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ASTM D3039 | Composites | Tension Testing

ASTM D3039 is a testing specification that determines the in-plane tensile properties of polymer matrix composite materials reinforced by high-modulus fibers. The calculations that can be derived include ultimate tensile strength, ultimate tensile strain, and tensile chord modulus of elasticity, Poisson’s ration and the transition strain. These values are used to determine the size of structural members, the quantity of reinforcements, and to compute the stress for observed strains. Before conducting ASTM D3039, it is important to read the entire specification in the relevant ASTM publication.

ASTM D3039 | Composites | Tension Testing

  1. Prepare at least five specimens with constant rectangular cross sections as described in the method.
  2. Place the specimen in the fixture by centering it between the grip interfaces. Make sure that the entire grip length contacts the grip faces when the fixture is closed.
  3. Attach the required strain gauges or extensometers to the mid-span, mid-width location of the specimen. In order to determine the modulus of elasticity, longitudinal strain should be measured. To determine the Poisson’s ratio, the strain values in both longitudinal and lateral directions should be calculated.
  4. Apply the load at a constant rate until failure. Record load versus displacement and load versus strain, if extensometers are used. If the specimen breaks, record the maximum force and strain. Ambient temperature and humidity should be maintained as constant as possible through the duration of this test.
Calculations:
  • Ultimate Tensile Strength or Peak Stress
  • Ultimate Tensile Strain
  • Modulus of Elasticity
  • Poisson’s Ratio
  • Transition Strain
  • Chord Modulus of Elasticity

ASTM D3039 | Composites | Tension Testing

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