Wearable air blast protection device

A method comprising:

• interposing between a high-order blast event generating an air blast wave energy and an exterior portion of a human body
• (a) a layer of a first material shaped and configured to reflect a substantial portion of incident air blast wave energy, the first material having an acoustic impedance substantially mismatched to the acoustic impedance of air;
• (b) a layer of a second material shaped and configured to attenuate utilizing an inelastic response to a substantial portion of the incident air blast wave energy transmitted through the layer of the first material, and shaped and configured for wearing proximate to an exterior portion of a human body, the second material including at least two attenuating-regions, the at least two attenuating-regions including
• (i) a first attenuating-region having a first inelastic response to the incident air blast wave energy transmitted through the layer of the first material, the first attenuating-region comprising a first yield stress, and
• (ii) a second attenuating-region having a second inelastic response to the incident air blast wave energy transmitted through the layer of the first material, the second attenuating-region comprising a second yield stress, wherein the ratio of the first yield stress divided by the second yield stress is greater than 1,
• wherein the layer of the first material includes a front surface and a back surface, the layer of the second material includes a front surface and a back surface, and at least a portion of the back surface of the layer of the first material is proximate to at least a portion of the front surface of the layer of the second material.