陈春露
,
刘文博
,
张璐
,
王荣国
,
隋晓东
,
郑达
玻璃钢/复合材料
doi:10.3969/j.issn.1003-0999.2012.01.017
介绍了近年来复合材料层合板分层疲劳模型、数值模拟、以及Ⅰ型Ⅱ型和混合型分层疲劳性能试验的研究进展,并对复合材料层合板分层疲劳性能进一步的研究进行了展望.
关键词:
复合材料层合板
,
分层
,
疲劳
,
模型
,
模拟
,
Ⅰ型
,
Ⅱ型
,
混合型
Xiaolu YU
,
Fuguo LI
,
Yuanchun REN
材料科学技术（英文）
phase-field method to simulate non-dendritic growth during preparation of Al-4Cu-Mg semi-solid alloy by electromagnetic stirring method (EMS method). Several factors such as the disturbance intensity, anisotropy, the thickness of the interface and the ratio of diffusivity in solid and liquid were considered. It is shown that decreasing the thickness of the interface results in more circular outline of particles, and increasing the diffusivity in solid can reduce degree of microsegregation. The disturbance intensity in the model can be connected with current intensity of stator or magnetic induction density impressed. Simulation results show that the larger the disturbance intensity or magnetic induction density, the more globular morphology the original phase in the matrix.
关键词:
Semi-solid metal
,
微观组织
,
模拟
,
相场法
Zhong CHU
材料科学技术（英文）
Simulations are performed on temporal evolution of atom morphology and ordering parameters of Ni-14.5 Cr-16.5 Al alloy during early precipitation process at different temperatures based on microscopic phase-field theory; the relationship between precipitation sequence and mechanism of L12 and D022 structure and precipitation temperature are illuminated. The nonstoichiometric ordered L12 phases appear first with congruent ordering+spinodal decomposition mechanism which is then followed by precipitation of D022 phases at ordering domain boundaries of L12 phases by spinodal decomposition mechanism at 1073 K and 1223 K. The nonstoichiometric L12 phases transform to stoichiometric ordering phases gradually. The incubation period of L12 and D022 phases is shorter at 1073 K than that 1223 K, and growth speed is higher at 1073 K. At 1373 K, L12 and D022 phases appear simultaneously by non-classical nucleation and growth mechanism. After that the particles of D022 phases diminish and disappear gradually; L12 phases grow and single L12 phases are remained at last.
关键词:
Ni-Cr-Al
,
微观相场
,
沉淀
,
序参数
,
模拟
Yutian DING
金属学报(英文版)
The phase-field model coupled with a flow field was used to simulate the solidification of pure materials by the finite difference method. The effects of initial crystal radius, the space step and the interface thickness on the dendrite growth were studied. Results indicate that the grain grows into an equiaxial dendrite during free flow and into a typical branched structure under forced flow. The radius of an initial crystal can affect the growth of side-branches but not the stability of the dendrite's tip when an appropriate value is assigned to it. With an increase in space steps, side-branches appear at the upstream of the longitudinal principal branch and they grow rapidly. With an increase in the interface thickness, the trunk of the longitudinal upstream and lateral principal branches grow longer and become more slender while the number of secondary branches increases.
关键词:
Phase field method
,
强制对流
,
枝晶生长
,
模拟
袁国青
玻璃钢/复合材料
doi:10.3969/j.issn.1003-0999.2006.01.003
机织物层合梁弯曲破坏全过程的数值模拟分析对揭示其破坏规律,评价其耗能能力,预测其极限承载能力都十分有益,并有望在一定程度上代替大量的实验.本文在试验观察的基础上,假定在破坏的全过程中完全服从强度准则,并采用消层模型处理失效层,确定截面的弯矩-曲率关系全曲线,进而运用虚梁法并按分级加曲率的方法得到了机织物层合梁在速度控制加载条件下弯曲破坏的P-δ全曲线.结合实例,给出了理论和试验的比较结果,表明运用本文的方法可以对复合材料机织物层合梁弯曲破坏全过程进行数值模拟.
关键词:
速度控制加载
,
层合梁
,
弯曲破坏
,
全过程
,
模拟
,
弯矩-曲率关系
,
虚梁法
马崇武
,
刘忠玉
玻璃钢/复合材料
用双曲线模型描述土钉周围的摩擦剪应力与剪切位移之间的关系,假定土钉和周围土体的界面强度服从摩尔-库仑准则,并考虑其剪胀性,推导了拉拔过程中土钉位移应满足的微分方程,并用有限差分法进行了求解,模拟了端部位移随拉拔力增加而变化的过程.通过与砂浆黏结玻璃纤维增强塑料(GFRP)土钉室内模型试验的对比,证明了本文方法的有效性,以及计算土钉抗拔承载力时考虑钉土界面剪胀性的必要性.
关键词:
基础工程
,
土钉
,
玻璃纤维增强塑料
,
抗拔
,
剪胀性
,
模拟
,
有限差分
曹克宁
,
白晶莹
,
张立功
,
王景润
,
李思振
,
冯立
电镀与涂饰
采用有限元分析软件ANSYS建立了微弧氧化时AZ40M镁合金试样、辅助阳极及周围电解液环境的有限元模型,对其进行静电场中电场强度与焦耳热的有限元模拟,得出试样设置辅助阳极前后的电场强度及焦耳热分布云图,分析辅助阳极对试样表面电场强度均匀性的影响.将模拟结果与实际试验结果进行对比,认为辅助阳极的设置可以有效解决微弧氧化过程中边缘烧蚀的问题.
关键词:
镁合金
,
微弧氧化
,
边缘烧蚀
,
辅助阳极
,
有限元法
,
模拟
,
电场强度
刘才
,
高林
,
王玉峰
,
张志新
钢铁
针对国内某钢厂42CrMo棒材组织难以控制的问题,通过实测42CrMo棒材的等温转变曲线（TTT）,结合相变动力学和热力学的知识提出了相关的组织转变数学模型,进而利用有限元分析软件ANSYS以及提出的数学模型,对42CrMo棒材轧后冷却全过程的温度场及组织转变过程进行了计算机模拟,所得温度场及组织转变模拟结果与实测结果吻合较好,较准确地反映了42CrMo棒材在实际生产中的温度场及组织变化,表明此方法对组织控制及冷却工艺制度的制定具有一定的指导作用,可大大减少试验浪费,经济及环保效益显著。
关键词:
有限元分析
,
温度场
,
42CrMo
,
棒材
,
等温转变曲线(TTT)
,
组织转变
,
模拟
