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首页> 外文会议>Symposium of the International Committee on Aeronautical Fatigue >TOWARDS A CERTIFICATION METHODOLOGY FOR ADHESIVELY BONDED STRUCTURES AND REPAIRS
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TOWARDS A CERTIFICATION METHODOLOGY FOR ADHESIVELY BONDED STRUCTURES AND REPAIRS

机译：朝着粘合结构和维修的认证方法

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Certification of modern aircraft structures involves identification of likely failure modes and assessment of the probability of their occurrence under the loads and operating environment expected to be experienced by the structure. The procedures for certification of adhesive bonded structures and repairs are similar to those already applied to mechanically fastened systems; although some small but significant modifications are required to account for the unique aspects of adhesive bonding. This paper provides examples of the modifications required to address demonstrated inadequacies in the current certification procedures for bonded structures. A significant difference between adhesive bonded structures and mechanically fastened systems is the increased susceptibility of the structure to environmental degradation if production processes are either, not appropriate for the operating environment or poorly conducted. The certification of a structure's tolerance to damage initiation and propagation under a bonded repair requires a less conventional approach than for mechanically fastened repairs. Also in contrast to mechanical joints, adhesive bond integrity is not validated by post-manufacture non-destructive inspection methods. A review of possible adhesive bond failure modes leads to recommendations for certification procedures which, when complied with, will result in an acceptable level of operational safety in adhesive bonded structures and repairs. Approaches to certification of bonded structures that have the potential to reduce compliance testing will also be addressed. Although the international aviation community has yet to agree to uniform certification requirements, which has prevented the technology from being exploited to its fullest, adhesive bonded repairs have been in use for many years on RAAF aircraft and have resulted in significant savings in aircraft maintenance costs. Further, the principles proposed here for management of bonding processes have resulted in a reduction in failures of bonded repairs to metallic sandwich panels at a major RAAF repair facility from a baseline of 42% to nearly zero. The authors advocate that certification and demonstrated compliance of the bonding processes is integral to the success of this technology. If the principles of the RAAF management program were applied to initial construction methods, substantial improvements in the service performance of bonded structures would result.
机译：现代飞机结构的认证涉及识别可能的失效模式，并评估其在载荷和操作环境下发生的概率，而是该结构的载荷和操作环境。粘合粘结结构和维修的认证程序类似于已经应用于机械紧固系统的粘合结构;虽然需要一些小但显着的修改来解释粘合剂粘合的独特方面。本文提供了解决当前认证结构中证明不足的修改所需的修改的示例。粘合剂粘结结构和机械紧固系统之间的显着差异是如果生产过程，不适用于操作环境或进行差，则对环境降解的易感性增加。结构对粘结修复下的损伤发起和传播的公差的认证需要较少的传统方法，而不是机械紧固的维修。同样与机械接头相比，通过制造后的非破坏性检查方法未验证粘合剂完整性。对可能的粘合剂债券失效模式的审查导致了用于认证程序的建议，当遵守时，将导致粘合粘结结构和维修中可接受的操作安全水平。还将解决有可能减少合规性测试的粘合结构认证的方法。虽然国际航空界尚未同意统一的认证要求，但这阻碍了这项技术在其最丰富的粘合剂粘结维修中持续多年来在RAAF飞机上使用，并导致飞机维护成本的显着节省。此外，在此提出的用于粘合过程的原理导致在主要RAAF修复设施的粘合修复到金属夹层面板的故障降低，从基线到几乎为零。作者倡导认证并证明粘合过程的遵守是这项技术成功的一体化。如果RAAF管理计划的原则应用于初始施工方法，则会导致债券结构的服务绩效的大量改进。

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