Piledriving involves a ram striking an anvil, below which is a cushion, helmet, and pile. For a steel pile, the cushion is usually a disc that comprises alternating layers of fibre-reinforced synthetic resin (Micarta or Conbest) and aluminium. To obtain the waveform of the cushion strain and hence the stress on the pile head requires the compressive stress-strain curves (CSSC) for the synthetic resin, both for a solid disc and for a hollow (annular) disc.