Contact stress distributions in a turbine disc dovetail type joint - a comparison of photoelastic and finite element results |
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Authors: | B Kenny E A Patterson M Said K S S Aradhya |
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Affiliation: | Dept of Mechanical and Process Engineering, University of Sheffield. MaDDin Street. Sheffield S1 3JD. |
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Abstract: | Two dimensional photoelastic frozen stress techniques were used to investigate the stress distributions of an axially loaded dovetail joint as is found in the design of some turbine blade-disc fixings. The internal stress distributions were obtained by the shear difference method and were compared to results obtained by using the finite element method. It was found that steep principal stress gradients were present immediately below the contact surfaces in the zone adjacent to the fillet radius of the dovetail fixing, which could be an important consideration in the fatigue strength of the joint. The finite element model used gave the same trends of stress as the photoelastic model, predicted higher peak principal stresses and did not exhibit the same detailed variations of stress distribution. |
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Keywords: | Photoelasticity finite element analysis turbines dovetail joints |
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