ANSYS在电机机械计算中的应用

本文介绍了ANSYS有限元分析软件在电机的静力学(即结构的强度和刚度)分析计算中的应用。本文以一台大型交流电动机的计算作为实例,把作者的一些经验和体会介绍给大家,同时也介绍了ANSYS软件本身的特点和强大功能。     

中心斜裂纹矩形薄板的极限断裂强度分析

对具有中心穿透斜裂纹在弹性断裂和完全塑性断裂两种破坏模式下的断裂强度进行了分析.在弹性破坏模式下,利用应变能密度因子准则对不同的裂纹倾斜角和不同的矩形板长宽比对斜裂纹的初始扩展角度的影响进行了数值计算和讨论.对于延性材料的完全塑性断裂模式,利用弹塑性有限元对不同裂纹倾斜角下的矩形板的极限拉伸强度进行了分析,并对中心穿透裂纹拉伸强度简化计算公式进行了考虑裂纹倾斜角度的修正.     

FRP拉索锚固体系优化及其静力性能评价

针对大吨位多筋FRP拉索锚固存在应力集中、锚固效率低等问题,提出了一种性能可设计的分段变刚度锚固方法,以同源变刚度为设计理念,开发了一种磨碎玻璃纤维改性树脂荷载传递介质.首先,以常用的石英砂改性树脂为对照组,对比分析了2种改性树脂在不同体积掺量下的压缩性能,并利用数值拟合方法揭示了磨碎玻璃纤维改性树脂的压缩强度和弹性模...     

轨道板式车辆减速器的研制

分析了车辆减速器轨枕板基础存在的问题及原因;提出了钢台座轨道板基础的解决方案;采用有限元计算方法对轨枕板和钢台座轨道板基础进行了强度分析和对比;试制了样机并在现场安装使用。轨道板式减速器的研制使基础强度和寿命大幅提高。     

铁路客车转向架构架结构优化分析

以某铁路客车转向架构架为例,结合有限元仿真技术对其定位转臂座强度不足问题进行了结构优化,并提出了相应的建议。     

大跨度系杆拱桥主拱钢-混凝土结合段受力状态分析

以鹰潭市余信贵大跨度中承式钢管混凝土系杆拱桥为研究对象,利用有限元软件分别建立大桥整体数值模型与钢-混凝土结合段局部实体数值模型,计算分析主拱钢-混凝土结合段在设计荷载作用下的受力状态与承载能力。分析结果表明:在持久状况荷载组合下,主拱肋钢-混凝土结合段模型变形连续,最大变形量为0.030 m,主拱肋钢-混凝土结合段结构刚度及变形满足要求;钢-混凝土结合段混凝土最大拉应力为1.63 MPa,钢结构部分Von-Mises等效应力最大值为236 MPa,均小于容许应力,满足结构设计要求;为避免应力集中,须对钢-混凝土结合段的坡口进行细化设计,或调整主跨系杆的张拉力。     

西南某机场水泥混凝土道面板应力计算分析

为了对西南某机场水泥混凝土道面板进行应力分析,通过现场钻芯取样和劈裂实验得出劈裂强度值和基层顶面反应模量。应用ANSYS软件建立三维有限元模型,计算不同飞机荷载作用下的板边应力。由应力折减系数得出板边计算应力,判断道面能够运行的最大飞机重量。比较板边自由与不自由两种状态下道面产生的应力和位移,发现高温作用下道面的受力变化与低温状态下不同,对机场道面在夏季和冬季运行时提出建议。     

Pragmatic regularization of element-dependent effects in finite element simulations of ductile tensile failure initiation using fine meshes

For the evaluation of the structural response in accidental scenarios like ship collisions, the simulation of tensile failure initiation is inevitable. Here, one difficulty is that the process of failure initiation is a very local process, which cannot be simulated in its details at present due to the computing effort which would be required. However, there are various approaches how the failure initiation can be simplified and simulated in finite element models of large thin-walled structures. A short overview of these approaches is given. A pragmatic approach, which is suitable for relatively small elements for the simulation of failure initiation in uniaxial to biaxial stress states, is chosen within this paper for further investigations regarding the applicability for thin-walled steel structures. Exemplary simulations with solid and, in particular, shell elements are used to demonstrate how the effects of element size and other element properties can be considered in the simulation of failure initiation. The focus is also on imperfections that are relevant in simulations with small elements. For this purpose, an indentation experiment is simulated with different imperfections.     

地铁隧道二次衬砌钢筋网防裂性能研究

为了定量分析防裂钢筋网提高隧道衬砌结构抗裂性能的机理和幅度,以地铁双线隧道二次衬砌结构为研究对象,采用荷载结构法和杆系有限元数值模拟方案,定量分析二次衬砌结构不设置与设置钢筋网这2种情况下的开裂临界荷载。其中素混凝土结构以达到极限拉应变为临界状态,衬砌结构增设钢筋网后以达到GB 50157-2013《地铁设计规范》允许的最大裂缝宽度0.2mm为临界状态。分析结果表明,配置防裂钢筋网后,Ⅲ级和Ⅳ级围岩衬砌结构抗裂性能可分别提高22.4%和19.3%,Ⅴ级围岩衬砌结构抗裂性能提高15.2%;Ⅲ级和Ⅳ级围岩二次衬砌结构的破坏形式由脆性破坏变为延性破坏,从而提高了其安全性能。     

Numerical study on the dynamic response of a truncated ship-hull structure under asymmetrical slamming

Dynamic response of ship-hull structure under slamming has tracked widespread attention in the marine structural design. However, our understanding on the dynamic characteristics largely relies on the symmetrical slamming cases. This paper presented a preliminary numerical investigation on the dynamic response of a truncated ship-hull structure under asymmetrical slamming based on the uncoupled CFD-FE method. Asymmetrical slamming loads were predicted through combining the seakeeping analysis and CFD method. In there, three kinds of motions (vertical, horizontal and roll motions) of 2D ship sections were obtained through the seakeeping analysis and then the slamming pressure was predicted through simulating the water entry with various motions based on CFD method. The dynamic response was analyzed through finite element method. Numerical predictions including ship motions, slamming loads and dynamic analysis were validated against published experimental data and numerical calculations. The characteristics of asymmetrical slamming loads were analyzed showing obvious asymmetry in space, and the dynamic characteristic of the ship bow structure was further clarified through discussing the deformation and stress distribution. These results are useful for readers for better understanding the dynamic characteristics of the bow structure under slamming.