共查询到20条相似文献，搜索用时 15 毫秒
1.
The paper presents the theory of Hamilton variation principle which is the current method for impact problem,central difference method which is efficient solution of finite element (FE)method for impact problem and adapts to solve non-linear dynamic problem.And it introduces the ANSYS/LS-DYNA which is the popular FE software for impact problem both at home and abroad.Then it gives solutions for one simple model by analytical method and ANSYS/LS-DYNA respectively to validate function of software,and they are consistent.Afterward,it gives model of singlelayer Kiewitt reticulated dome with a span of 60 m,and the cylinder impactor,and introduces the contact interface arithmetic,especially the material model of steel (piecewise linear plasticity model) which takes stain rate into account and makes steel failure stress higher under impact loads.The vertical displacement,stress in main members,and the plastic deformation for dome under impact loads were obtained.Then four failure modes (no failure,moderate failure,global failure and slight failure) were summarized according to the rules of dynamic response.And the characteristics of dynamic response for each failure mode were shown. 相似文献
2.
The paper presents the theory of Hamilton variation principle which is the current method for impact problem, central difference method which is efficient solution of finite element (FE) method for impact problem and adapts to solve non-linear dynamic problem. And it introduces the ANSYS/LS-DYNA which is the popular FE software for impact problem both at home and abroad. Then it gives solutions for one simple model by analytical method and ANSYS/LS-DYNA respec-tively to validate function of software, and they are consistent. Afterward, it gives model of single-layer Kiewitt reticulated dome with a span of 60 m, and the cylinder impactor, and introduces the contact interface arithmetic, especially the material model of steel (piecewise linear plasticity model) which takes stain rate into account and makes steel failure stress higher under impact loads. The vertical displacement, stress in main members, and the plastic deformation for dome under impact loads were obtained. Then four failure modes (no failure, moderate failure, global failure and slight failure) were summarized according to the rules of dynamic response. And the characteristics of dynamic response for each failure mode were shown. 相似文献
3.
O形密封圈的非线性有限元分析 总被引：1，自引：0，他引：1
利用大型有限元分析软件ANSYS，考察了橡胶O形圈的大变形引起的几何非线性和接触非线性，建立了橡胶O形圈和沟槽接触的轴对称非线性有限元分析模型，分析了橡胶O形圈在安装使用中，其沟槽内的接触情况和橡胶O形圈内应力的分布规律，为橡胶密封件的设计开辟了一条新方法。从而为进一步可靠设计、优化橡胶O形圈提供了理论依据。 相似文献
4.
The dynamic characteristics and failure modes of steel reinforced concrete (SRC) columns subjected to blast loading are complicated because of the transient stress wave in the SRC columns and the interaction between steel and concrete. This paper presents a numerical simulation of the response of SRC columns subjected to blast loading using hydrocode LS-DYNA. In the numerical model, a sophisticate concrete material model (the Concrete Damage Model) is employed with consideration of the strain rate effect and the damage accumulation. An erosion technique is adopted to model the spalling process of concrete. The possible failure modes of SRC columns are evaluated. It is observed that the failure of SRC columns subjected to blast load can generally be classified into three modes, namely, a direct failure in concrete body due to the stress wave, a transverse shear failure near the support sections due to the high shear force, and a flexural failure pertaining to large local and global deformation of the reinforcing steel. 相似文献
5.
杨玻 《宁波职业技术学院学报》2012,(2):73-76
介绍了在有限元理论分析的基础上,对整个矫直过程建立了符合实际工况的理论模型、边界条件及摩擦类型等,运用ANSYS/LS-DYNA软件对17辊上辊全可调式铜板矫直机的矫直过程进行动态模拟,得出相关的分析结果。 相似文献
6.
A modified 3D finite element (3D-FE) model is developed under the FE software environment of LS-DYNA based on characteristics of stagger spinning process and actual production conditions. Several important characteristics of the model are proposed, including full model, hexahedral element, speed boundary mode, full simulation, double-precision mode, and no-interference. Modeling procedures and key technologies are compared and summarized: speed mode is superior to displacement mode in simulation accuracy and stability; time truncation is an undesirable option for analysis of the distribution trend of time-history parameters to guarantee that the data has reached the stable state; double-precision mode is more suitable for stagger spinning simulation, as truncation error has obvious effects on the accuracy of results; interference phenomenon can lead to obvious oscillation and mutation simulation results and influence the reliability of simulation significantly. Then, based on the modified model, some improvements of current reported results of roller intervals have been made, which lead to higher accuracy and reliability in the simulation. 相似文献
7.
为研究大型钢制拱顶式储油罐在可燃气体爆炸作用下的破坏和变形特征,对多个储油罐缩比模型进行爆炸实验. 并利用 ANSYS/LS-DYNA 软件,建立了缩比为 1: 25 的 5 000 m3储油罐数值模型,对模型在爆炸冲击作用下的破坏过程进行数值模拟. 实验与数值结果表明: 爆炸冲击波对储油罐缩比模型具有瞬间突跃增压的冲击特性,罐壁迎爆面驻点区域超压峰值最高; 迎爆面中部驻点区首先屈服并带动相邻部分达到屈服状态,同时在变形区周围明显形成不规则的塑性铰环,导致罐壁产生内凹屈曲. 在此过程中,罐内液体既对罐壁产生一定的冲击作用,也能吸收和耗散部分爆炸能量. 相似文献
8.
