An equation has been derived to estimate the impulse intensity function for different "pancake" mines, with different diameter (D) and height (H). The parameters in the equation have been derived by fitting the equation to results from simulations in AUTODYN and GRALE2D. The maximal displacement for a clamped plate caused by a detonation can normally be approximately calculated by a suggested equation. However, it is evident that it is difficult to estimate the effective plastic strain at the centre. Simulations have shown that a "pancake" charge with D/H=4 give about 2.5 times impulse than an explosive with D/H=1. Further, an explosive with D/H=1 give much higher impulse intensity at the centre axis than a hemispherical explosive. For the investigated cases an explosive with D/H=4 given about 87 % larger deflection than an explosive with D/H=1. Further, the plastic effective strain is about 69 % larger. An explosive with D/H=4 give about 190 % larger displacement than a hemispherical explosive.