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Title: Creep and creep fracture of alpha/beta brass
Author: Jones, J. P.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 1998
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The uniaxial creep and creep fracture properties of α/β brass in air, have been determined over the stress range 9MPa - 185MPa at 523-673 K, using high precision constant stress creep testing machines. In the majority of cases, normal creep curves were recorded however, under certain conditions, due to the interactions of the two constituent phases some curves exhibited two areas of primary creep. Traditional Power Law analysis was carried out, and was found to be in agreement with published data. An alternative approach, known as the θ Projection Concept accurately described the accumulation of strain with time. Creep fracture was found to occur as a result of the accumulation of damage, primarily at α-β interfaces. To investigate the effect of varying stress states, biaxial creep testing was carried out at an effective stress of 140MPa at 523K. Using uniaxial and multiaxial test data, the θ Projection Concept was further developed to critically evaluate the damage processes occurring and their dependence on stress state. It was found that a damage at failure parameter, ω, decreased with increasing maximum principal stress.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available