筘座组合体优化设计

建立了筘座组合体三维有限元分析模型,并用有限元技术分析了无梭织机筘座组合体.针对分析结果,优化设计了筘座组合体并经实验表明,虽然筘座脚质量减小,但打纬作用力相同,且最大应力值降低.最后对筘座组合体的改进进行了探讨.     

心电监测服与人体有限元分析模型的建立

为仿真与分析心电监测服与人体模型在模拟穿着状态下压力分布,采用手持式三维扫描仪对穿着监测服的人体模型扫描,得到完整的点云数据。利用逆向工程软件Geomagic studio对点云数据进行预处理和模型重建,得到相应的曲面模型。通过有限元软件abaqus对得到的监测服和人体曲面模型进行网格划分,生成高质量的网格模型。由监测服和人体模型曲面的偏差分析结果可知,模型曲面光滑程度符合建模精度要求;模型的网格划分没有缺失,证明建立的心电监测服与人体有限元分析模型有效。     

工业水洗机转笼结构设计的有限元分析

根据一般的转笼结构形式和实际受力状况,建立有效的转笼在工作过程中的静力学模型和动力学模型,对转笼在高速脱水状况下的偏心激震力大小和分布规律进行分析,利用有限元分析工具,有效控制转笼转笼的受力变形和疲劳破坏等实际问题。针对某工业水洗机转笼建立分析模型。利用有限元软件Cosmosworks对转笼改进进行变形控制和结构优化。图13表1参10     

汽车动力总成橡胶悬置结构分析与优化研究

文章围绕汽车动力总成橡胶悬置结构进行分析,针对汽车动力总成橡胶悬置结构实物,构建有限元模型,并通过计算橡胶三向刚度水平的方式,对比实验结果,证实有限元分析模型的正确性。在此基础之上证实引入神经网络、非线性有限元分析、以及遗传算法的橡胶悬置结构优化设计方案具有良好的可行性。     

ABAQUS强度折减法在边坡稳定性分析中的适用性研究

基于"四好农村路"建设边坡稳定性分析需要,开展有限元分析软件ABAQUS结合强度折减技术在边坡稳定性分析中的适用性研究。通过建立边坡有限元数值分析模型及Geo-SLOPE边坡极限分析模型进行对比验证,边坡安全系数均接近1,塑性滑裂面位置和形状非常接近。结果表明,基于ABAQUS强度折减法的边坡稳定性分析结果准确可靠,将边坡临空面处边坡顶点位置选取为特征点且依据其水平位移与抗剪强度折减系数之间的关系曲线来确定边坡安全系数简单可行。     

飞机配电箱散热分析

根据飞机配电箱研发时面临的散热问题,通过开发试验及有限元分析,并且引入接触电阻,热阻影响,验证有限元分析模型,输入,边界条件的准确性。     

辊式磨粉机磨辊的受力计算和强度分析

针对目前磨粉机的设计大多根据经验进行,缺乏工作状态的基础设计数据的状况,通过研究辊式磨粉机磨辊动力传递的规律,分析计算了磨辊的受力情况;运用有限元分析软件ANSYS建立了磨辊的物理分析模型,并进行了强度计算分析,结果显示了磨辊在稳态工作状态下的应力应变情况.     

连续梁桥顶推施工临时支墩受力分析

以某顶推施工为工程实例,利用有限元分析软件Midas Civil建立了主梁顶推过程分析模型,分析了顶推过程中临时支墩的支反力随顶推过程的变化趋势;建立了临时墩的有限元分析模型,分析了临时墩在水平荷载和竖向荷载作用下的受力性能,分析结果和实际施工效果表明,设计结构满足施工要求。     

球阀壳体的有限元分析

运用三维设计软件建立了球阀壳体的三维实体模型,利用有限元分析软件建立了球阀壳体结的有限元分析模型并进行强度分析,得出球阀壳体的最大应力和应力分布规律,为球阀结构的安全合理设计和进一步优化奠定了良好的理论基础。     

