Traditional pointwise stress assessments often prove inadequate near composite-material interfaces, where steep gradients and singularities complicate the interpretation of finite element results. This technical note explains why nonlocal, volume-averaged failure criteria are better suited for correlating experimental observations with numerical predictions. By reducing sensitivity to mesh-dependent local stress fields, these criteria provide a more robust foundation for developing reliable, decision-grade predictive models.

Reliable strength prediction in laminated composites requires the simultaneous control of discretization and model-form errors. Conventional plate and shell formulations cannot generally provide this control. The hp-version of the finite element method offers a practical solution.

Numerical simulation has substantial unrealized potential due to a disconnect between the professional practice of finite element modeling and the underlying science of numerical simulation. Realizing this potential requires bridging that gap—a challenge that entails overcoming several critical obstacles.

Compliance with ASME and NASA standards on verification, validation, and uncertainty quantification (VVUQ) is often taken as sufficient evidence that simulation results can be trusted. This is a mistake, however. Compliance alone does not answer the question that truly matters to decision-makers: Are the predictions reliable enough for the decision at hand?