|Title:||Stress and Deflection Analysis of Cracked Composite Pressure Vessel by Finite Element Method|
|???metadata.dc.contributor.*???:||Daniel Tilahun (PhD)|
|Keywords:||Stress;Pressure Vessel;Deflection;Cracked Composite|
|Abstract:||The aim of this thesis is to develop crack and investigate techniques and parameters that could be used to identify crack if it exist in a composite pressure vessel. Many researchers discovered formation or propagation of a crack in a composite pressure vessel will cause a catastrophic failure. Thus, health monitoring for a pressure vessel due to crack using crack detection techniques will minimize or reduce the failure that probably to occur. This research first focused on mathematical and numerical relation which, represent the governing equation of composite material winding on in a pressure vessel. For modeling different crack size in the composite overwrapped pressure vessel fracture stress theories applied. Different surface Crack size are considering according to the literature standard values. Model actual size of composite pressure vessel with varied crack size “a” develops on the surface of composite pressure vessel. This research thoroughly analysis the effect of crack on the surface of composite pressure vessel. Those parameters are considered to see the variation of result due to presence of crack. The main parameters are considering stress, principal stress, von mises stress, deflection and fracture stress. According to the parameters it shows that as crack size increase, the average stress will be increase with the given pressure in composite pressure vessel. In contradict; the fracture stress will be decrease as the crack size increase. In this study, optimal angle-ply orientations of symmetric [550, -550] shells designed for maximum burst pressure with allowable crack size were investigated. It is shown that all the strength characteristics of carbon fiber relevant to structural engineering can be explained by the cracks present in the carbon fiber and can be analyzed using fracture mechanics. The stress and deformation are affected due to the presence of crack in composite pressure vessel. These parameter are takes a design crack as the basis for design. Rather than an allowable stress as in current approaches, with which it is compared cracked composite pressure vessel. A full size cylindrical shell of composite pressure vessels is conducted. A mathematical method, A finite element method and compare experimental test are studied to verify a maximum allowable crack size in composite overwrapped pressure vessel with a given optimum winding angles. The roll of crack size design within the wider philosophy of limit state design is discussed.|
|Appears in Collections:||Applied Mechanics|
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