Which of the following is NOT one of the common types of fiber materials used in composite material?

The correct answer is based on the characteristic use of materials in composite materials. Carbon fibers, glass fibers, and Kevlar fibers are all commonly used in aerospace composites due to their high strength-to-weight ratios and excellent mechanical properties.

Carbon fibers are renowned for their lightweight and high tensile strength, making them ideal for various aerospace applications. Glass fibers are widely used for their good strength and electrical insulation properties. Kevlar fibers are particularly recognized for their high toughness and resistance to impact, which is crucial for certain aerospace components.

In contrast, nickel strands do not possess the necessary characteristics for use in composite materials. Nickel is a metal and is typically not utilized in the same context as fiber materials for structural reinforcement in composites. Therefore, it stands out as the option that is not commonly associated with fiber types in composite materials.