。1240· 北京科技大学学报 第29卷 构或芯子平压实验方法.北京：中国标准出版社，1987 Philadelphia.1982 [1 American Socicty for Testing and Materiak.ASTM C365-57 [17 Kunimoto T.Yamad H.Study on the buffer characteristics of Standand Test Methods for Fltw ise Compressive Strength of the honeycomb sand ich construction uder dynamic bading.J Sandwich Cores.Anrual Book of ASTM Standards.Part 25. Light Met.1987.37(5:327 Out-of-plane compressive characteristics of brazing mild steel honeycomb structures JING Yu'an HAN Jingtao,GUO Shiju,SONG Bo 1)Materiak Science and Ergineering School,University of Science and Technology Beijing.Beijing 100083.China 2)Materiak Science and Engineering School.University of Science and Technology Liaoning.Anshan 114044.China ABSTRACT The ex perimential investigations on out-of plane compressive characteristics of brazing mild steel honeycomb sandw ich structures were conducted by using a MTS 810 material test system.The influences of structural parameters on the compressive properties of honeycom b sandw ich structures were analyzed in tems of the measured data.Three deformat ion stages i.e.,elastic deformation,plastic deformation and densification, are observed on the stress-strain curve.The initial defo rmation mode depends on the ratio of cell w all thickness to side length (t/a).The yielding mode dominates initial deformation as t/a0.042 7,while the buckling mode dominates initial deformation ast/0 0427.In all structural parameters the cell wall thickness has a strong influence on the initial compressive strength and peak compressive strength,the cell wall side length in the next place,and both the facing thickness and the height of core have a weak influence. KEY WORDS steel honeycomb;sandw ich;composites;stress-strain curves;compressive strength;buckling (下期预告) 紧耦合气雾化制备非晶合金粉末 陈欣欧阳鸿武黄誓成黄伯云 开展了采用紧耦合气雾化方法制备A1基合金粉末的实验和理论研究.利用X射线衍射仪、差热分析 仪、扫描电镜和透射电镜分析了粉末的表面形貌、显微组织和结构特征.根据气雾化过程中熔滴的破碎模式 和冷却行为确定了A]基合金的非晶化临界冷却速率及相应粉末粒径.结果表明：气雾化粉末中存在部分非 晶粉末，非晶粉末的粒径小于26m;该A1基合金的非晶化临界冷却速率大致为10Ks';雾化中熔体的破 碎和冷却是两个相互耦合（矛盾）的过程，快速冷却（大于10K·s)极大地阻碍熔体的充分雾化，同时熔滴 的破碎模式对其冷却行为具有显著的影响.目前紧耦合气雾化技术还只能制得非晶/晶态混合的A!基合金 粉末.构或芯子平压实验方法.北京:中国标准出版社, 1987 [ 16] American Society for T esting and Materials.AS TM C365-57 S tandard Test Methods for Flatw ise Compressive Strength of Sandwich Cores.Annual Book of AS TM Standards, Part 25. Philadelphia, 1982 [ 17] Kunimot o T, Yamada H .Study on the buffer charact eristi cs of the honeycomb sandw ich construction under dynamic loading .J Light Met, 1987, 37( 5) :327 Out-of-plane compressive characteristics of brazing mild steel honeycomb structures J ING Yu' an 1, 2) , HAN J ingtao 1) , GUO Shiju 1) , SONG Bo 2) 1) Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2) Materials Science and Engineering School, University of Science and Technology Liaoning, Anshan 114044, China ABSTRACT The ex perimential investigations on out-of-plane compressive characteristics of brazing mild steel honey comb sandw ich structures were conducted by using a MTS 810 material test system .The influences of structural parameters on the compressive properties of honeycomb sandw ich structures w ere analyzed in terms of the measured data.Three deformation stages, i .e ., elastic defo rmation, plastic deformation and densification, are observed on the stress -strain curve .The initial defo rmation mode depends on the ratio of cell w all thickness to side leng th ( t/ a) .The yielding mode dominates initial deformation as t/a >0.042 7, w hile the buckling mode dominates initial deformation as t/ a <0.042 7 .In all structural parameters, the cell wall thickness has a strong influence on the initial compressive strength and peak compressive strength, the cell w all side leng th in the next place, and bo th the facing thickness and the height of core have a weak influence . KEY WORDS steel honeycomb ;sandw ich ;composites ;stress-strain curves;compressive streng th ;buckling ( 下期预告) 紧耦合气雾化制备非晶合金粉末 陈 欣 欧阳鸿武 黄誓成 黄伯云 开展了采用紧耦合气雾化方法制备 Al 基合金粉末的实验和理论研究 .利用 X 射线衍射仪 、差热分析 仪、扫描电镜和透射电镜分析了粉末的表面形貌、显微组织和结构特征.根据气雾化过程中熔滴的破碎模式 和冷却行为确定了 Al 基合金的非晶化临界冷却速率及相应粉末粒径.结果表明:气雾化粉末中存在部分非 晶粉末, 非晶粉末的粒径小于 26 μm ;该Al 基合金的非晶化临界冷却速率大致为 10 6 K·s -1 ;雾化中熔体的破 碎和冷却是两个相互耦合( 矛盾) 的过程, 快速冷却( 大于 10 4 K·s -1 ) 极大地阻碍熔体的充分雾化, 同时熔滴 的破碎模式对其冷却行为具有显著的影响.目前紧耦合气雾化技术还只能制得非晶/晶态混合的 Al 基合金 粉末 . · 1240 · 北 京 科 技 大 学 学 报 第 29 卷