1792. The Application of Composite Design Allowables for Strength, Damage Tolerance, and Durability
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Paper
Abstract
Data concerning composite materials are broad in scope. The data ranges from chemical testing and analysis, to pristine specimen properties by materials engineers, to structural allowables by structures engineers. The latter, must take into account the effects of holes, defects, delaminations, ”design to” impacts, to satisfy the intent of MIL-A-8861 and FAR 25 for static strength, MIL-A-83444 for damage tolerance (with interpretation) and MIL-A-8866 for durability. Each structural allowable to meet the specifications above are obtained from appropriate testing, resulting in different allowables for each loading scenario of each specification. The lowest allowable is then used to design the structure at the appropriate load. A typical structure is used as an example, assuming a design limit load an a lifetime loading spectrum with which to treat the design to meet damage tolerance and durability requirements. The required allowable strain data for holes and delaminations, for both static, residual and fatigue loads are presented and are typical (based on a specific lay-up). using these allowables in the example, resulted in the structure being designed by damage tolerance.
