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《机械强度》2017,(3):674-678
帘线增强橡胶软管广泛应用于汽车、航空、航天等领域,满足力学性能是其安全使用的关键。首先对针织帘线的建模方法进行探讨,然后利用Ansys软件对针织芳纶帘线增强三元乙丙橡胶软管的力学性能进行分析,最后研究帘线针数对橡胶软管力学性能的影响。仿真结果表明,当胶管承受0.24 MPa内压时,帘线最大等效应力是胶管基体最大等效应力的三百多倍,胶管基体最大变形量是帘线最大变形量的数倍,并且胶管基体与帘线均不会发生破坏。胶管的实验爆破压力为2.04 MPa,是预测爆破压力2.10 MPa的0.97倍。随着帘线针数的增多,帘线和胶管基体上的等效应力和变形量均先急剧减小然后趋向平缓。 相似文献
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德国Saurer-Allma公司推出一种轮胎帘线用新型Multi Corder MC捻线机。该公司是服务于轮胎帘线工业最大的捻线机制造商之一。自从Cable Corder投放市场以来,已销售出1100多台,大致占全球轮胎帘线生产能力的40%。 相似文献
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为了满足全球对大胎和超大型越野子午线轮胎(0TR)的日益增长的需求,普利司通(Bridgestone)公司拟定计划扩大日本Kitakyushu工厂的生产能力。此外,该公司还将增加钢丝帘线的生产能力,用在Saga工厂内生产的大型与超大型越野轮胎上。 相似文献
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针对有两族帘线的橡胶—帘线增强复合材料,基于Spencer的连续介质力学不变量理论,提出了一种非线性超弹性本构模型。通过引入两个帘线排列方向的结构张量把单位体积的自由应变能分解为便于参数识别的体积变形、等容变形和各向异性变形三部分。分别用纯橡胶单轴拉伸实验,沿帘线方向单轴拉伸实验数据拟合得到等容变形和各向异性变形的材料参数。通过COMSOL弱形式偏微分方程,对橡胶-帘线增强复合材料在有限变形下的单轴拉伸进行数值模拟。预测了帘线在不同排列方向条件下的力学性能,为轮胎的力学分析打下了坚实的基础。 相似文献
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建立了11.00R20规格全钢载重子午线轮胎力学分析的二维有限元模型和与之匹配的三维钢丝圈有限元模型。运用ABAQUS软件对轮胎二维模型进行充气仿真分析获取钢丝圈的边界条件,进而加载至钢丝圈三维模型进行独立仿真。结果表明,螺旋缠绕式圆形钢丝圈与矩形钢丝圈和六角形钢丝圈结构相比应力分布更均匀,钢丝最大应力分别降低9.2%、12%,从而提高了该型号轮胎的整体性能。 相似文献
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汽车空气弹簧橡胶气囊的结构分析方法 总被引:3,自引:1,他引:3
为研究一套汽车空气弹簧橡胶气囊的结构分析方法,对橡胶气囊几何模型进行了简化,进而以薄膜理论、网格理论以及层合板理论为理论依据,推导出橡胶气囊薄膜内力、应力、应变、帘线力和变形位移等计算公式。为橡胶气囊的结构分析和强度校核奠定了理论基础。为检验所提出的结构分析方法的精确度和有效性, 以一汽车悬架用空气弹簧为实例,计算其变形和帘线力。为了进行比较,还对该空气弹簧结构建立了三维有限元模型,并用非线性有限元软件ABAQUS进行有限元数值分析。这两种方法的计算结果综合比较表明,所提出的结构分析方法不仅预测结果精确,而且大大节省计算量。 相似文献
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高精度矫直辊辊型设计及工艺参数控制是二辊矫直机的核心技术。为了满足高精度棒材矫直要求,在辊型设计过程中依据矫直辊磨损状态、弹塑性理论、塑性变形硬化系数求解模型及中性层偏移理论,提出“凹三凸二”分段辊型的矫直辊组合形式及辊型设计方法。在此基础上,根据棒材与矫直辊的局部线接触状态,建立棒材二辊矫直倾角及辊缝估算模型,进而探讨二辊矫直工艺参数(倾角、辊缝、矫直速度和导板间距)的变化规律和控制策略,并给出具体设计实例和有限元模拟分析。从矫直力、塑性变形深度、直线度及残余应力等角度,证明该辊型设计方法和工艺控制策略的有效性,且现场试验矫后的棒材直线度小于1 mm/m,完全满足棒材高精度矫直标准。 相似文献
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某骨架式方舱的计算与测试分析 总被引:1,自引:1,他引:1
以某雷达方舱骨架结构为研究对象.在设计阶段,对骨架模型用有限元方法进行了强度分析,根据分析的结果,对骨架的设计进行了改进;最后,骨架用高强度钢焊接而成.为验证计算的准确性,对骨架实物进行了应力测试,通过对计算和测试结果的分析,设计得骨架符合要求,同时为骨架的优化设计提供了有利的数据. 相似文献
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G. KHODABAKHSHI D. WALKER A. SCUTT L. WAY R.M. COWIE D.R. HOSE 《Journal of microscopy》2013,249(3):195-205
Tendons are tough fibrous tissues that facilitate skeletal movement by transferring muscular force to bone. Studies into the effects of mechanical stress on tendons have shown that these can either accelerate healing or cause tendon injuries depending on the load applied. It is known that local strain magnitude and direction play an important role in tendon remodelling and also failure, and different techniques to study strain distribution have been proposed. Image registration and processing techniques are among the recently employed methods. In this study, a novel three‐dimensional image processing technique using the Sheffield Image Registration Toolkit is introduced to study local strain and displacement distribution in tendon. The results show that the local normal strain values in the loading axis are smaller than the global applied load, and fibre sliding was detected as a dominant mechanism for transferring the applied load within tendon. However, results from different samples suggest three distinct modes of deformation during loading, as some show only parallel sliding of fibres in respect to the loading axis, whereas others are twisted or deflected in directions transverse to the loading axis. The proposed 3D image registration method is essential for analysing this out‐of‐plane movement, which cannot be detected using a standard 2D method. 相似文献
