The Effect of Thickness Variations on the Behavior of Smooth Curved Pipes Under External Bending

Autor:	G. E. Findlay, J. Spence
Rok vydání:	1980
Předmět:	Materials science Mechanics of Materials business.industry Mechanical Engineering Physics::Accelerator Physics Displacement (orthopedic surgery) Bending Structural engineering Composite material Plasticity Safety Risk Reliability and Quality business
Zdroj:	Journal of Pressure Vessel Technology. 102:45-48
ISSN:	1528-8978 0094-9930
DOI:	10.1115/1.3263300
Popis:	By various manufacturing techniques straight pipes with initially circular cross sections can be processed into smooth bends but usually with noncircular cross sections and with variations in thickness. These changes from the ideal are normally referred to as “ovality” and “thinning”; their influence on the subsequent behaviour of curved pipes is not yet fully understood. Here theoretical work on constant thickness circular and elliptical cross sections has been extended to cope with typical variations in thickness. The theory which is based on a classical energy approach is outlined for in-plane bending loading and is easily extended to cover out-of-plane bending. Linear elastic small displacement limitations apply. It is concluded that normally accepted values of thinning have virtually no effect on the flexibility due to bending of smooth pipe bends with or without initial ovality. Similarly, the peak meridional bending stresses were found to be insensitive to thickness variations.
Databáze:	OpenAIRE
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