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Full-Text Articles in Mechanical Engineering
A Hybrid Bishop-Hill Model For Microstructure Sensitive Design, Ribeka Takahashi
A Hybrid Bishop-Hill Model For Microstructure Sensitive Design, Ribeka Takahashi
Theses and Dissertations
A method is presented for adapting the classical Bishop-Hill model to the requirements of elastic/yield-limited design in metals of arbitrary crystallographic texture. The proposed Hybrid Bishop-Hill (HBH) model, which will be applied to ductile FCC metals, retains the `stress corners' of the polyhedral Bishop-Hill yield surface. However, it replaces the `maximum work criterion' with a criterion that minimizes the Euclidean distance between the applicable local corner stress state and the macroscopic stress state. This compromise leads to a model that is much more accessible to yield-limited design problems. Demonstration of performance for the HBH model is presented for an extensive …
Study On The Fracture Toughness Of Friction Stir Welded Api X80, Allan M. Tribe
Study On The Fracture Toughness Of Friction Stir Welded Api X80, Allan M. Tribe
Theses and Dissertations
High strength low alloy (HSLA) steels have been developed to simultaneously have high yield strength and high fracture toughness. However, in practical applications steel must be welded. Traditional arc welding has proven detrimental to the fracture toughness of HSLA steels. Friction stir welding has recently shown mixed results in welding HSLA steels. The range of welding parameters used in these recent studies however has been very limited. With only a few welding parameters tested, the effect of spindle speed, travel speed, and heat input on the fracture toughness of friction stir welded HSLA steel remains unknown. To understand how the …