客车车架模态及瞬态响应分析

应用Pro／E软件建立少林客车车架的三维模型，通过Ansys的专用接口导入Ansys软件中以生成有限元分析模型，并对车架进行模态分析和瞬态响应分析，求得车架的前7阶模态．在此基础上对结构进行改进，改进后的一阶固有频率为32．271Hz，介于非簧载质量的固有频率和怠速运转频率之间．假设汽车前轮突然受到路面一冲击载荷F0=200kN，持续时间td=1s的作用，对改进后的车架结构进行瞬态响应分析，得到位移响应的最大值为0．125mm．     

Finite element analyses of tensile impact behaviors of co-woven-knitted composite from unit-cell approach

This paper reports finite element analyses of tensile impact behaviors of co-woven-knitted (CWK) composite from a unit-cell model. A unit-cell model was established to characterize the microstructure of the CWK composite. A vectorized user-defined material subroutine was written and connected with commercial finite element analysis (FEA) software package ABAQUS to calculate the tensile failure of the CWK composites. The FEA results were also compared with the experimental results of the CWK composites under high strain rate tension obtained from the split Hopkinson tension bar apparatus. The comparisons indicate that the FEA results agree well with the experimental results. The failure mechanisms of the CWK composite under the different strain rates are also discussed.     

换热器管板有限元分析模型研究

建立3种换热器管板有限元分析的简化模型:当量实心板与杆单元模型(模型A);实体管板与杆单元模型(模型B);实体管板与壳单元模型(模型C),通过典型算例,将3种简化模型的计算结果与全实体模型(模型D)进行对比分析。结果表明,模型C管板的应力强度、轴向位移及管束轴向力均与实体模型D较为接近,且得到保守结果,计算精度及效率优势较为明显。     

Experimental investigation and numerical simulation of three-point bending fatigue of 3D orthogonal woven composite

This paper reports the three-point bending fatigue behavior of three-dimensional (3D) orthogonal woven composite (3DOWC) in experimental and finite element analysis (FEA) approach. In experimental, the S–N curve was obtained to illustrate the relationship between applied stress levels and number of cycles to failure. The stiffness variation was recorded to present the degradation of mechanical properties of the 3DOWC during the process of fatigue loading. Furthermore, the fatigue damage morphologies of the tested 3DOWC coupons were given to indicate the damage modes of different parts (resin, yarns, and their interface) of the composite under the range of stress levels. In FEA approach, a user-defined material subroutine UMAT which characterizes the stiffness matrix and fatigue damage evolution of the 3DOWC was developed and incorporated with a finite element code ABAQUS/Standard to calculate the maximum deflection of the 3DOWC during each loading cycle. The bending deformation at different loading cycles was also calculated. From the comparisons between FEA and experimental approaches, it is indicated that the proposed model is reasonable for calculating the fatigue bending deformation.     

Finite element analyses of compressive behaviors of biaxial warp-knitted composite material under various strain rates with a simplified geometrical model

This paper reports the compressive behaviors of biaxial warp-knitted (BWK) composite material under compression with various strain rates. The compression stress–strain curves and the failure modes along three orthogonal directions were obtained from split Hopkinson pressure bar (SHPB) apparatus. A finite element analysis (FEA) model based on a simplified model of BWK composite was also carried out to verify the experimental results. In the simplified model, an equivalence resin (ER) combined tricot yarns with resin, and the stiffness matrix was derived from the mechanical parameters of the tricot yarns and the resin. A good agreement between experimental and FEA demonstrates that the simplified method is applicable of modeling the high strain-rate behaviors. By comparing the experimental damage morphologies with the damage development and morphologies observed from the model, it was found that the FEA model offers a better understanding to the compression damage mechanisms. The model can also be extended to design the impact performance of the BWK composite with high efficiency.     

