Acoustic emission from fiber reinforced plastic damaged hoop wrapped cylinders

metal lined continuous fiber reinforced plastic (FRP) hoop wrapped cylinder s with axial cuts to the FRP were modeled mathematically and tested experim entally. Steel lined and aluminum alloy lined glass FRP vessels were subjec ted to acoustic emission tests (AE) and hydraulic burst tests. The burst pr essure decreased monotonically with the length of the axial cut. Acoustic e mission increased initially with a decrease in burst pressure, and attained a maximum at an intermediate level of damage to the FRP. However, acoustic emission decreased when the level of damage was higher and the burst press ure was lower. Implications of the findings are discussed in the context of the search for an acoustic emission test method to inspect periodically th e vessels used for the storage of compressed gaseous fuels on natural gas v ehicles (NGV) and hydrogen vehicles.