Tear resistance

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Tear resistance (or tear strength) is a measure of how well a material can withstand the effects of tearing.[1] It is a useful engineering measurement for a wide variety of materials by many different test methods.

Discussion

For example, with

elongation. ASTM D 624 can be applied to measure the resistance to the formation of a tear (tear initiation) and the resistance to the expansion of a tear (tear propagation). Regardless of which of these two is being measured, the sample is held between two holders and a uniform pulling force applied until the aforementioned deformation occurs. Tear resistance is then calculated by dividing the force applied by the thickness of the material.[2]

Materials with low tear resistance sometimes have poor resistance to abrasion and when damaged will quickly fail (this includes hard materials, since hardness is not related to tear resistance).[2]

Tear resistance of different materials

Substances with high tear resistance include epichlorohydrin, natural rubber and polyurethane. In contrast, materials such as silicone and fluorosilicone have low tear resistance.[2]

Tear-yield ratio

The ratio of tear resistance to the

yield strength is called the tear-yield ratio. It is a measure of notch toughness.[3]

Standards by ASTM International

  • C1681-14 Standard Test Method for Evaluating the Tear Resistance of a Sealant Under Constant Strain
  • D1004-13 Standard Test Method for Tear Resistance (Graves Tear) of Plastic Film and Sheeting
  • D1922-15 Standard Test Method for Propagation Tear Resistance of Plastic Film and Thin Sheeting by Pendulum Method
  • D1938-14 Standard Test Method for Tear-Propagation Resistance (Trouser Tear) of Plastic Film and Thin Sheeting by a Single-Tear Method
  • D2212-00(2015) Standard Test Method for Slit Tear Resistance of Leather
  • D2582-16 Standard Test Method for Puncture-Propagation Tear Resistance of Plastic Film and Thin Sheeting
  • D4932/D4932M-89(2014)e1 Standard Test Method for Fastener Rupture and Tear Resistance of Roofing and Waterproofing Sheets, Roll Roofing, and Shingles
  • E604-15 Standard Test Method for Dynamic Tear Testing of Metallic Materials

See also

References

  1. ^ NAHAD GLOSSARY, http://www.nahad.org/aws/NAHAD/pt/sp/hsi_glossaries, 15 June 2012
  2. ^ a b c d Tear Resistance., "Physical Properties: Tear Resistance". Archived from the original on 25 May 2012. Retrieved 15 June 2012., 15 June 2012
  3. ISBN 9780871707321
    .

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