What is the major difference between brittle and ductile materials?

The main difference between ductile and brittle is that ductile substances are can be drawn out into thin wires whereas brittle substances are hard but liable to break easily.

What is difference between ductile and brittle fracture?

Brittle fracture means fracture of material without plastic deformation or with very small plastic deformation before fracture. Rock, concrete, glass, and cast iron all have such property, so they are called brittle materials. Ductile fracture means fracture of material with large plastic deformation before fracture.

What are ductile and brittle materials?

In other words if materials ductile, materials stretch under tensile load. The ductile materials are Steel, Aluminum, copper etc. Brittle materials break without significant plastic deformation under tensile stress. The brittle material is glass, Plain concrete, cast iron, etc.

Are polymer a ductile or brittle materials?

As discussed above, at the lowest temperature, polymers are brittle. As the temperature increases they become more tough until they reach Ductile-Brittle Transition.

What is the difference between ductile and brittle materials with stress strain curve?

A typical stress–strain curve for a brittle material will be linear. Ductile materials will experience plastic deformation and necking before they fracture. Brittle materials will reach their yield strength and fracture without any plastic deformation. An example of a ductile material is steel.

Which is harder brittle or ductile?

Brittle materials (ceramics, concrete, untempered steel) are stronger (higher tensile strength -yield point and u.t.s) and harder than ductile, as they do not undergo significant plastic elongation / deformation and fail by breaking of the bonds between atoms, which requires a tensile stress along the bond.

Why is PMMA brittle?

PMMA has larger elastic modulus and cavitates after yielding because of sidechains. The large number of sidechains in PMMA results in its larger elastic modulus. Flexibility reduction by the sidechain “coating” leads to microscopical brittleness.

What makes polymers brittle?

Fracture of brittle polymers is typically caused by cavitation and crazing. Cavitation is the formation of voids during deformation due to excessive stress which is often a precursor to crazing. They usually form inside the amorphous phase during deformation of the polymer.

What is the difference between true and engineering stress?

True stress is the applied load divided by the actual cross-sectional area (the changing area with time) of material. Engineering stress is the applied load divided by the original cross-sectional area of material. Also known as nominal stress.