| Summary: | 碩士 === 國立屏東科技大學 === 車輛工程系所 === 106 === Pre-stressed structures have been adopted for mechanical industry such as high pressure vessel and high loading frame. The advantage of pre-stressed structure design is to apply pre-stress to the structure in order to increase its load capacity. In general, the pre-stress can be generated by using wire winding. The high strength steel wire is generally used for the winding process. Key parameters, including the variation of pre-load, numbers of wire winding, structural deformation and stresses, should be estimated and analyzed in the design process. The objective of this research is to obtain the key parameters of prestressed structures by using finite element method. Theoretical calculation is first performed to obtain those key parameters based on equivalent shear stress method for pressure vessel winding, and based A-type variable method for frame winding. Finite element model is then established using the thermal deformation method. A temperature drop is assumed to generate pre-tension of the steel wire and therefore the pre-stress is generated to the pressure vessel and frame. A commercial code LS-DYNA is used to simulate the stress and strain of pre-stressed pressure vessel, frame and steel wires. The deformations generated by pre-stress at the inner diameter of pressure vessel and frame are measured eventually. The test data are used to validate the simulation results. Good agreements are obtained.
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