2 lecture 4 - Failure Predictors and Safety Factors - slide

E the components ability to resist a given type of

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Unformatted text preview: matic estimation of uncertainty Formally, Fd is the ratio of: The “strength” of a component, S (i.e. the component’s ability to resist a given type of failure, usually measured in terms of the load that would cause the failure) The highest “stress” from worst-case loading of the component Mechanical Design Factors of Safety Evaluation of Fd can be: “implicit” – based on experience, sometimes dictated by standards “explicit” – determined by a systematic estimation of uncertainty Formally, Fd is the ratio of: The “strength” of a component, S (i.e. the component’s ability to resist a given type of failure, usually measured in terms of the load that would cause the failure) S Fd ≥rom worst-case loading of the The highest “stress” f "σ " component Mechanical Design Factors of Safety S Fd ≥ "σ " € Fd is unitless S unit = MPa “σ” unit = MPa In general, there will be a different Fd for each different mode of failure for a single component. Consequences and uncertainties may vary from one f...
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