共查询到19条相似文献,搜索用时 93 毫秒
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钢丝或钢带缠绕予以应力高压容器或模具由芯筒和缠绕层两部分组成。缠绕层采用等剪应力方法充分利用了钢丝的强度,比采用等张或等切应力方法能承载更大的工作内压。芯筒多采用高强材料。为使芯筒不易开裂并提高疲劳寿命,要求在工作内压载荷下内壁不出现拉应力。本文提出满足这一要求的最佳设计方法和计算公式。 相似文献
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应用材料力学的基本理论,对四列短圆柱滚子轴承内圈的受力作了定量分析,认为:轧机轴承在工作过程中内圈的受力以轴承负荷分配到内圈的应力和内圈与轴过盈配合产生的应力为主.摩擦力、旋转离心力可忽略不计.从对套圈产生破坏作用的角度出发,外壁应力大于内壁应力,因此套圈破坏始于外壁.附图5幅,参考文献2篇. 相似文献
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带挡边关节轴承静力学有限元分析 总被引:1,自引:0,他引:1
为研究KF11028型外圈带挡边的向心关节轴承的静力学特性,用Solidworks建立轴承三维模型,基于ANSYS Workbench对轴承在正常和偏斜2种工况下承受1 575 kN径向载荷的静力学特性进行有限元分析。分析结果表明:正常工况下,内圈等效应力最大值出现在油孔处,外圈的等效应力最大值出现在内球面边缘,均小于屈服强度,接触应力最大值出现在接触面边缘;偏斜工况下,内圈等效应力最大值出现在油孔处,外圈等效应力最大值出现在内球面位于挡边一侧的边缘处,均大于屈服强度,接触应力最大值出现在接触面边缘;内圈的偏斜会导致关节轴承受力不均匀,从而造成部分部位产生应力集中。因此带挡边向心关节轴承不宜长期工作在载荷和偏斜角度都比较大的工况下。 相似文献
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采用自行搭建的管道内壁残余应力测试平台,通过切割法测得核电蒸汽发生器传热管/管板接头传热管内壁的焊接残余应力,结合有限元模拟,研究了传热管内壁焊接残余应力的分布规律。结果表明:试验测得传热管/管板接头中传热管内壁近焊缝处的轴向和周向残余应力均为拉应力,随着距焊缝中心线距离的增加,残余拉应力减小并变为压应力,在距离焊缝中心线12mm处,残余压应力最大,在距离焊缝中心线21mm处残余应力减小至焊前初始应力;传热管内壁焊接残余应力分布的模拟结果和试验结果基本吻合,该有限元模型可以准确模拟核电蒸汽发生器传热管/管板接头传热管内壁焊接残余应力的分布规律。 相似文献
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J. Yoon J. Kim H. Kim C. Won Y. Song S. H. Park 《Journal of Mechanical Science and Technology》2017,31(9):4183-4188
Since Zirconium (Zr) alloys have been widely used as cladding material in a nuclear fuel rod, material properties of Zr are essential in prediction of failure and undesirable deformation. This paper mainly concerns calibration procedure to obtain the hoop stress of Zircaloy-4 tube with a simple ring tensile (RTT) test linking with a Digital image correlation (DIC) technique since it is substantially difficult to obtain, directly, with specialized experiment such as burst test with internal pressure. The uniaxial tensile tests along the axial and RTT along the hoop directions were conducted with Zircaloy-4 tube in which anisotropic stains were analyzed with a DIC technique to validate appropriate deformation history. Anisotropic yield criterion based on the measured R-values (R θ = 1.88 and R z = 0.814) is able to capture the precise deformation mode in the ring tensile test. The flow curve along the hoop direction is calibrated by converting F, G, and H material parameters based on the R-values to the function of stress ratios. 相似文献
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H Fessler D C Fricker 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》1989,203(1):15-34
Three-dimensional, frozen-stress photoelasticity was used to study the best shape for a proposed alumina universal head loaded on to a Vitallium cone taper spigot with a 30 degrees inclined force, as in vivo. Typical cone taper friction values were reproduced in the photoelastic models. The location of the highest tensile stresses in the Mark I shape with a flat crown was found to be on the inner surface of the crown. Changing to a torispherical surface in the Mark II shape reduced this magnitude. However, the Mark III shape with a hemispherical inner crown surface gave even lower stress there, equal to the maximum value of the hoop stress at the taper, which was measured to be fairly uniform both around and along the taper except at the ends where contact pressure concentrations were found to occur and it became reduced. Lamé axisymmetric cylinder stress predictions were found to be useful approximations to measured values and were generally overestimates of the tensile hoop stress at the head taper surface. 相似文献
