"Hi, first of all,it is necess to divide two concepts; strength under static and dynamic (impact) loading. Slow varying loadings in stress analysis of deformable solids are assumed ot be statically applied and the equations of static balance are used to find static stresses. In such approach, largest acting static stress (or equivalent in the case of non-uniaxial stress state) is compared with ultimate strenght of the  material.It is determined in results of standard static tension test. In the case, when external force is the function of time, two ways exist. In the case of sudden loding by falling body, for example, the simplified approach is applicable, when you use the balance of kinetic energy of falling body with strain energy accumulated in defom solid to calculate so called dynamic factor.Under this conditions, maximum static stress (generated by statc application of the force) are multipl by dynamic factor to find dynamic stresses,which are correlated with mentined above ultimate strenth of the material. More fast loadings (for example, high velosity striking ) in microsecond range of time. demand description of stress wave propagation in the solid and application of dynamic elastisity principles to find maximum dynamic stress in the solid." (Demenko, 2016 )

Dear Harry Barton Essel

Thank you for your reply. I apologize to reply and thank you late.

Could I say in brief that you commented above:

Impact pressure due to impact load using a falling hammer = mass of the hammer x gravitational acceleration x height of falling hammer :

could be related to and equivalent to the static pressure of same amount?