Complete Guide to Tensile Testing of Fiber Materials Using a Universal Testing Machine

The tensile properties of fiber materials are the core indicators for evaluating their mechanical quality. Due to the fact that individual fibers typically have a diameter of only micrometers (such as carbon fibers, which are approximately 10-15 μm), and are fragile in nature, directly clamping them can easily lead to sample fracture at the jaw, making testing challenging.

The standardized testing process primarily comprises the following three steps:

1. Sample preparation and protection

To avoid direct damage to the fibers by the fixture, the "paper frame method" should be employed. The two ends of a single fiber are fixed to the centerline of a specially made paper frame using glue or tape, ensuring that the fiber is straight and not subjected to pre-tension.

2. Installation and alignment

Place the paper frame with the fibers fixed into the pneumatic or flat clamp of the universal testing machine, ensuring that the specimen is perfectly aligned with the force axis. After clamping, use scissors to cut off the left and right sides of the paper frame, allowing the fibers to independently bear the full tensile force.

3. Perform testing

Set a constant tensile speed (such as 0.5mm/min or 1mm/min) according to the standard and initiate the test. The equipment will automatically record the maximum force and elongation at break, thereby calculating the tensile strength and elastic modulus.

Recommended equipment: Fuli Instrument Fiber Material Tensile Testing Machine

In response to the high-precision requirements of fiber testing, FULE Instruments provides the professional FL series fiber material tensile testing machine. This series of models is equipped with a high-sensitivity load sensor (down to 1N) and a dedicated pneumatic wire contact fixture. Coupled with the FULETEST professional measurement and control software, it solves the problem of microfiber slippage or clamping damage.

The Fule testing machine supports multiple international testing standards such as ISO, ASTM, and GB, and can automatically calculate tensile strength, elongation, and stress-strain curves. Whether it's carbon fiber, polyethylene fiber, or biological fiber, the FL series can provide high-precision data support, making it an ideal choice for material research and development as well as quality control.