tenacitet

Tenacitet, or tenacity, is a property used to describe a material's resistance to fracture or rupture under load. The term is used differently across disciplines: in materials science it is often equated with toughness, the ability to absorb energy and resist crack propagation; in textile engineering it is the breaking strength of a fiber per unit linear density.

In materials science, tenacity or toughness is quantified as the energy per unit volume that a material can absorb before fracture, represented by the area under the stress–strain curve up to fracture. It reflects both strength and ductility and depends on microstructure, temperature, loading rate, and flaws. Standard assessments include Charpy and Izod impact tests for energy absorption and fracture-toughness tests for cracked specimens.

In textiles, fiber tenacity is expressed as breaking force divided by linear density, commonly in units such as centinewtons per tex (cN/tex) or grams per denier. It indicates how much load a fiber can withstand per unit mass and is influenced by polymer type, processing, moisture, and the fiber’s microstructure.

Name origin: from Latin tenacitas, “holding fast.” See also toughness, fracture toughness, tensile strength, and fiber strength.