Brittle fracture

Brittle fracture is sudden material failure in which a crack propagates with little plastic deformation, often separating a component into pieces.

Fracture mechanics: The study of how cracks initiate, grow, and affect the strength of materials and structures. It describes the mechanics used to predict whether a brittle crack will grow.
Elasticity: The ability of a material to deform under load and recover its shape when the load is removed. Brittle solids often store elastic energy that can drive sudden crack growth.
Ductile fracture: Material failure preceded by substantial plastic deformation and often accompanied by necking or void coalescence. It contrasts with brittle fracture through extensive deformation and slower crack growth.
Brittle fracture in ships: Sudden cracking and separation in ship structures, notably associated with welded steel hulls in cold conditions. Ship failures exposed how cracks can travel long distances through structural steel.
Crack-tip plasticity: Localized permanent deformation near a crack tip under applied loading. Even nominally brittle fracture can involve a small plastic zone that alters crack resistance.
Stress intensity factor: A parameter describing the intensity of the stress field near a crack tip. It quantifies the crack-tip loading that drives brittle propagation.
Plastic deformation: Permanent deformation that remains after a material is unloaded. Its scarcity before failure distinguishes brittle fracture from ductile failure.
Fatigue: Progressive damage caused by repeated or fluctuating loading, often leading to failure below static strength. Fatigue usually accumulates over cycles, unlike sudden brittle overload failure.
Liberty ship: A class of mass-produced cargo ships built by the United States during World War II. Several Liberty ships suffered dramatic fractures that focused attention on brittle failure in welded structures.
Fracture process zone: The region around a crack tip where damage and inelastic deformation occur before separation. Its size and behavior challenge idealized descriptions of brittle cracks.

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