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首页> 外文期刊>International journal of structural stability and dynamics >DYNAMICS AND BUCKLING OF SANDWICH PANELS WITH STEPPED FACINGS
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DYNAMICS AND BUCKLING OF SANDWICH PANELS WITH STEPPED FACINGS

机译：阶梯面夹层板的动力学和屈曲

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Sandwich panels have been developed to either produce lighter structures capable of carrying prescribed loads or increase the load-carrying capacity subject to limitations on weight. In these panels, facings carry bending and in-plane loads while the core functions similarly to the web of a beam, mostly resisting transverse shear. Improvements in the load-carrying capacity of sandwich panels can be achieved through modifications in their geometry, boundary conditions, and material distribution. One of the methods recently considered by the authors is based on using facings with a step-wise variable thickness that increases at the critical region of the structure. It was illustrated that the strength of a sandwich panel can be considerably enhanced using such stepped facings, without a detrimental increase of the weight. The present paper expands the study of the feasibility of the stepped-facing sandwich panel concept concentrating on three structural problems, i.e. a possible improvement in stability, changes in the natural frequencies, and forced dynamic response to the explosive blast. It is illustrated that the stepped- facing design can improve stability of the panel and its response to blast loading. However, fundamental frequencies of stepped-facing panels decrease compared to those in their conventional equal-weight counterparts. Such decrease is detrimental in the majority of engineering applications representing a limitation of stepped-facing panels. Nevertheless, the usefulness of the stepped-facing design is proven in the problems of bending, stability, and blast loading. Numerous examples presented in the paper validate our suggestion that the combination of a relatively simple manufacturing process and an improved structural response of sandwich panels with stepped facings may present the designer with an attractive alternative to conventional sandwich structures.
机译：已经开发出夹心板，以生产能够承受规定载荷的较轻结构，或者在受到重量限制的情况下增加其承载能力。在这些面板中，饰面承受弯曲和平面载荷，而核心的作用类似于梁的腹板，主要抵抗横向剪力。夹层板的几何形状，边界条件和材料分布的变化可以提高夹心板的承载能力。作者最近考虑的一种方法是基于使用具有逐步可变厚度的饰面，该饰面在结构的关键区域增加。已经表明，使用这种阶梯状饰面可以显着提高夹心板的强度，而不会增加重量。本文扩展了对阶梯式夹心板概念的可行性研究，该概念集中于三个结构问题，即在稳定性，固有频率变化和对爆炸的强制动力响应方面可能的改进。可以看出，阶梯式设计可以提高面板的稳定性及其对爆炸载荷的响应。但是，与传统的等重量面板相比，阶梯面板的基本频率会降低。这种减少在大多数工程应用中都是有害的，代表了阶梯式面板的局限性。但是，在弯曲，稳定性和爆破载荷问题上证明了阶梯式设计的有用性。本文中提供的许多示例证实了我们的建议，即相对简单的制造工艺与具有阶梯状饰面的夹心板的改进结构响应相结合，可以为设计人员提供一种替代常规夹心结构的有吸引力的选择。

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