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Vertical Array Milli-Pin System for Alternative Joint Technology

机译:用于替代联合技术的垂直阵列毫针系统

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The application of bonded repairs to flight critical aircraft structure is typically on the basis that the structure can sustain design ultimate load in the absence of the repair. The reason for not giving structural credit to adhesively bonded repair to safetycritical structures is the lack of reliable methods to non-destructively inspect an adhesive bond to guarantee its structural integrity. Consequently, when bonded doublers are applied as reinforcement to fatigue susceptible aircraft structure, the same inspection interval is maintained, despite clear reductions in stress and associated damage growth rates. The current paper examines the possibility of combining a novel vertical array milli-pin system (VAMPS) as a new repair technique, which might be employed to enable certification of bonded repairs or replace bonded repairs altogether. Carbon-fibre reinforced polymer laminate was joined using 0.5 mm diameter steel pins with pitch being four times the pin diameter. The effective lap-shear strength and fatigue performance of the 12.5 mm overlap joints prepared using the VAMPS were compared with bonded joints of the same overlap length as well as hybrid joints combining the adhesive and VAMPS. Preliminary data indicates the VAMPS joint residual strength is comparable to the bonded joint and is resistant to fatigue where peak stresses approach 80% of the hot/wet strength of the adhesive joint.
机译:对飞机关键飞行器结构进行保税维修通常是基于该结构在不进行维修的情况下可以承受设计极限载荷的情况。不给予对安全关键结构的粘合修复以结构信誉的原因是,缺乏可靠的方法来无损检查粘合剂以确保其结构完整性。因此,当将粘合的倍增器用作易疲劳飞机结构的加强件时,尽管应力和相关损坏的增长率明显降低,但仍保持相同的检查间隔。本文研究了将新型垂直阵列微针系统(VAMPS)组合为新维修技术的可能性,该技术可用于对保税维修进行认证或完全替代保税维修。碳纤维增强聚合物层压板使用直径为0.5 mm的钢制销钉连接,间距为销钉直径的四倍。将使用VAMPS制备的12.5 mm搭接接头的有效搭接剪切强度和疲劳性能与相同搭接长度的粘合接头以及结合了粘合剂和VAMPS的混合接头进行了比较。初步数据表明,VAMPS接头的残余强度与粘合接头相当,并且在峰值应力接近粘合接头的热/湿强度的80%时具有抗疲劳性。

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