Table 1. Slopes of the load-deformation curves for plywood

Load phase	Tensile (kN/mm)	Compressive (kN/mm)	Difference (%)1)
1st	68.0	97.9	36.1
2nd	79.0	85.6	8.0
3rd	76.2	82.0	7.3

(Compressive – Tensile) / average.