ASTM D4018 Standard Test Methods for Properties of Continuous Filament Carbon and Graphite Fiber Tows
Standard At A Glance
- ASTM D4018
ASTM D4018 is a test method that covers the preparation and tensile testing of resin-impregnated and consolidated test specimens made from continuous filament carbon and graphite yarns, rovings, and tows to determine their tensile properties. It also cover the determination of the density and mass per unit length of the yarn, roving, or tow to provide supplementary data for tensile property calculation.
The test methods determined by ASTM D4018 are intended for the testing of fibers that have been specifically developed for use as reinforcing agents in advanced composite structures. Fiber tows are used along with resin to create composite materials which will ultimately be used for aerospace, automotive, and industrial applications.
Materials Testing System
For testing to ASTM D4018 we recommend a low force table model system such as Instron's 6800 Series. Pneumatic side-action grips allow for repeatable gripping pressure and easy specimen insertion. For strain measurement, an automatic video extensometer such as Instron's AUTOX750 or a non-contacting solution such as the AVE2 are recommended.
|ASTM F4018 Test Setup|
|1)||6800 Series Universal Testing System
|2)||Bluehill Universal Software
|3)||2580 Series Load Cell
|4)||2712-045 Pneumatic Side-Action Grips
|5)||AUTOX750 Automatic Contacting Extensometer
Testing Tips and Tricks
Instron’s Specimen Protect feature can help protect these delicate specimens from excess force being applied before the test starts. It allows the test operator to set the threshold value at the maximum absolute force that the specimen can experience without damage. If the force exceeds this value, Specimen Protect initiates movement of the crosshead to relieve the force on the specimen.
Instron 6800 Series Universal Testing Systems provide unparalleled accuracy and reliability. Built on a patent-pending Operator Protect system architecture with an all-new Smart-Close Air Kit and Collision Mitigation features, the 6800 Series makes materials testing simpler, smarter, and safer than ever before.
Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.
The AutoX 750 is a high-resolution, long-travel automatic contacting extensometer. It can be mounted onto any electromechanical 3300, 5500, or 5900 table top and floor model systems, as well as LX, DX, HDX, and KN static hydraulic testing systems. It is well suited for applications involving plastics, metals, biomedical, composites, elastomers, and more. The AutoX has a maximum travel of 750 mm and accuracy of ± 1 µm.
The second generation Advanced Video Extensometer (AVE 2) utilizes patented measurement technology in the fastest, most accurate non-contacting strain measurement device commercially available.