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Tensile Properties of Film - ASTM D882
Test specimens should have a width to thickness ratios of at least 8:1. Two sets of specimens are tested for anisotropic materials, the first set parallel to the direction of polymer orientation (MD - machine direction) and the second set perpendicular to the direction of polymer orientation (TD - transverse direction).
Polymer Orientation
| Term | Definition |
|---|---|
| Elongation @ Break | Tensile elongation corresponding to the point of rupture. |
| Elongation @ Yield | Tensile elongation corresponding to the point of yield. |
| Tensile Strength @ Break | Tensile stress corresponding to the point of rupture. |
| Tensile Strength @ Yield | Tensile stress corresponding to point of yield. |
| Secant Modulus | Slope of a line drawn from the point of zero strain to a point on the stress strain curve at a specified strain. |
| Film Toughness | Energy per unit volume absorbed by a specimen up to the point of rupture during a tensile test. The area under the stress strain curve. |