In order to understand the quasi-static and dynamic compressive mechanical properties of carbon/epoxy composite laminates consisting of unidirectional carbon fiber plies and carbon fabric plies, several quasi-static and dynamic compression experiments were performed along three principal material axes. Dynamic compress experiments were conducted using the compression split Hopkinson’s pressure bar (SHPB) and MTS machine respectively. The experimental results showed that the materials had obvious strain rate effect. The performance of the composites in each of the three principal directions had unique characteristics. In the vertical direction of the carbon cloth, the materials had an obvious linear constitutive relationship. In-plane along the 0° carbon fiber direction, the carbon fiber controlled the mechanical properties and the strain rate effect. Specimens were also equipped with various failure modes. Failures were due to shear fractures in the normal direction and due to delamination and splitting failures in the in-plane direction. Identical tests were conducted for the unidirectional laminate. The results show that the static compressive strength and the dynamic peak stress values of fabric laminates were higher than those of unidirectional laminates under the same conditions.
Electric-explosive initiator is one of the important firing units in demolition system, its quality effects the safety and reliability of demolition work greatly. Therefore, when using electric initiator, the electric performance of the individual detonator needs to be tested exactly. At present, the equipments being used to test this character are very simple, and their testing means, process and results no longer meet the needs. By using the technologies of virtual instrument and the digital electronic measurement, a test device was demonstrated, designed and manufactured. The proposed system is different from the existing ones by featuring computer control, convenience in use, high precision of parameters setting, automatic data processing, management and judgment.
This paper discusses the response of balanced angle-ply graphite/epoxy composite laminates subjected to different strain rate compression loading using a compression split Hopkinson’s pressure bar (SHPB) and an MTS machine. Five types of laminates, with ply angles 0°, ±15°, ±45°, ±75°and 90°were manufactured using T700 carbon fiber with epoxy resin system by hand. Samples were subjected to compression loading at different strain rates along longitudinal direction. The stress-strain curves at different strain rates were compared for each sample type. Characteristics of the curves were summarized and the causes were analyzed. Finally, the relationship between failure strength and ply angles was analyzed.
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