2 lecture 4 - Failure Predictors and Safety Factors - slide

Biaxial stress 1 2 question when will it fail my

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Unformatted text preview: tal stress-strain curves Mechanical Design Prediction of failure by yielding Case study #2 – shaft (torque with bending) A shaft is a rotating element that transmits torque. biaxial stress: (σ1, σ2) Question: When will it fail? σ = My / I τ = Tr / J P Mechanical Design Prediction of failure by yielding Case study #2 – shaft (torque with bending) A shaft is a rotating element that transmits torque. Example: Grinding process Mechanical Design Prediction of failure by yielding Case study #3 – pressure vessel A vessel is an element that contains fluid pressure. triaxial stress: (σ1, σ2, σ3) Question: When will it fail? σ1 = σH = pD / 2t σ2 = σA = pD / 4t σ3 = σR = -p / 2 Mechanical Design Difficulty: The designer faces a difficulty in getting from here … to here … material laboratory real world Mechanical Design Difficulty: The designer faces a difficulty in getting from here … to here … Question: How do we predict failure when more than one principal stress is present? Answer: Use a Failure Predictor materi...
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This note was uploaded on 04/09/2012 for the course MECHANICAL 101 taught by Professor Kent during the Three '11 term at University of Melbourne.

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