研究目的：通过非线性动力有限元分析,模拟多塔斜拉桥在多点激励下的地震响应以及揭爪其在强震下的倒塌破坏模式。创新要点：解决了多塔斜拉桥的非线性动力数值模拟技术,并首次模拟了多塔斜拉桥在强震下的破坏模式。研究方法：首先采用隐式的Newmark-β法求解多点地震激励下的非线性动力方程（图3）,随后采用显式的中心差分格式对强震作用下桥梁的倒塌破坏过程进行数值仿真（图4）。重要结论：1．单主梁模犁的数值结果可以很好地反映地震模拟振动台试验的地震响应结果;2．在加速度峰值为4．0m／s2的E1。Centro波时,多塔斜拉桥模型只出现了中塔支座的破坏;3．在加速度峰值为4．0m／s2的江心波时,多塔斜拉桥模型先后出现了支序破坏、拉索与塔的连接破坏以及中塔上塔柱段的单元失效。 相似文献
9.
倒T型钢混凝土组合梁正截面抗弯承载力计算分析 总被引：1，自引：0，他引：1
由一般的非对称性工字型钢混凝土组合梁,采用变形协调模型推导总结不同情况下的型钢混凝土组合梁正截面抗弯承栽力计算公式,进而得到倒T型钢混凝土组合梁的正截面承载力。通过算例,采用推导的理论公式及ANSYS软件对等截面、等含钢量的两类组合梁的极限承栽力进行分析计算,表明倒T型钢混凝土组合梁正截面受力较工字型钢混凝土组合梁好及采用的理论公式是正确可行的。 相似文献
10.
11.
研究目的：为求解钢轨（短波）波磨处的高速轮轨瞬态滚动接触建立有限元模型,研究影响高速钢轨波磨发展的重要因素。削新要点：1．求解不同牵引条件下轮轨间的瞬态法和切向滚动接触问题,并考虑真实轮轨几何和钢轨波磨,最高模拟速度达500km／h;2．基于模拟结果,解释了中国高速线路上发现的钢轨波磨很快稳定下来的现象。研究方法：1．详细分析钢轨波磨处高速轮轨瞬态滚动接触的法、切向解以及由此导致的V-M等效应力和摩擦功沿轨面的波动;2．变化波磨波长、波深及重要滚动参数如速度和牵引系数等,研究它们对波磨处滚动接触行为的影响;3．对比上述有限元模型与传统多体动力模型在波磨处的法向轮轨力结果。重要结论：1．法、切向轮轨力及法、切向接触应力均随着波磨几何呈周期性波动,但相位略有差异,V-M等效应力和摩擦功的波动形式接近切向接触应力;2．牵引系数越大,波磨处V-M等效应力和摩擦功的波动范围越大;3．名义参数下,对于所研究高铁系统,波长为80mm左右、速度为250-300km／h时波磨的动态响应最大,这与现场观测相符;4．传统多体动力模型会高估钢轨波磨激励的法向轮轨力;5．钢轨波磨会逐渐稳定下来,通过速度越高进入稳定越快。 相似文献
12.
采用有限元分析软件ANSYS对网格框架墙体进行了数值模拟,并结合前期试验,进行了数值结果与试验结果的比较。比较分析认为ANSYS软件能够较好地模拟墙体内力和变形发展的全过程以及裂缝的形成与发展过程,可以满足实际工程实施与科学研究的精度要求。在此研究基础上,又对前期试验中没有涉及到的其他参数进行了模拟,从而完善了影响钢筋混凝土网格框架新型墙体抗震的其他因素。 相似文献
13.
JIANG Wugui FU Mingfu CHEN Liangsen GENG Shiqi Department of Materials Science Engineering Nanchang Institute of Aeronautical Technology Nanchang Jiangxi P.R. China Institute of Engineering Mechanics Nanchang University Nanchang Jiang 《重庆大学学报(英文版)》2004,3(1):78-81
~~6.ConclusionsJaumannsrate,FusrateandWusratewereincorporatedintotheendochronicequationstoanalyzesimpleshearfinitedeformation.Incrementalequationsandnumericalsolutionsarepresentedforthreeendo-chronicobjectivemodels.TheresultsshowthatanoscillatoryshearstressresponsetoamonotonicallyincreasingshearstrainoccurswhentheJaumannsrateobjectivemodelisemployedforendochronicmaterials.Theoscillatoryresponseisdependentontheadoptedobjectiverate.ComparedwiththeJaumannsrate,theFusrateandtheWusratesatisfythe… 相似文献
14.
采用ANSYY Workbench对数控插齿机主轴进行有限元分析。在软件DM中建立主轴模型,利用软件的自动划分网格技术划分网格,并施加载荷和约束、求解;利用输出的主轴的正应力曲线、主轴总变形和主轴在Y方向的变形曲线对主轴性能进行分析。 相似文献
15.
