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A Multiscale, Physical Criteria Based Approach for Composite Structural Assessment



The ultimate goal of structural assessment is to ensure that a given design is able to accomplish its mission without suffering a structural failure. Traditional structural analysis accomplishes this by using mathematical models to determine the maximum internal stress and strain state of the material and then compare that to measured critical values of the material to determine a margin-of-safety. Those critical properties are directly measurable for metallic materials. Yield and ultimate tensile stress and strain can be directly observed from simple coupon tests. The Von Mises yield criterion for example, provides a reliable, conservative criteria for evaluation of a material subjected to combined loading. Safety margins are based on comparisons to critical material properties. Except in rare cases, analysis and simulation do not attempt to predict catastrophic, two-piece failure.

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