第7期 张国芬等：SG492150型半挂车车架的结构设计与强度和刚度分析 749。 Structure design and strength and stiffness analy sis of an SGA92150 semi-trailer frame ZHANG Guofen,ZHANG Wenm ing,SUN Yuliang,DONG Cuiyan2) 1)Civil and Environmental Engineering School.University of Science and Techmlogy Beijng,Beijing 100083.Chim 2)Beijing Shougang Heavy Duty Truck Marufactory.Beijing 100043.Chima ABSTRACT An SGA92150 semi-trailer frame's lay out,longitudinal girders,crossgirders and joints were de- signed.The stress and deformation of the frame were calculated by using Ansys Workbench softw are with ad- vanced method,and the force analysis and stress calculation of the longitudinal girder were carried out by using M atlab softw are with conventional method.The results show that the frame's strength and stiffness are enough to meet the design requirements. KEY WORDS semi-trailer;frame;structural design;strength analysis;stiffness analysis;finite element method;solid element (上接第738页) Kinetic study on the grow th of ZnO nanorod array films prepared by hydrothermal method GUO Min,DIAO Peng2,WANG Xindong,CAI Shengm in3) 1)Department of Physical Chemistry.University of Science and Technology Beijing.Beijing 100083.China 2)School of Materials Science and Engineering.Beihang Univerity,Beijing 100083,China 3)Colege of Chemistry and Molecular Engineering.Peking University,Beijing 100871,China ABSTRACT By using a low temperature hy drothermal approach,well-aligned Zno nanorod arrays were pre- pared on substrates,which were pre-treated with colloid pre-treating method in different grow th periods of time.Scanning electron microscopy and Xray diffraction spectroscopy were em ployed to study the morphology of ZnO nanorod arrays.Kinetic studies show that the first 8 h is the most important growth period,beyond which the nanorods nearly stop grow ing.During the first 8h,the growth of width of Zno nanorods contains two distinct steps:a fast step within the first 1.5h,in which the nano rods tend to be short and wide,follow ed by a slow step,in which long rods with high aspect ratio are obtained.The length of ZnO nanorod arrays which essentially represents the thickness of a homogeneous monolayer of the thin film,may be experimentally 1 tailored to any required dimension of up to 2.4/m at a grow th rate of approximately 5.5nm"min. KEY WORDS ZnO;nanorods;array films;hydrothermal method;kineticsS tructure design and strength and stiffness analy sis of an SGA92150 semi-trailer frame ZHANG Guofen 1) , ZHANG Wenming 1) , S UN Y uliang 1) , DONG Cuiyan 2) 1) Civil and Environment al Engineering S chool, Uni versit y of Science and Tech nology Beijing, Beijing 100083, C hina 2) Beijing Shougang Heavy Dut y T ruck Manuf actory, Beijing 100043, C hina ABSTRACT An SGA92150 semi-trailer frame' s lay out, longitudinal girders, crossgirders and joints were de￾signed .The stress and deformation of the frame w ere calculated by using Ansys Workbench softw are w ith ad￾vanced method, and the force analysis and stress calculation of the longitudinal girder w ere carried out by using M atlab softw are with conventional method .The results show that the frame' s strength and stiffness are enough to meet the desig n requirements. KEY WORDS semi-trailer ;frame ;structural design ;streng th analysis ;stiffness analysis ;finite element method ;solid element ( 上接第 738 页) Kinetic study on the grow th of ZnO nanorod array films prepared by hydrothermal method GUO Min 1) , DIAO Peng 2) , WANG X indong 1) , CAI Shengmin 3) 1) Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China 2) School of Mat erials Science and Engineering, Beihang Universit y, Beijing 100083, China 3) College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China ABSTRACT By using a low temperature hy drothermal approach, w ell-aligned ZnO nanorod arrays were pre￾pared on substrates, w hich were pre-treated w ith colloid pre-treating method in different grow th periods of time.Scanning electron microscopy and X-ray diffraction spectroscopy w ere employed to study the morphology of ZnO nanorod array s .Kinetic studies show that the first 8 h is the most impo rtant g row th period, beyond w hich the nanorods nearly stop g row ing .During the first 8 h, the g row th of w idth of ZnO nano rods contains tw o distinct steps :a fast step within the first 1.5h, in which the nano rods tend to be short and wide, follow ed by a slow step, in w hich long rods w ith hig h aspect ratio are obtained .The leng th of ZnO nano rod array s, w hich essentially represents the thickness of a homogeneous monolayer of the thin film, may be experimentally tailored to any required dimension of up to 2.4 μm at a g row th rate of approx imately 5.5 nm·min -1 . KEY WORDS ZnO ;nanorods ;array films ;hydrothermal method ;kinetics 第 7 期 张国芬等:SGA92150 型半挂车车架的结构设计与强度和刚度分析 · 749 ·