Where does tenacity collide?

In the biomechanics of attached shore animals, tenacity is the clinging force per unit area a creature can resist before it is pulled or pushed off its surface, the property that lets a limpet or mussel hold station against breaking waves. Grenon and Walker's 1981 The tenacity of the limpet, Patella vulgata L.: An experimental approach measured this detachment stress for pulls normal and tangential to the rock and tied it to the animal's suction and adhesive mucus. The referent is a whole-organism adhesion strength in pascals, and it has nothing in common with a yarn's breaking load or a mineral's crumbling behaviour beyond the shared image of holding fast.[1]

Unit

Detachment force per unit area of attachment (kPa)

Recovery means

Not applicable

Measured by

Measured by pulling or pushing the animal off and recording the stress at release, normal and tangential to the surface

In textile physics, tenacity is a fibre or yarn's breaking strength expressed per unit of linear density rather than per unit of cross-sectional area, so it reports strength in a form that is fair across fibres of different fineness and is quoted in centinewtons per tex or grams per denier. Morton and Hearle's Physical properties of textile fibres treats tenacity alongside breaking extension and work of rupture as the core tensile descriptors of a fibre. The referent is a specific tensile strength of a textile material, and it is a different construct from an animal's clinging force or a mineral's mode of fracture, which happen to share the word.[2]

Unit

Breaking force per unit linear density (cN/tex or g/denier)

Recovery means

Not applicable

Measured by

Measured on a tensile tester as breaking load divided by linear density, averaged over many specimens

In mineralogy, tenacity is a descriptive property of how a mineral resists or yields to breaking, bending, cutting, or crushing, sorted into categories such as brittle, malleable, sectile, ductile, flexible, and elastic. Klein and Dutrow's Manual of mineral science lists it among the physical properties used to identify a specimen in hand, distinct from hardness and from cleavage. The referent is a qualitative deformation-and-fracture behaviour of a crystalline solid, not a measured force at all, so it collides with the fibre and limpet meanings only through the shared word for holding together.[3]

Unit

Qualitative class (brittle, malleable, sectile, ductile, flexible, elastic)

Recovery means

Not applicable

Measured by

Assessed qualitatively by bending, cutting, hammering, or scratching a specimen and classing its response