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Harkali Setiyono 《International Journal of Mechanical Sciences》2008,50(8):1280-1291
An analytical method of combined plastic mechanism and elastic approaches has been developed to predict the moment capacity of a thin-walled channel steel section beam. The plastic mechanism approach is performed by analyzing an idealized model of bending-plastic-hinge-collapse mechanism of the beam bent about its minor neutral axis. This approach adopts a concept of the equilibrium between external energy and the one dissipating in the hinge mechanism. Another analytical approach has been done by analyzing the investigated beam according to an elastic-bending theory. In the elastic analysis, the application of an effective width concept has also been considered to account for the effect of local buckling on the bending element of the beam. These both analytical approaches are then used in the method of cut-off strength to estimate a theoretical moment capacity of the beam bent about its minor neutral axis. An attempt has also been carried out to correlate the estimated moment capacity obtained to another one about a major neutral axis. In order to assess the accuracy of the analytical method developed, its predicted results are verified using the data obtained from experiments and a design code specially used for cold-formed steel structural members. The data of moment capacity about the minor neutral axis is compared to the one measured in a number of flexural-bending tests to failure on the similar channel steel section beams. Meanwhile, the data of moment capacity about the major neutral axis is compared to the one calculated using the design code. A statistical analysis of verified data populations indicates that the mean value of deviated data from experimental one is 1.025 with the standard deviation of 0.087 and from the design code is 1.004 with the standard deviation of 0.111. These statistical measures clearly mean that the analytical model presented herein, on average, tends to estimate conservatively the moment capacity of the investigated beam about its both unsymmetrical and symmetrical-neutral axes by less than 5% and this is certainly still within acceptable limits of ±20%. 相似文献
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分析热动态伪滞后效应对直接进给轴驱动精度的影响,对进给轴具有的热伪动态特性进行建模和误差补偿研究。依据一维热传导和一维热膨胀理论,推导直线电机驱动进给轴热动态过程的温度分布模型和热变形误差动态模型,通过有限元分析方法和试验相结合,构建基于关键温度点的直接进给轴热伪滞后变形动态识别模型。应用激光干涉仪测量直接进给轴的热变形量,采用温度传感器和红外测温仪测量直接进给轴关键点的温度,构建进给轴动态热变形补偿系统,依据实时温度对应的热变形数据,发送热变形预测值给运动控制卡,进而向伺服控制器发送控制补偿指令,通过对直接进给轴的运动叠加控制,实现对直接进给轴的热变形补偿。在自构建的直接进给轴试验台上进行试验研究,结果表明:动态识别模型能有效的预测动态热行为,通过构建热变形补偿系统,可使直接进给轴进给精度提高75%。 相似文献
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利用钢丝绳绳芯输送带接头搭接部分的灰度关系,采用差分算法对接头图片进行阈值分割。根据接头的边沿关系,去除了冗余信息,然后利用并查集算法进行连通域合并检出每条线。该算法利用树型数据结构避免了常用的二次扫描算法的重复遍历。实验表明用这种方法能够方便计算出接头距离。 相似文献
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针对超高强度钢冷塑性变形能力弱、表面形变强化难度大的问题,提出热场-超声复合滚压强化方法。开展45CrNiMoVA钢表面热场-超声复合滚压试验,利用SEM、EBSD和TEM等检测手段,结合表面层残余应力分布结果,表征、分析表层微观组织的演变与强化机制。发现在声软化效应和热软化效应耦合作用下,热场-超声复合滚压后45CrNiMoVA钢表层材料的塑性变形程度加剧,塑性变形层深度增加,表层材料发生晶粒细化,形成沿深度方向晶粒尺寸呈梯度分布的微观组织结构,细晶强化和位错强化是主要的强化机制。证明了热场-超声复合滚压方法的有效性,对超高强度钢零件表面强化处理技术的发展具有重要意义。 相似文献