ASTM C 1557 is the standard test method for determining the tensile strength and elastic (Young's) modulus of single ceramic, glass, carbon and other fibers at ambient temperature. Single fiber specimens are removed from fiber bundles or spools, should have a length at least 1.5 times the gage length, and can be up to 0.250 mm diameter. All specimens are loaded to fracture, at a constant rate of cross-head displacement. A fiber is extracted randomly from a bundle or from a spool. The fiber is mounted in the testing machine, and then stressed to failure at a constant cross-head displacement rate. A valid test result is considered to be one in which fiber failure doesn’t occur in the gripping region. Tensile strength is calculated from the ratio of the peak force and the cross-sectional area of a plane perpendicular to the fiber axis, at the fracture location or in the vicinity of the fracture location, while Young’s modulus is determined from the linear region of the tensile stress versus tensile strain curve.

The grips are designed so that axial alignment of the fiber along the line of action of the machine is accomplished without damaging the test specimen. By means of our testing expertise and modular product design, we will help find the solution that is right for you. Give our test engineers a call today for help configuring the best test machine and accessories according to your standard.

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