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Junxue Ren Xiaoguang Zhang Jingxian Yang Chao Wang Yu Liu Wei Yang 《Journal of Mechanical Science and Technology》2014,28(9):3637-3643
The structural characteristics of a miniature tactical motor flexible joint subjected to pressure and vector loading were investigated using finite element analysis and bench test. Three-dimensional non-linear finite element analysis was conducted using ANSYS Code Version 11.0. The axial deflection, vectoring torque, and stress distributions in elastomeric and reinforcement rings were presented. The predicted values were consistent with the test data. Results indicate that the axial compressive stiffness increased gradually and nonlinearly with pressure, while the angular stiffness remained nearly constant in the vectoring angle range from 0° to 6°. Under pressure loading, the elastomeric shear stress was negative, high at both sides, and low at the center of the cross-section, while the reinforcement hoop stress was compressive at the inner radius and tensile at the outer radius. The compressive stress was also high. The flexible joint exhibited higher stress level with altered stress distribution when subjected to additional vector loading. Existing empirical formulas for reinforcement hoop compressive stress were determined to be not applicable to the miniature flexible joint, which significantly overestimated the stress caused by pressure and underestimated the stress caused by vectoring. 相似文献
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三通接箍是工业管道中的上常用结构,用来在主管道上接出分支.研究的三通接箍为采油地面设备使用,由于现场发现接箍位置经常发生管道破漏的情况,希望通过力学计算分析,找出原因,并改进设计.所采用的具体方法是:通过CATIA软件建立结构的三维模型,通过ABAQUS软件计算结构承受内压时的应力分布.通过这些有限元分析,计算结构的应... 相似文献
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热棘轮失效是薄壁圆筒的主要失效模式之一,现有ASME锅炉及压力容器规范和EN13445等设计标准主要考虑环向应力,而未考虑轴向应力条件,使得设计结果可能偏于不安全。针对循环热-机械双轴载荷下薄壁圆筒热棘轮设计理论的不足,采用非循环分析方法系统研究双轴应力状态下薄壁圆筒热棘轮极限的解析解,重点考虑轴向压缩应力对循环温度梯度和稳定内压组合载荷下薄壁圆筒热棘轮极限的影响,并提出相应的设计方法,并采用有限元法对理论结果进行验证。结果表明,循环热-机械载荷下轴向压缩应力会显著降低薄壁圆筒的热棘轮极限,且理论解与有限元分析结果吻合良好,这说明此方法可用于循环热-机械双轴载荷及类似工况下薄壁圆筒的热棘轮设计限,具有良好的工程价值。 相似文献
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含环向减薄缺陷主蒸汽管道蠕变应力变化规律研究 总被引:1,自引:0,他引:1
厚壁耐热钢广泛应用于高温电厂的主蒸汽管道。局部减薄缺陷是高温压力管道常见的体积型缺陷,局部减薄缺陷的存在对高温环境下运行的管道应力重分布会产生较大的影响,降低管道的承载能力。采用大型有限元分析软件ABAQUS对在蠕变条件下运行、受内压作用含环向减薄缺陷主蒸汽管的蠕变应力进行了有限元数值模拟,获得了应力重分布的变化过程。结果表明,含环向减薄缺陷直管,由于存在结构不连续,导致应力水平提高。在高温环境下,应力最大位置和应力集中系数最大位置可能会随蠕变时间的变化而改变,给出了含环向减薄管道应该主要关注的位置。研究结果可为高温含环向减薄缺陷管道的安全评定和完整性分析提供依据。 相似文献
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基于大型通用有限元软件ANSYS,对发生疲劳断裂的超高压管式反应器的端部结构进行数值模拟,分析了其在过盈套合、自增强处理以及服役期间开停工循环载荷三种工况下的局部应力场.结果表明:三种工况下,端部结构在过盈套合边缘局部范围内均存在较高的轴向拉应力,且大于环向应力;局部轴向应力随套合过盈量和自增强压力的增加而增大;半径过盈量为0.05 mm时,开停工循环载荷下的局部轴向平均应力最大值可达86.71 MPa,轴向交变应力幅值最大值达到62.2 MPa,裂纹垂直于轴向扩展的推动力较大.模拟分析结果对端部结构失效破坏原因的分析及其设计改进有一定的指导意义. 相似文献