Composite materials have gained widespread recognition in various industrial applications due to their exceptional combination of mechanical properties, such as a high strength-to-weight ratio, high modulus-to-weight ratio, good corrosion resistance, and durability. This chapter explores the role of composite repair techniques in enhancing the structural integrity and durability of industrial components exposed to damage before and during service operations. The focus extends beyond the repair and maintenance of composite structures in sectors such as aerospace, automotive, marine, and infrastructure to include their application on metallic parts with defects requiring repair to continue operation. The chapter begins by examining common types of damage encountered in composite parts, including delamination damage caused by applied load, bird strikes, lightning strikes, and tool drops. Subsequently, it reviews various repair techniques, such as plug, scarf, patching, and lap repairs, among others. Special attention is given to selecting repair techniques based on the specific requirements of industrial applications. Steps toward repairing the damaged part, such as inspection, removing and cleaning the damaged area, preparing the repaired material, and employing proper curing techniques to ensure a strong bond between the parent and repaired material, post-inspection, and a limited amount of testing and analysis are all essential for achieving a solid repair. These repairs can be temporary or permanent; nevertheless, the repaired area must undergo inspection to ensure there is no crack growth with the potential to cause catastrophic failure during service usage. Examples of patch repairs on the metallic skin of the fuselage due to crack growth from fasteners are presented to illustrate successful composite repair implementations in aircraft. Damage tolerance analysis of composite patches on the repaired area of metallic skin is essential to determine the absence of potential failure during flight. The effectiveness of these repair solutions in restoring and even enhancing the original performance of components is also discussed. The continued usage of composite materials in industrial applications necessitates continuous study in this area to improve repair techniques and reduce the time and cost of repairs. Overall, this chapter provides valuable insights into the current state and future potential of composite repair technologies in industrial applications for both metals and composite damaged part.

Composite Repairs (Industrial Applications and Analysis)

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发表日期：

2025年

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Bahram Farahmand

摘要

Composite materials have gained widespread recognition in various industrial applications due to their exceptional combination of mechanical properties, such as a high strength-to-weight ratio, high modulus-to-weight ratio, good corrosion resistance, and durability. This chapter explores the role of composite repair techniques in enhancing the structural integrity and durability of industrial components exposed to damage before and during service operations. The focus extends beyond the repair and maintenance of composite structures in sectors such as aerospace, automotive, marine, and infrastructure to include their application on metallic parts with defects requiring repair to continue operation. The chapter begins by examining common types of damage encountered in composite parts, including delamination damage caused by applied load, bird strikes, lightning strikes, and tool drops. Subsequently, it reviews various repair techniques, such as plug, scarf, patching, and lap repairs, among others. Special attention is given to selecting repair techniques based on the specific requirements of industrial applications. Steps toward repairing the damaged part, such as inspection, removing and cleaning the damaged area, preparing the repaired material, and employing proper curing techniques to ensure a strong bond between the parent and repaired material, post-inspection, and a limited amount of testing and analysis are all essential for achieving a solid repair. These repairs can be temporary or permanent; nevertheless, the repaired area must undergo inspection to ensure there is no crack growth with the potential to cause catastrophic failure during service usage. Examples of patch repairs on the metallic skin of the fuselage due to crack growth from fasteners are presented to illustrate successful composite repair implementations in aircraft. Damage tolerance analysis of composite patches on the repaired area of metallic skin is essential to determine the absence of potential failure during flight. The effectiveness of these repair solutions in restoring and even enhancing the original performance of components is also discussed. The continued usage of composite materials in industrial applications necessitates continuous study in this area to improve repair techniques and reduce the time and cost of repairs. Overall, this chapter provides valuable insights into the current state and future potential of composite repair technologies in industrial applications for both metals and composite damaged part.