A Clarification of the Shock/Vibration Equivalence in MIL-STD-810D/E

This paper presents a methodology for expanding the shock/vibration equivalence analysis defined in MIL-STD-810D/E, Method 516.3/516.4, Procedure I (Functional Shock), Paragraph I-3.3. Procedure I defines equivalence only for situations where the vibration response spectrum (VRS) exceeds the shock response spectrum (SRS) everywhere in the specified range of frequencies. This paper supplements the MIL-STD-810D/E methodology with an analytical procedure for evaluating possible equivalence when the SRS is greater than the VRS. Using Miner's Hypothesis, the fatigue damage potential of the vibration cycles above the 3-δ limit is compared with the fatigue damage potential of the shock pulses in each axis. An example is included.