刮平定厚机金刚石滚筒支架的有限元分析

应用ANSYS大型通用有限元软件，利用支架的结构对称性，对陶瓷刮平定厚机的整体支架进行了刚性分析，分析结果表明，得出的工况下支架的结构应力、应变分布规律比传统的计算结果更精确，更详细。为加强支架的整体刚度，隔绝固体声对支架的激励而辐射噪声提供了重要的理论依据。     

Axial compressive deformation and damage of four-step 3-D circular braided composite tubes under various strain rates

This paper reports the axial compressive deformation and damage of three-dimensional (3-D) braided carbon/epoxy composite circular tubes under quasi-static and high strain rate loadings. Three kinds of 3-D circular braided composite tubes with different braiding angles of 25°, 35°, and 45° were tested under strain rates of 0.001/s, 330/s, 500/s, and 650/s. The stress–strain curves, deformation and damage of the braided tubes under axial compressions were obtained to analyze the compressive failure mechanisms and the influences of the braiding angles on the compressive behaviors. A finite element model based on the meso-structure of the braided preform and the braided composite was established to reveal the axial compressive deformation and damage mechanisms. The axial compressive behaviors were compared both in the finite element analyses (FEA) results and the tested data, and good agreements were found. From the FEA and experimental results, it was concluded that the compressions deformation, damage, and stress–strain curves are sensitive to the strain rate and the braided angles. The strain rate and braided angle are the key parameters for the design of the braided composite tubes with high compression strength.     

Large-scale finite element analysis of a 3D angle-interlock woven composite undergoing low-cyclic three-point bending fatigue

This paper reports the large-scale finite element analysis (FEA) of a 3D angle-interlock layer-to-layer woven composite material undergoing low-cyclic three-point bending fatigue at microstructure level. A microstructure geometrical model of the 3D woven composite material was established to model the real structure of the woven composite. The fatigue behaviors of the 3D woven composite undergoing three-point bending with sinusoidal wave-form were investigated from experimental and FEA approaches. Based on displacement-controlled bending and inelastic hysteresis energy fatigue damage criterion, the interior deformation, energy absorption, and stress distribution characteristics during the fatigue process were analyzed. The different failure mechanisms and damage patterns of yarns and resin were discussed. The influence of the 3D woven structure on the fatigue behaviors was discussed. The fatigue damage morphologies and stiffness degradation were obtained to compare with the experimental results. The results show that the most of energy was absorbed by warp yarns. Stress concentration was emerged on the inclined part of warp yarns and the interface between yarns and resin. The damage morphologies from experimental and FEA results are in good agreement. The stiffness degradation curves also show the same tendency.     

超声弯曲工具头的动态特性仿真与实验研究

牙种植超声工具利用弯曲工具头能够制备异型种植窝孔,为了研究工具头弯曲角度对位移响应的影响,利用有限元软件Abaqus对弯曲工具头进行动态仿真,得到不同弯曲角度工具头的位移响应,并通过实验验证有限元分析结果。验证实验表明,有限元分析结果与实验结果基本保持一致,为具有弯曲工具头的牙种植超声工具的设计提供了方法和依据。     

带降液管蒸发器管板的强度分析

提出了带降液管蒸发器管板的应力分析力学模型，介绍了有限元应用于应力求解的方法，并通过对ＴＢＺ１４００、ＴＢＺ１２００蒸发器管板的实验应力测试，验证有限元法的有效性     

香梨与瓦楞纸板跌落碰撞的接触应力分布分析及损伤预测

为了实现香梨果实跌落碰撞时损伤面积的准确评估和预测,本研究采用Prescale感压胶片对香梨与瓦楞纸板不同高度跌落碰撞下的接触应力分布进行测量分析,探讨接触应力分布与损伤面积的关系,确定了最接近损伤面积的应力面积范围。并在此基础上采用有限元模拟方法对香梨碰撞瓦楞纸板的损伤面积进行预测分析。研究结果表明,感压胶片测量的接触应力分布中0.20 MPa范围的应力面积与损伤面积最为接近,相对误差率平均为6.81%。当该应力范围应用于有限元模拟的损伤面积预测时,香梨损伤面积的预测值略高于实际损伤面积,损伤预测的相对误差率平均约为13.29%,显著提高了预测精度,实现了有限元法对香梨与瓦楞纸板跌落碰撞损伤面积的较准确地预测,为今后香梨机械化作业中减损设计提供了研究基础。