Results 11 to 20 of about 60 (56)
Vibration testing and safety assessment of compressor outlet piping for compressor station [PDF]
Objective The oil and gas industry has gradually integrated the safety monitoring of piping vibration under service conditions into the standard management system.
Chen SHANG +4 more
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Study on Ultrasonic Nondestructive Evaluation Method and Mechanism of Stress [PDF]
, 2017 随着科技的发展与进步，机械设备运行条件日益苛刻，关键零部件的失效已成为导致机械整体快速失效的主要原因之一。而应力是机械零部件性能降低和使其发生屈服或断裂的主要原因，因此为保证机械设备服役状态，需对机械零部件应力进行评价。 针对目前应力评价方法局限性的难题，本文以声弹性原理为基础，以实现应力的方便、快速、适于现场检测等的无损评价方法研究为目标，研究钢材应力的超声波评价方法及机制。优化应力评价的超声波信号特征参量，基于数值方法分析计算长度、信号幅值及信号的信噪比与特征参量间响应关系；结合力学静载拉伸试验 ...
阙小颖
core
Failure behavior analysis of high stiffener web height I-girders of cruise ships considering initial welding defects [PDF]
ObjectiveHigh stiffener web height I-girders on large cruise ships are made of thin welded plates, which lead to noticeable weld distortion and stresses during manufacturing, and can affect the load-bearing characteristics of the structure. Therefore, in
Chen CHEN +4 more
core +1 more source
Computer-aided Numerical Analysis of the Arc Welding Process for the Pole-structure [PDF]
, 2006 由于焊接技术在工业中的应用日益广泛，对焊件质量的要求也越来越高，杆件的焊接加工量很大，但存在诸多技术问题亟待解决。在焊接的实测研究在技术上仍存在较大难度的情况下，数值分析模拟不失为一种可取的研究手段。针对当前对杆件焊接的数值模拟还比较少，本文对以A3钢为材料的杆件对接焊过程进行了有限元仿真。本文采用大型通用有限元分析软件ANSYS，用参数化命令流方式编程，对焊接模型进行实体建模，并通过网格控制对其进行不均匀网格划分以形成合理的有限元网格模型。由于高温时材料属性参数的数据较为欠缺 ...
戴倩
core
Research on Smith's method of hull girder ultimate strength based on elastic shakedown limit state [PDF]
ObjectiveTo accurately assess the ultimate strength of a hull girder, this study analyzes the elastic shakedown characteristics of hull stiffeners under cyclic loading.
Huwei CUI +3 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2021 风电机组大型化逐渐成为我国中东部、南部等低风速区风电塔的发展趋势。单机容量大型化带来的机头极限荷载和疲劳荷载的提升,给传统风电单管式钢塔筒支撑结构的设计、制造和运输带来了巨大挑战。为解决此问题,提出了一种构架式预应力抗疲劳钢管风电塔,在降低支撑结构用钢量、提升结构刚度避免共振的同时,通过在塔柱钢管内张拉预应力钢绞线的方式,降低塔柱焊接节点所受疲劳外荷载应力幅的平均应力,从而延长其疲劳寿命,并改善疲劳脆性破坏特性。基于上述预应力抗疲劳构架塔概念,通过整理总结相关规范和标准的规定以及文献研究结论 ...
罗宇骁, 马人乐, 裘科一
doaj
Relaxation Behavior of Residual Stress on Deck-to-Rib Welded Joints by Fatigue Loading in an Orthotropic Bridge Deck [PDF]
, 2019 To accurately evaluate the influence of the actual tension and compression state and stress ratio at the deck-to-rib welding seam position on the fatigue life of a bridge deck, this paper establishes a coupled stress analysis model that considers the ...
Ding, You-liang +3 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2014 通过对某工程项目一榀2根屈曲约束支撑连接焊接过程产生的焊接残余应力、位移以及温度进行现场监测和有限元分析,得到屈曲约束支撑在不同的焊接连接方法过程中产生的残余应力和变形数据,两种焊接方法焊接时对支撑远端连接部位产生的最大拉应力分别为24MPa、2MPa,最大压应力分别为2MPa、6MPa;最大竖向位移为0.51mm,和有限元模拟计算产生的最大竖向位移0.70mm基本吻合,可以看到第二种焊接顺序更为合理。为分析焊接残余应力以及焊接变形对屈曲约束支撑性能的影响 ...
吴志平 +4 more
doaj
Theoretical calculation method of hyperbolic rotating thin shell bending problem [PDF]
ObjectiveIn order to analyze the bending characteristics of a hyperbolic rotating thin shell, the complex two-dimensional mechanical problem is simplified into a one-dimensional bending problem based on Euler's Bernoulli beam theory.
Cong LIU +4 more
core +1 more source
Shiyou jixie, 2015 根据铺管时的实际工况，建立了深水钢悬链线立管的焊接有限元模型，采用双椭球热源模型模拟焊接中的移动热源，运用Fortan语言对模型进行汇编，并运用DFLUX子程序进行ABAQUS的二次开发。在仿真中运用单元生死技术来模拟焊料单元的焊接参与情况，分别选取不同的焊接参数进行焊接模拟，利用控制变量法进行立管焊接残余热应力及其影响因素研究。研究结果表明，立管焊缝处单位体积的热输入量以及单位体积的受热时间是影响残余应力场的主要因素；立管的几何参数在影响焊接残余应力场的同时也影响残余应力场应力较高区域 ...
庹, 鑫, 段梦兰, 范, 晓, 刘秉奇
doaj