A dual-meta panel functioning as a sacrificial cladding is proposed and its blast mitigation capacity is investigated in this study. The proposed panel possesses the potential to generate bandgaps that target at a specific range of frequencies to stop stress wave propagating through the panel, leading to the favourable stress wave mitigation for structural protection. Aside from the unique stress wave manipulation capability, more energy can be absorbed by a combination of plastic deformation and local resonance. The effectiveness of the proposed panel is validated through numerical simulations. An analytical solution of wave propagation in an ideal meta truss bar is derived to validate the numerical model with good agreement. It is found that the proposed dual-meta panel exhibits an increase in energy absorption, a reduction in transmitted reaction force (up to 30%), and the back plate central displacements (up to 20%) compared to other conventional sandwich panels, e.g. sandwich panel with hollow trusses and solid trusses, in resisting blast loadings. In pursuit of optimizing the performance of the proposed panel, parametric investigations are also conducted to examine the influences of the plate thickness, boundary condition, and the blast load profiles including duration and intensity on the transient response of the proposed dual-meta panel.

提出了一种双金属面板作为牺牲包层，并研究了其爆炸缓解能力。所提出的面板具有产生针对特定频率范围的带隙的潜力，以阻止应力波通过面板传播，从而为结构保护提供了有利的应力波缓解。除了独特的应力波操纵能力之外，塑性变形和局部共振的结合还可以吸收更多的能量。通过数值模拟验证了所提出小组的有效性。推导了理想亚桁架杆中波传播的解析解，以验证数值模型具有良好的一致性。发现所提出的双元面板显示出能量吸收的增加，与其他传统的夹心板（例如带有空心桁架和实心桁架的夹心板）相比，在抵抗爆炸载荷时，传递的反作用力减小了30％，背板的中心位移减小了20％。为了优化所建议面板的性能，还进行了参数研究，以检查板厚度，边界条件以及爆炸载荷曲线（包括持续时间和强度）对所建议的双元面板的瞬态响应的影响。