Shock ⚫ A quick estimate of cushion material thickness can be made if the cushion material is treated as a linear, undampened spring. The deflection necessary to maintain a desired acceleration is calculated as follows: where D = required deflection, h = anticipated drop height, G = fragility level (critical acceleration) This formula provides the minimum distance over which the deceleration must take place in order not to exceed the critical acceleration. ( 2) 2 − = G h DShock ⚫ A quick estimate of cushion material thickness can be made if the cushion material is treated as a linear, undampened spring. The deflection necessary to maintain a desired acceleration is calculated as follows: where D = required deflection, h = anticipated drop height, G = fragility level (critical acceleration) This formula provides the minimum distance over which the deceleration must take place in order not to exceed the critical acceleration. ( 2) 2 − = G h D