The most popular method for determining a structural material’s sensitivity to HE is tensile testing with smooth specimens. Since yield strength (YS) is rarely impacted and ultimate tensile strength (UTS) and elongation (El) are typically less impacted, the reduction of area (RA) is typically utilized to quantify HE. The relative reduction of area (RRA), which indicates the ductility loss caused by hydrogen compared to a reference specimen, is a common way to quantify HE. Unfortunately, neither RA nor RRA is valued for strength-based calculations. Hence it is impossible to build safe-life components using these data. Therefore, smooth bar tensile testing is only appropriate for classifying a material’s sensitivity to HE.

According to standards like ISO 527-4, ISO 527-5, ASTM D 638, ASTM D 3039, and ASTM C 297, basic tension or flat tension testing is the most common type of tensile testing for composite materials. Tensile modulus can be calculated using the stress-strain graphs created by these tests.

The minimum specifications for the TensileTurn CNC – Round Tensile Sample Preparation Machine are 220V 1ph VAC 20A. This spherical specimen preparation equipment also needs air with a 90 psi tailstock pressure.

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