Reduced variation in design and analysis of lightweight welded structure
نویسنده
چکیده
The subject of this master thesis is about reduced variation in design and analysis of lightweight welded structures. The project is a collaboration with Volvo, Bromma and KTH. With technology development, lightweight structures are become more and more popular. In manufacturing factories, improving fatigue life in lightweight welded structures is necessary and essential. This thesis is about reduced variation in design and analysis of lightweight welded structures. Different method that are linear elastic fracture mechanics, effective notch stress and nominal stress are implemented to analysis of load carrying and non-load carrying cases. Meanwhile, various codes IIW, Euro code 3 and Crane standard are compared. For IIW, all three methods are included. However, only nominal stress method is used for Euro code 3 and Crane standard. In simple loading and non-load carrying geometrical models, changing plate thickness and penetration will result in different effect on fatigue life. The latter part of thesis is focused in the evaluation of Volvo standards. Effective notch stress method is applied to obtain stress values and then calculate fatigue life. Several types of imperfection cases are analyzed for both load carrying and non-load carrying cases. All fatigue life values are compared to the reference fatigue life value which is 2 million cycles so that all statistics are presented in clear percentages. The study shows that varied plate thickness and penetration will influence fatigue life. Various methods and codes will affect fatigue life diversely in load carrying and non-load carrying cases. The variation of weld defects in Volvo standard cases also have different impact on load carrying and non-load carrying cases.
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