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Unformatted text preview: etrical variations on parts and assemblies. The term “variation” is used here rather than “uncertainties”, because load and temperature strains are predictable as they can be computed using material strength equations or finite element models. For the same reason they are naturally better suited for deterministic analysis. In the case of load strains, these variations or deviations can be translated in terms of torsor components and intervals, according to corresponding six degrees of freedom load values. However, the effects of operation driven variations may also be realistically assimilated to dimensional shifts; displacing the corresponding process uncertainty zones in one direction or another depending on load values. Finally, operation variations address the issue of flexible parts as they encompass load induced strains. Temperature variations are slightly different, as their effects are non directional. Indeed, temperature changes act more as scale factors, increasing or decreasing feature sizes proportionally in all directions. Nonetheless, they can too be represented as torsors, the difference b...
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