泡沫铝填充金属波纹板耦合增强机理研究  

Coupling Enhancement Mechanism of Aluminum Foam-Filled Metallic Corrugated Sandwich Panels

作　　者：闫雷雷 赵雪[1] 赵静波 李斌潮[3] 张钱城[2] 卢天健[2] 

机构地区：[1]空军工程大学,陕西西安710051 [2]西安交通大学多功能材料和结构教育部重点实验室,陕西西安710049 [3]西安航天动力研究所,陕西西安710100

出　　处：《稀有金属材料与工程》2018年第2期503-508,共6页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划(“973”计划)(2011CB610305); 高等学校学科创新引智计划(“111”计划)(B06024); 国家自然科学基金(11472209,11472208,11447147,11504429); 陕西省自然科学基础研究计划(2015JQ5155)

摘　　要：将闭孔泡沫铝填充到空心金属波纹板孔隙当中即可获得泡沫铝填充波纹板结构,对其准静态压缩吸能特性进行实验表征。研究表明,泡沫铝填充波纹板其压缩应力远高于泡沫铝与空心波纹板二者单独压缩应力之和,表现出明显的耦合增强效应,其单位质量峰值抗压缩强度及单位质量能量吸收率(SEA)可分别高达对应空心结构的6.3及14.8倍,即使和泡沫铝相比,其SEA仍可提高50%以上。进一步通过对空心波纹芯体结构的屈曲变形模式研究表明,泡沫铝的填充给予了波纹芯体单元足够强的横向支撑,使其变形模式转变为空心结构难以产生的更加高阶的屈曲变形模式,屈曲波长变短,产生耦合增强效应。Aluminum foam-filled corrugated sandwich panels were fabricated by filling closed cell aluminum foam into the spaces of empty corrugated cores, and their out-of-plane compressive behaviors were investigated experimentally. Results show that the compressive stress of the aluminum foam-filled corrugated sandwich panels is much higher than the compressive stress sum of aluminum foam and empty corrugated panel. Thus the foam-filled corrugated sandwich panel exhibits significant coupling enhancement effects. The peak stress per unit mass and specific energy absorption（SEA） of the foam-filled panels could be as large as 6.3 and 14.8 times, respectively, compared to that of the corresponding empty one. Compared to aluminum foam which has excellent energy absorption performances, SEA of the foam-filled corrugated sandwich panel increases by 50%. Peak compressive strength of corrugated panels varying with relative density was predicted theoretically. It is shown that the buckling model of the corrugated core web changes from low order to high order due to foam filling. The high order has shorter wavelength compared to the lower one and requires much larger compressive load; therefore, a significant coupling enhancement effect is caused.

关 键 词：泡沫金属 波纹板 应力-应变 耦合增强 屈曲 

分 类 号：TF125.6[冶金工程—粉末冶金]