ASTM E647 describes the general protocol for fatigue crack propagation testing in materials using a pre-notched compact tensile specimen. The test requires simultaneous measurements of crack propagation after the application of tensile fatigue cycles. CPG engineers have developed an automated optical system that captures thousands of images of the propagating crack during the fatigue experiment from a dual camera system. The accompanying analysis software then determines the crack length in each image, outputting the da/dN vs. DK curve described in ASTM E647.
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