The main objective in present thesis is to gain a method to simulate and analyze of “Spring-back” matter in creep forming of titanium sheets, using ABAQUS software. This contains the main titles of what is done to achieve this goal and the results as well. In first chapter, common information about various forming methods and their characteristics are given, and then creep forming and spring-back phenomenon are introduced. By comparing the usual specifications of creep forming with other common forming processes, the importance and efficiency of creep forming becomes obvious. In following, a brief summery of practical and theoretical done projects about creep forming and spring-back are considered and at end, some industrial applications, especially in aerospace, are introduced. In second chapter, experiments for studding material behavior related to time and their diagrams are considered and the standard creep diagram is studied. In following, governing equations over creep behavior of material are introduced and the homogenized creep equations for a plate under pure bending have been derived. In third chapter, ABAQUS capabilities and tools for simulating a creep behavior of materials are discussed. Various creep models in software library are introduced and each characteristic is studied. Following that, Integration methods which analyze creep behavior are considered and valid limits for each are studied. At end, various analyzing methods are discussed. In fourth chapter, the used procedure for simulating creep forming and spring-back matter in ABAQUS software is completely explained and problems due to each simulation step are fully discussed. In fifth chapter, firstly, the results gained from simulation described in previous chapter, are explained and regarding to diagrams gained from results, the effect of each influencive parameter in spring-back behavior is demonstrated. Regarding to effective parameters, three major parameters are studied. These parameters are initial forming process duration time, creep duration time and work-piece thickness. According to results and diagrams gained from simulation and analysis, it is demonstrated that the amount of spring-back of work-piece is independent to initial forming duration time, but due to straight relation between the amount of revealing stress and creep duration time and wok-piece thickness, the amount of spring-back directly depends on these two parameters. Following that, by comparing the simulation results with done projects, the result verification is well approved and a summarized finalization about creep behavior and characteristics is performed at the end. Finally, some suggestions for continuing the project and its development are made.
