Tensile Testing of Composite Laminates using Automatic Extensometry (ASTM D3039)
Composite laminates are generally composed of assemblies of layered material. These individual layers often consist of high modulus and high strength fibers in a metallic, ceramic or polymeric matrix. Properties such as tensile strength and modulus are determined by loading specimens to failure.
Tensile testing of composite laminates was performed using 100 kN Hydraulic Wedge grips on a 5900 series frame. To obtain accurate data for measuring modulus and tensile strength an AutoX 750 automatic extensometer was used. It is required to use an extensometer or strain gauge when following ASTM D3039.
ASTM D3039 requires a class B1 extensometer and recommends using a gauge length in the range of 10-50mm. The AutoX can be prompted by the user to move to a specified gauge length. This enables the user to change the gauge length of the extensometer to accommodate a variety of specimens while maintaining a B-1 classification.
Using Bluehill 3 Software, data is recorded and displayed. Parameters such as test control, specimen geometry and calculation can all be added or edited in the software.
After performing these tests, we have concluded that the AutoX 750 is an appropriate extensometer for this application.
Please review ASTM D3039 to ensure a full understanding of the standard.
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.
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5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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