An alternative method of assessment of vessel strain is simply to integrate the standard stress-strain curve for the work energy absorbed. This assumes uniform energy absorption, no effect from the internal structure within the vessel, and of course, that the classic stress-strain curve applies. These are the same assumptions as were made in the Proctor method. Such an integra­tion method is’.

3{?(5o-y + <ти)є(Яе2 — /?;2)2
3.53-108

where the units are those of Eq. (5.10). This equation also assumes, as did Proctor’s, that there is a 67% efficiency in transforming blast into impulse to the vessel wall.