Double-sided copper film and single-sided copper film epoxy/glass fabric laminate for printed circuit board applications were examined for impact strength at different velocities of deformation and different temperatures. An instrumented dart impact tester was employed in the experiments. The single-sided copper laminates were evaluated by first placing the copper film face up facing the impacter, and second by placing the copper film face down away from the dart. It was found that the maximum force of deformation was almost independent of the initial velocity of deformation, and the total energy was found to increase with velocity. In addition, the maximum force and the total energy were found to decrease linearly with temperature for every case. A brittle feature was also prevalent in the damaged composite. A cross-type of fracture was also common where more damage was found with increasing velocity of impact. A combination of brittle failure with fibre pullout, as well as a brittle failure with debonding or matrix failure were also found by examining the fracture surfaces with a scanning electron microscope.
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Rodriguez, E.L. Instrumented dart impact evaluation of composite laminates for printed circuit board applications. J Mater Sci 25, 5269–5278 (1990). https://doi.org/10.1007/BF00580160
- Scanning Electron Microscope
- Total Energy