What is the hardness of carbon fiber compared to steel? Is carbon fiber prone to breaking easily?
The broad recognition of carbon fiber from its initial applications to the present day is largely due to its high-performance advantages, particularly its lightweight properties. In many industries, carbon fiber is favored for its strength and durability. How strong is carbon fiber, and is it prone to breaking easily? How many times harder is carbon fiber compared to steel?
Carbon fiber is eight times harder than steel in terms of strength. It is a fiber material with a high carbon content of over 95%. It has a tensile strength of up to 3500 MPa and a tensile modulus of 250 GPa, showing superior strength performance compared to normal steel. This high strength is a critical reason why carbon fiber can replace traditional steel in many fields.
When it comes to the ease of breaking, carbon fiber strands, especially individual fibers, can break easily as they are much thinner than human hair. However, steel strands of similar size would also easily break. The high axial strength of carbon fiber strands makes them susceptible to fracture under lateral forces, which contributes to the perception that carbon fiber is prone to breaking.
In carbon fiber products, thousands of continuous carbon fibers are combined using a resin matrix material and laid at different angles to achieve high bending modulus. If these products are subjected to loads exceeding their standard limits, it may lead to partial breakage of carbon fiber strands instead of complete failure. This property is why carbon fiber products are used in automotive crash energy absorption applications.
