5. Structures and Materials

Repair Methods — Quiz

Test your understanding of repair methods with 5 practice questions.

Practice Questions

Question 1

In composite scarf joint repairs, incorporating ±45° E-glass fiber plies primarily enhances which property of the joint?

Question 2

Which surface treatment method best prepares a metallic aircraft panel for adhesive bonding by increasing surface roughness without embedding foreign particles?

Question 3

During a composite wet lay‐up repair with vacuum bagging, if the vacuum pump creates a pressure differential of 80 kPa over a repair area of 0.1 m², what compressive force is applied to the laminate? Show your calculation.

Question 4

A composite patch (CTE $2\times10^{-6}/^\circ\mathrm{C}$) is bonded over an aluminum panel (CTE $23\times10^{-6}/^\circ\mathrm{C}$) along a 0.5 m length. If the assembly experiences a temperature rise of 80 $^\circ$C, what is the differential elongation between aluminum and composite? Show your calculation.

Question 5

In a single‐lap adhesive joint repair, high peel stresses at the ends often lead to joint failure. Which technique most effectively reduces peak peel stress?