu L. N. Murthy
Organizations
- Georgia Tech