Day 5 Progress Check

What is the main difference between interim and permanent repairs in composite structures?

Interim repairs restore strength but not durability; permanent repairs restore both.

Why is the use of non-corrosive fasteners essential in composite repairs, especially with carbon fiber structures?

To prevent galvanic corrosion

What is the primary role of high-speed, low-feed rates in cutting composite materials?

To manage the specific challenges of various composite materials

What is one of the key safety measures emphasized in composite repair to handle hazardous materials?

Wearing personal protective equipment (PPE)

Why is it necessary to use specialized equipment and drill bits for machining composite materials?

To prevent delamination and fiber damage

What is the primary reason that composite honeycomb structures are susceptible to damage?

They have a delicate bonded structure with thin face sheets.

Which type of repair is intended to meet strength requirements but is limited by time or usage?

Temporary Repair

During the step-by-step repair process, why is it important to remove any moisture before proceeding?

To avoid damage during curing

What is the maximum damage size for which filler and potting repairs are applicable in sandwich structures?

0.5 inch

When preparing a patch for a bolted repair, why is it important to follow SRM guidelines accurately?

To ensure the patch aligns with structural load paths and maintains integrity

Why are bonded flush patch repairs particularly challenging in solid laminate structures?

They require precise control and cleanliness due to difficulty of inspection.

Which material is commonly used to repair Kevlar® in composite honeycomb structures?

Fiberglass

What is the primary purpose of using vacuum bagging during the repair of composite structures?

To pressurize and remove air during curing

What is one disadvantage of using bolted repairs in composite structures?

They cause damage from drilling and have limited bearing strength.

Which step in the external bonded patch repair process ensures that the repair plies match the original structure?

Laying up repair plies, matching the material and orientation