Composite Materials Quiz Questions And Answers

A composite is a material system made of two or more material components.

The higher the amount of reinforcement content in composites, the greater the strength. Reinforcement materials, such as fibers or particles, are added to the composite matrix to enhance its mechanical properties. These reinforcements provide additional strength and stiffness to the composite material, making it more resistant to deformation and failure. Therefore, increasing the amount of reinforcement content in composites leads to an increase in their overall strength.

Thermoplastics are a type of polymer that can be melted and re-molded multiple times without undergoing any significant chemical change. They have a high molecular weight and are composed of long chains of repeating units. This property makes them highly versatile and suitable for various applications, including packaging, automotive parts, and consumer goods. In contrast, hydro plastics and poly plastics are not recognized groups of polymers, while poly resin is a term that can refer to various types of resins, not necessarily polymers. Therefore, the correct answer is thermoplastics.

A glass fiber composite is made up of glass fibers and plastic resin. The glass fibers provide strength and rigidity to the composite, while the plastic resin acts as a binder, holding the fibers together and providing protection against moisture and other environmental factors. The combination of glass fibers and plastic resin creates a lightweight and durable material that is commonly used in industries such as aerospace, automotive, and construction.

Fillers and additives are added to composites to enhance their performance parameters. These parameters include factors such as strength, durability, flexibility, and resistance to various environmental conditions. By adding fillers and additives, the composite material can be customized to meet specific requirements and improve its overall performance. This can include increasing its load-bearing capacity, reducing weight, improving thermal or electrical conductivity, or enhancing its resistance to corrosion or UV radiation. Therefore, adding fillers and additives to composites helps optimize their performance in various applications.

Thermoplastic is comparable to wax because both materials have the property of flowing when heated. Just like wax, thermoplastic softens and becomes more malleable when exposed to heat, allowing it to be easily molded or shaped. This characteristic of flowing when heated is what makes both wax and thermoplastic useful in various applications such as candle making, modeling, and manufacturing of plastic products.

When glass fibers are combined with other fibers, it is referred to as a hybrid. The term "hybrid" implies the combination of two or more different materials or components to create a new composite material. In this case, the glass fibers are being mixed or blended with other types of fibers to create a hybrid composite material with enhanced properties.

Fabrication is the correct answer because it refers to the process of constructing or manufacturing something by assembling and shaping various components. In the context of the question, fabrication would involve shaping raw materials or components to create a finished product. The other options, such as drying, heating, pressurization, and bathing, do not necessarily involve the construction or shaping of a product.

Kevlar is not an example of a thermoset resin because it is a synthetic fiber that is known for its high tensile strength and heat resistance. It is used in various applications such as bulletproof vests and tires. Thermoset resins, on the other hand, are a type of polymer that undergoes a chemical reaction during curing, resulting in a rigid and durable material that cannot be reshaped or melted. Examples of thermoset resins include unsaturated polyester, urethane, epoxy, and glue.

Thixotropic refers to a substance that becomes a gel or thickens when it is at rest or subjected to low levels of stress. This means that the substance has a lower viscosity or flowability when it is being agitated or in motion, but it becomes more solid or gel-like when it is left undisturbed.