Debonding Stress Concentrations in a Pressurized Lobed Sandwich-Walled Generic Cryogenic Tank

By National Aeronautics and Space Administration

A finite-element stress analysis has been conducted on a lobed composite sandwich tank subjected to internal pressure and cryogenic cooling. The lobed geometry consists of two obtuse circular walls joined together with a common flat wall. Under internal pressure and cryogenic cooling, this type of lobed tank wall will experience open-mode (a process in which the honeycomb is stretched in the depth direction) and shear stress concentrations at the junctures where curved wall changes into flat wall (known as a curve-flat juncture). Open-mode and shear stress concentrations occur in the honeycomb core at the curve-flat junctures and could cause debonding failure. The levels of contributions from internal pressure and temperature loading to the open-mode and shear debonding failure are compared. The lobed fuel tank with honeycomb sandwich walls has been found to be a structurally unsound geometry because of very low debonding failure strengths. The debonding failure problem could be eliminated if the honeycomb core at the curve-flat juncture is replaced with a solid core.Ko, William L.Armstrong Flight Research CenterCRYOGENIC COOLING; DEBONDING (MATERIALS); FUEL TANKS; HONEYCOMB STRUCTURES; SANDWICH STRUCTURES; STRESS CONCENTRATION; PRESSURIZING; WALLS; FINITE ELEMENT METHOD; INTERNAL PRESSURE; SHEAR STRESS; FAILURE ANALYSIS; DEFORMATION; LOADS (FORCES); TANGENTIAL BLOWING

• Format: Paperback
• Language: English
• ISBN: 1723717908
• ISBN13: 9781723717901
• Release Date: January 1
• Publisher: Independently Published
• Length: 36 Pages
• Weight: 0.24 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"