孙亚娟
,
王华
,
吕国强
材料科学与工程学报
为优化直流埋弧炉工业硅冶炼过程,建立二维轴对称等离子体电弧的磁流体动力学模型,运用有限元分析软件,计算得到了等离子体电弧的形态特征分布,并与已有的实验测量结果进行了比较.通过计算不同电流、弧长条件下电弧的温度、速度变化以及熔池表平面的热通量组成分布,分析了电弧的形态变化规律和电弧的传热方式,由此计算不同电流值、不同电弧弧长的条件时,电弧向阳极熔池表面传热的效率.结果表明:弧长越长,向熔池表面传热的效率越小;电流越大,向熔池表面传热的效率越高.基于结果分析,工业硅生产应采用长电弧低电流高电压的冶炼模式.
关键词:
直流埋弧炉
,
工业硅
,
数值模拟
,
电弧传热
S.H. Song Y.S. Byun T.W. Ku W.J. Song J. Kim B.S. Kang
材料科学技术（英）
It is known that fiber metal laminates (FML) as one of hybrid materials with thin metal sheets and fiber/epoxy layers have the characteristics of the excellent damage tolerance, fatigue and impact properties with a relatively low density. Therefore, the mechanical components using FML can contribute the enhanced safety level of the sound construction toward the whole body. In this study, the impact performance of carbon reinforced aluminum laminates (CARAL) is investigated by experiments and numerical simulations. Drop weight tests are carried out with the weight of 4.7 kg at the speed of 1 and 2 m/s, respectively. Dynamic non-linear transient analyses are also accomplished using a finite element analysis software, ABAQUS. The experiment results and numerical results are compared with impact load-time histories. Also, energy-time histories are applied to investigate the impact performance of CARAL.
关键词:
Fiber metal laminates (FML)
,
Carbon reinforced aluminum laminates (CARAL)
,
Numerical simulation
,
Impact performance
Guangquan Yue Boming Zhang Fuhong Dai Shanyi Du
材料科学技术（英）
Stiffened thermosetting composite panels were fabricated with co-curing processing. In the co-curing processing, the temperature distribution in the composite panels was nonuniform. An investigation into the three-dimensional cure simulation of T-shape stiffened thermosetting composite panels was presented. Flexible tools and locating tools were considered in the cure simulation. Temperature distribution in the composites was predicted as a function of the autoclave temperature history. A nonlinear transient heat transfer finite element model was developed to simulate the curing process of stiffened thermosetting composite panels. And a simulation example was presented to demonstrate the use of the present finite element procedure for analyzing composite curing process. The glass/polyester structure was investigated to provide insight into
the nonuniform cure process and the effect of flexible tools and locating tools on temperature distribution. Temperature gradient in the intersection between the skin and the flange was shown to be strongly dependent on the structure of the flexible tools and the thickness of the skin.
关键词:
Thermosetting composite
,
加筋壁板
,
共固化
,
数值模拟
