机车用铝蜂窝夹芯板结构对爆炸作用的响应及防护设计研究

发布时间：2018-01-21 00:42

本文关键词： 爆炸力学动态响应铝蜂窝夹芯板吸能结构优化 AUTODYN　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：铝蜂窝夹芯板由于质量轻、隔音、抗爆和吸能效果好等优良特性,逐渐在航空、车辆、船舶等领域得到广泛应用。为了更好地了解铝蜂窝板的抗爆性能以及吸能特性,为相应结构的优化设计提供理论参考以及技术支持,本文主要采用数值计算方法,模拟外部爆炸冲击载荷对铝蜂窝夹芯板的作用,研究其在冲击作用下结构的动态响应、失稳变形、吸能特性以及结构安全的优化。通过运用非线性显示动力学软件AUTODYN,建立、完善了铝蜂窝夹芯板的三维计算模型;在不同炸药装药条件下,数值计算铝蜂窝夹芯板的各参数变化(包括改变前后面板厚度、夹芯层壁厚、高度以及胞元结构等),并对夹芯板的抵抗爆炸冲击载荷能力以及变形过程中塑性能的吸收特性进行了研究,最后给出了较为具体的结构防护优化方案。研究结果表明:铝蜂窝夹芯板受到爆炸冲击载荷作用时,因"惯性效应",其结构响应满足夹芯板变形的三阶段理论;应变率不敏感性基体材料构成的铝蜂窝夹芯板各结构参数的增加,其抵抗冲击载荷的能力增强与其平台压溃应力的增加相一致;在吸能特性方面,在不同药量的爆炸载荷冲击作用下,铝蜂窝夹芯板表现出较宽的吸能区间以及稳定吸能特性;另外,结构的抗冲击强度降低时,吸能的触发的阈值也降低,同一载荷下其吸能效果增加;在结构安全防护的优化方面,多层铝蜂窝夹芯板与单层铝蜂窝夹芯板相比,其抗冲击能力更优,但临界塑性能量吸收差异不大;此外,临界变形情况下,弧形结构的铝蜂窝板其抗爆性能和吸收塑性能量的能力均优于平板铝蜂窝夹芯板。
[Abstract]:Aluminum honeycomb sandwich panels, due to light weight, sound insulation, anti-explosion and good energy absorption effect and other excellent characteristics, gradually in the aviation, vehicles. Ships and other fields have been widely used. In order to better understand the anti-explosion performance and energy absorption characteristics of aluminum honeycomb plates, it provides theoretical reference and technical support for the optimization design of corresponding structures. In this paper, the numerical calculation method is used to simulate the effect of external explosion shock load on aluminum honeycomb sandwich panel, and to study the dynamic response and instability deformation of the structure under the impact action. Optimization of energy absorption characteristics and structural safety. The three-dimensional calculation model of aluminum honeycomb sandwich panel is established by using nonlinear display dynamics software AUTODYN. The parameters of aluminum honeycomb sandwich panel were calculated numerically under different explosive charge conditions (including changing the thickness of front and rear panel, wall thickness of sandwich layer, height and cell structure, etc.). The resistance of sandwich panels to blast impact loads and the absorption characteristics of plastic properties during deformation are also studied. The results show that the aluminum honeycomb sandwich panel is affected by the blast shock load because of "inertia effect". The structure response satisfies the three-stage theory of sandwich panel deformation. The increase of structural parameters of aluminum honeycomb sandwich panel made of insensitive matrix material at strain rate is consistent with the increase of platform crashing stress. In the aspect of energy absorption characteristics, aluminum honeycomb sandwich panels exhibit wide energy absorption range and stable energy absorption characteristics under the impact of different explosive loads. In addition, when the impact strength of the structure decreases, the threshold of energy absorption trigger also decreases, and the energy absorption effect increases under the same load. In the aspect of structural safety protection, the multi-layer aluminum honeycomb sandwich board has better impact resistance than single-layer aluminum honeycomb sandwich panel, but the critical plastic energy absorption is not different. In addition, under the critical deformation condition, the anti-explosion performance and the ability of absorbing plastic energy of the aluminum honeycomb plate with arc structure are better than those of the flat aluminum honeycomb sandwich plate.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.4;U260.2

【参考文献】