ASTM D3039 Tensile Testing for Advanced Composite Materials

0 0

Advanced composite materials, such as reinforced polymer matrix composites, have been identified as an essential growth factor in U.S. manufacturing. Their desirable light weight combined with high stiffness and strength make polymer matrix composites attractive to many industries, especially the aerospace industry.

ASTM D3039 is a helpful guide when testing polymer matrix composite materials reinforced by high-modulus fibers. ASTM D3039 determines the tensile properties of the composite for research and development, quality assurance, and structural analysis and design. The standard asks for a thin flat strip of material having a constant rectangular cross section to be mounted in the grips of a universal testing machine. The tests must be performed a minimum of five times per specimen. Tensile strength can be measured from the maximum load carried before failure.

Researchers should take careful consideration of testing machines and accessories when testing advanced composite materials. According to ASTM D3039, the machine should have a stationary head and an additional movable head. It should have a controlled velocity and an accurate load-sensing device. Excessive bending leads to premature failure and an inaccurate test of elasticity, which can occur with a misaligned machine or misaligned grips. ASTM D3039 considers gripping to be a higher cause of data scatter and testing failure, so it is essential to choose the right grip.