1. Scope
1.1 This terminology standard is a compilation of definitions of technical terms related to force and deformation properties when evaluating a stress-strain curve of a textile. (See Figs. X1.1 and X1.2.) A chart showing the relationship of the basic terms is shown in Table 1. Terms that are generally understood or adequately defined in other readily available sources are not included.
1.2 For other terms associated with textiles, refer to Terminology D123.
TABLE 1 Relationship of Force and Deformation Terms
| Term | Symbol | Mathematical
Expression | Unit |
|---|
| Length | L | | mm (in.) |
| Extension | ΔL | | mm (in.) |
| Strain | | ΔL/L | |
| Elongation | | ΔL/L × 100 | % |
| Linear density | D1A | | tex (den) |
Cross-sectional
area | A | | mm2 (in.2) |
| Force | F | | N (lbf) |
| Tension | T | | N (lbf) |
| Strength | S | | N (lbf) |
| Tenacity | | F/D1A | mN/tex (lbf/den)B |
| Stress | | F/A | N/m2 (lbf/yd2)B |
A In computers, this may be given as “LD” instead of “D1”.
B For fibers, these inch-pound units are usually gf/den and gf/in.2
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D123 Terminology Relating to Textiles
D1578 Test Method for Breaking Strength of Yarn in Skein Form
D5344 Test Method for Extension Force of Partially Oriented Yarn
Keywords
ICS Code
ICS Number Code 01.040.59 (Textile and leather technology (Vocabularies)); 59.080.01 (Textiles in general)
DOI: 10.1520/D4848-98R12
ASTM International is a member of CrossRef.
Citing ASTM Standards
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