The optimization of inspection intervals for composite structures has been proposed, but only one damage type, dent damage, has been addressed so far. The present study focuses on the two main damage types of dent and delamination, and a model for optimizing the inspection interval of composite structures is proposed to minimize the total maintenance cost on the premise that the probability of structure failure will not exceed the acceptable level. In order to analyze the damage characteristics and the residual strength of the composite structure, the frequency, energy, size, and depth of the damage are studied, and the situation of missing detection during the inspection is considered. The structural residual strength and total maintenance cost are quantified corresponding to different inspection intervals. The proposed optimization method relieves the constraints in previous simulation methods, and is more consistent with the actual situation. Finally, the outer wing of aircraft is taken as an example, and with the historical cases and experimental data, the optimization method is verified. The optimal inspection interval is shorter than the actually implemented inspection interval, and the corresponding maintenance cost is reduced by 23.3%. The result shows the feasibility and effectiveness of the proposed optimization method.

中文翻译：

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具有凹痕和分层损坏的飞机复合结构的检查间隔优化

已经提出了用于复合结构的检查间隔的优化，但是到目前为止，仅解决了一种损坏类型，即凹痕损坏。本研究着重于凹痕和脱层这两种主要的破坏类型，在结构失效的可能性不超过可接受水平的前提下，提出了一种用于优化复合结构检查间隔的模型，以最大程度地降低总维护成本。为了分析复合结构的损伤特征和残余强度，研究了损伤的频率，能量，大小和深度，并考虑了检查过程中漏检的情况。根据不同的检查间隔对结构残余强度和总维护成本进行量化。所提出的优化方法减轻了以往仿真方法的局限性，与实际情况更加吻合。最后以飞机外机翼为例，结合历史案例和实验数据，验证了优化方法。最佳检查间隔比实际实施的检查间隔短，相应的维护成本降低了23.3％。结果表明了所提优化方法的可行性和有效性。最佳检查间隔比实际实施的检查间隔短，相应的维护成本降低了23.3％。结果表明了所提优化方法的可行性和有效性。最佳检查间隔比实际实施的检查间隔短，相应的维护成本降低了23.3％。结果表明了所提优化方法的可行性和有效性。