There is a lack of understanding on the damage tolerant design of bonded scarf joints, specifically when an existing bondline flaw affects the performance. This paper presents an improved progressive damage modelling methodology for assessing the damage tolerant performance of composite scarf joints containing artificial flaws in the bondline. The developed methodology is validated using an experimental study investigating the influences of design parameters on the strength of scarf joints under quasi-static tensile loading. The presented work gives excellent predictions of joint strength, and significant insight into the initiation, interaction and progression of damage. A new damage tolerant design approach is subsequently proposed for the application of bonded composite scarf joints, particularly in primary aerospace structures. The proposed design approach assesses the state of the stress at the failure-critical regions of adhesive and adherend to inform on damage-tolerant safe design loads, thus improving the future application of bonded composite scarf joints.

对粘结的围巾接头的抗损伤设计缺乏了解，特别是当现有的粘结层缺陷影响性能时。本文提出了一种改进的渐进式损伤建模方法，用于评估在粘结层中包含人工缺陷的复合丝巾接头的耐损伤性能。通过研究设计参数对准静态拉伸载荷下丝巾接头强度的影响的实验研究，验证了所开发的方法。提出的工作可以很好地预测关节强度，并可以深入了解损伤的发生，相互作用和进展。随后提出了一种新的耐损伤设计方法，以用于粘结的复合围裙接头的应用，特别是在主要航空航天结构中。