Day 3 Progress Check Flashcards
What is the main advantage of using pre-impregnated (prepreg) products in composite layups?
They ensure a consistent resin-to-fiber ratio and easier handling
Why are sandwich constructions with honeycomb cores used in aerospace structures?
They provide high strength to weight ratios and excellent compression properties
What is a major con of using Kevlar in composite structures?
Absorption of up to 8% of its weight in water
What is the primary characteristic that distinguishes S-glass from E-glass fibers?
Structural strength
What is the role of the “bias” direction in fiber orientation?
It enhances the flexibility and contouring ability of the fabric
Which property of boron fibers makes them particularly useful in military applications?
High temperature resistance
What is the primary function of the matrix in a composite material?
To hold the fibers in place and transfer stresses to the fibers
What is a significant disadvantage of using thermoplastic resins in composites?
They have lower strength compared to thermosetting resins
In a quasi-isotropic layup, how are the fibers oriented?
0°, -45°, 45°, 90°
In composite repair, what does a “wet layup” involve?
Applying dry fibers and then impregnating them with resin just before the repair work starts
Which type of fiber is most commonly used in aerospace applications for its high strength and stiffness?
Carbon/Graphite
Which of the following is NOT an application of ceramic fibers in aerospace structures?
Wing and fuselage structures
Which of the following best describes the primary purpose of a composite material in aerospace applications?
To combine different materials to achieve superior structural properties
In the context of fiber orientation, what does the term “warp” refer to?
The longitudinal fibers of the fabric
Which material is known for its high compression strength and resistance to galvanic corrosion with aluminum?
Boron
