Podcast
Questions and Answers
What type of failure mode is associated with Tension in fibre-reinforced composites?
What type of failure mode is associated with Tension in fibre-reinforced composites?
- Compression
- Matrix cracking (correct)
- Kink band
- Shear
Which fabric type can help control composite anisotropy and save time during the lay-up process?
Which fabric type can help control composite anisotropy and save time during the lay-up process?
- Random
- Woven (correct)
- Unidirectional
- Multiaxial
In a stress-strain curve of a fibre composite with a tough but weak matrix and brittle but strong fibres, what does a high interfacial strength favor?
In a stress-strain curve of a fibre composite with a tough but weak matrix and brittle but strong fibres, what does a high interfacial strength favor?
- Interfacial de-bonding
- Fibre fracture
- Matrix deformation (correct)
- Crack deflection
What is the primary role of a lightweight core material in sandwich materials?
What is the primary role of a lightweight core material in sandwich materials?
For brittle matrices, why is a low interfacial strength desirable?
For brittle matrices, why is a low interfacial strength desirable?
What is the purpose of applying vacuum pressure during the vacuum bagging process?
What is the purpose of applying vacuum pressure during the vacuum bagging process?
Which is a potential advantage of using filament winding over other techniques?
Which is a potential advantage of using filament winding over other techniques?
Why is it safer for workers during vacuum bagging?
Why is it safer for workers during vacuum bagging?
What is a disadvantage of using vacuum bagging as a manufacturing process?
What is a disadvantage of using vacuum bagging as a manufacturing process?
How does filament winding control the resin content of the final product?
How does filament winding control the resin content of the final product?
What is the main advantage of the pultrusion process?
What is the main advantage of the pultrusion process?
What is a limitation of the resin transfer moulding process?
What is a limitation of the resin transfer moulding process?
Which characteristic makes pultrusion favorable for mechanical properties?
Which characteristic makes pultrusion favorable for mechanical properties?
What does VARTM stand for in the manufacturing process described?
What does VARTM stand for in the manufacturing process described?
Why are large mandrels considered costly in the pultrusion process?
Why are large mandrels considered costly in the pultrusion process?
What is a key advantage of resin transfer moulding mentioned in the text?
What is a key advantage of resin transfer moulding mentioned in the text?
What is a major disadvantage of resin transfer moulding according to the text?
What is a major disadvantage of resin transfer moulding according to the text?
Why are prepregs preferred over conventional lay-up techniques as per the text?
Why are prepregs preferred over conventional lay-up techniques as per the text?
What is an advantage of using prepregs in terms of cosmetics mentioned in the text?
What is an advantage of using prepregs in terms of cosmetics mentioned in the text?
Why are prepregs considered expensive according to the text?
Why are prepregs considered expensive according to the text?
What type of polymers become soft and mouldable when heated?
What type of polymers become soft and mouldable when heated?
Which type of polymers can only be reinforced with short fibres or whiskers due to their very high viscosity?
Which type of polymers can only be reinforced with short fibres or whiskers due to their very high viscosity?
What is a key property that a polymer matrix for composite applications must possess?
What is a key property that a polymer matrix for composite applications must possess?
Which type of polymers form as a result of a non-reversible chemical reaction from liquid resin and catalyst?
Which type of polymers form as a result of a non-reversible chemical reaction from liquid resin and catalyst?
Why are thermoset polymers suitable for continuous fibre composite manufacture compared to thermoplastic polymers?
Why are thermoset polymers suitable for continuous fibre composite manufacture compared to thermoplastic polymers?
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Study Notes
- Pultrusion is a process for producing continuous fiber reinforced polymer composite extrusions where multiple fibers are pulled through a resin bath, coated, and then cured in a heated die before being cut into desired lengths for applications like beams and girders.
- Pros of pultrusion include fast and economic impregnation, accurate resin control, straight and highly aligned fibers with high volume fraction, and enclosed resin impregnation area for limiting volatile emissions; cons include unidirectional fibers, high setup costs, and limited geometric variety.
- Resin transfer molding involves laying fiber fabrics in a mold, injecting resin at high pressure, and using vacuum suction for resin infiltration, resulting in high fiber volume laminates with low porosity and the ability to create geometrically complex moldings.
- Prepregging is the process of pre-impregnating reinforcement fibers with resin, offering maximum strength properties, uniformity, reduced waste, and improved cosmetics compared to traditional lay-up methods; however, prepregs are expensive.
- The strength of the reinforcement/matrix interface in fiber reinforced composites affects failure modes like tension, compression, matrix cracking, and fiber cracking.
- Sandwich materials involve a lightweight core covered by skin sheet materials to increase flexural strength and allow for thicker composite components; vacuum bagging aids in producing higher fiber content laminates with better strength but adds cost and requires a higher skill level.
- Filament winding is used for producing hollow cylindrical products by coating fiber tows in resin and winding them onto a rotating mandrel, offering fast and economic fiber lay-down with the ability to control resin content.
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