Bearing Capacity and Technical Advantages of Composite Bucket Foundation of Offshore Wind Turbines 总被引：1，自引：1，他引：0
Based on mechanical characteristics such as large vertical load,large horizontal load,large bending moment and complex geological conditions,a large scale composite bucket foundation (CBF) is put forward.Both the theoretical analysis and numerical simulation are employed to study the bearing capacity of CBF and the relationship between loads and ground deformation.Furthermore,monopile,high-rise pile cap,tripod and CBF designs are compared to analyze the bearing capacity and ground deformation,with a 3-MW wind generator as an example.The results indicate that CBF can effectively bear horizontal load and large bending moment resulting from upper structures and environmental load. 相似文献
16.
The endochronic equations proposed by Valanis (1980) were extended to a finite deformation range. Jaumann's rate,Fu's rate and Wu's rate were incorporated into the endochronic equations to analyze simple shear finite deformation. Incremental equations and numerical solutions are deduced for three endochronic objective models. The results show that an oscillatory shear stress response to a monotonically increasing shear strain occurs when the Jaumann's rate objective model is employed for endochronic materials. The oscillatory response is dependent on the adopted objective rate. Compared with the Jaumann's rate, the Fu's rate and the Wu's rate satisfy the restrictions to elastic-plastic constitutive relations and are in agreement with the experimental results. 相似文献
17.
Yttria-stabilized tetragonal-zirconia polycrystals (Y-TZP) have been shown to have superplastic properties at high temperatures, opening a way for the manufacture of complex pieces for industrial applications by a variety of techniques. However, before that is possible, it is important to analyze the deformation and fracture mechanisms at a macroscopic level based on continuum theory. In this paper, an elastic-plastic material model with a theoretical large deformation is constructed to simulate the true stress-true strain relationships of superplastic ceramics. The simplified constitutive law used for the numerical simulations is based on piecewise linear connections at the turning points of different deformation stages on the experimental stress-strain curves. The finite element model (FEM) is applied to selected tensile tests on 3-mol%-Y-TZP (3Y-TZP) co-doped with germanium oxide and other oxides (titanium, magnesium, and calcium) to verify its applicability. The results show that the stress-strain characteristics and the final deformed shapes in the finite element analysis (FEA) agree well with the tensile test experiments. It can be seen that the FEM presented can simulate the mechanical behavior of superplastic co-doped 3Y-TZP ceramics and that it offers a selective numerical simulation method for advanced development of superplastic ceramics. 相似文献
18.
基于Jones-Harris方法建立了调心球轴承的动力学模型,应用Newton-Raphson方法对轴承动力学方程组进行了求解,开发了相应的计算程序.完成了该轴承的离心力、陀螺力矩、接触载荷、接触角、径向变形与径向刚度等动态特性参数分析.分析结果表明：转速与载荷是影响接触角大小与接触载荷分布最主要的2个因素;滚子的离心力与陀螺力矩随着转速的上升而增大,在此影响下外圈接触载荷增大而内圈接触载荷减小;受离心力的影响,外圈的接触角减小而内圈的接触角增大,且随着转速的增加,内外圈接触角的差值越来越大;轴承的径向刚度随着转速的上升而下降,而滚道沟曲率系数也对轴承径向刚度有一定程度的影响. 相似文献
19.
在实际情况下,薄壁四点轴承与轴承座、轴的配合对薄壁轴承载荷分布、承载能力、轴承刚度有着很大影响。建立腕关节薄壁四点接触球轴承—基座—空心轴构成的轴承系统有限元模型以模拟轴承配合,从而选择最佳配合模型,对实际情况下的轴承配合具有指导意义。基于 ANSYS 有限元软件建立薄壁四点接触轴承不同配合的有限元模型,通过对不同配合模型接触特性进行有限元分析,得出薄壁四点接触球轴承较为精确的椭圆接触区域形状和四点接触状态。对于轴承配合模型 H7 在内外套圈与空心轴及基座接触时有明显应力集中现象,由于轴承滚珠并非在侧面对称,导致轴承与基座及空心轴在靠近滚珠的一边出现应力集中情况。对不同配合的有限元模型进行静态接触特性分析,发现各轴承配合整体等效应力最大值、外圈等效应力最大值、接触应力最大值、基座等效应力最大值区别不大,选择 K7/j7 的轴承配合模型才能使轴承内圈与空心轴的最大等效应力最小。计算结果较为精确地模拟了薄壁四点接触球轴承的接触特性和载荷分布规律,对于实际情况下轴承装配具有一定指导意义。 相似文献
20.
赵广辉 《鞍山师范学院学报》2016,(2):33-36
物流分拣机中升降装置需高频率的上下往复运动,其剪叉臂孔与轴配合部位常出现磨损现象。本文从剪叉式提升机构经常出现问题的部件入手,采用了先进的数值模拟软件ANSYS,利用虚拟仿真手段,分析其可能出现故障的位置及故障方式,提出物流分拣机剪叉式提升机构的改进措施。 相似文献