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缠绕管灵敏度的特点以及产生裂纹的原因!

作者: admin    来源:http://www.laobingguandao.com  时间:2020-03-11    人气:
  与普通管材相比,hdpe空心管材在环境中的缠绕程度不一样,除了工作温度、压力、介质外,还会产生较大的变形。hdpe空心缠绕管的位移通过变形来补偿管道的位移。这种位移导致中空hdpe缠绕管的轴向应力和弯曲应力较高,裂缝主要为横向裂缝,也有一些与横向裂缝成一定角度的斜向裂缝。在许多情况下,hdpe中空壁缠绕管也会受到机械振动和振动引起的管道介质的流动,同时,管道的自重,媒介,绝缘材料会造成一定弯矩的hdpe中空壁缠绕管,所以hdpe中空壁缠绕管的工作应力状态是非常复杂的。
  Compared with ordinary pipes, the winding degree of HDPE hollow pipes in the environment is not the same, in addition to the working temperature, pressure, medium, there will be greater deformation. The displacement of HDPE hollow winding pipe is compensated by deformation. This kind of displacement leads to high axial and bending stress of the hollow HDPE winding pipe. The cracks are mainly transverse cracks, and there are also some oblique cracks with a certain angle with the transverse cracks. In many cases, HDPE hollow wall wound pipe will also be subject to mechanical vibration and vibration caused by the flow of pipe medium. At the same time, the dead weight of the pipe, medium, insulation materials will cause a certain bending moment of HDPE hollow wall wound pipe, so the working stress state of HDPE hollow wall wound pipe is very complex.
  因此,晶间腐蚀产生的微裂纹是裂纹的来源,在应力的作用下,微裂纹的扩展导致应力腐蚀裂纹的形成。此外,hdpe空心壁缠绕管结构的晶粒尺寸较大,对材料性能产生不利影响,晶界强度也急剧下降。因此,在应力和腐蚀介质的共同作用下,晶粒尺寸会增大晶粒间腐蚀倾向,加速裂纹的扩展。
  Therefore, microcracks produced by intergranular corrosion are the source of cracks. Under the action of stress, the growth of microcracks leads to the formation of stress corrosion cracks. In addition, the grain size of HDPE hollow wall winding tube structure is large, which has a negative impact on the material properties, and the grain boundary strength also drops sharply. Therefore, under the joint action of stress and corrosion medium, the grain size will increase the tendency of intergranular corrosion and accelerate the crack growth.
pvc-u螺旋缠绕管
  hdpe空心外肋缠绕管的壁厚变化小于液压成型波纹管。因此,空心外肋hdpe螺旋缠绕管的弥散度要大于空心外肋hdpe螺旋缠绕焊接管的弥散度。如果hdpe空心外肋螺旋缠绕管的特性偏差与液压波纹管相同,则hdpe空心外肋螺旋缠绕管的成品率更高(从特性上看)。hdpe空心外肋螺旋缠绕管在成型过程中材料的塑性变形小于重压波纹管,因此焊接波纹管的材料类型多于液压波纹管。
  The wall thickness change of HDPE hollow outer rib winding pipe is smaller than that of the hydraulic forming bellows. Therefore, the dispersion of hollow outer rib HDPE spiral wound pipe is greater than that of hollow outer rib HDPE spiral wound welded pipe. If the characteristic deviation of HDPE hollow outer rib spiral wound pipe is the same as that of hydraulic bellows, the yield of HDPE hollow outer rib spiral wound pipe is higher (from the aspect of characteristics). In the process of forming, the plastic deformation of HDPE hollow outer rib spiral wound pipe is less than that of heavy pressure bellows, so the material type of welded bellows is more than that of hydraulic bellows.
  hdpe空心外肋螺旋缠绕管具有更多的波纹形状,与集中压力波纹管相比,更容易调整和控制其特性。Hdpe空心外肋螺旋缠绕管也可以实现更精确的形状和尺寸,因此,Hdpe空心外肋螺旋缠绕管方便达到预期的设计有效面积。hdpe空心外肋螺旋缠绕管的强度、疲劳寿命和迟滞特性均优于液压波纹管。hdpe空心外肋螺旋缠绕管的制造需要特殊的焊接设备和精湛的工艺,因此制造hdpe空心外肋螺旋缠绕管的成本要高于液压波纹管。
  Compared with the concentrated pressure bellows, HDPE hollow outer rib spiral wound pipes have more corrugated shapes, which are easier to adjust and control their characteristics. HDPE hollow outer rib spiral wound pipe can also achieve more accurate shape and size, so it is convenient to achieve the expected design effective area. The strength, fatigue life and hysteresis characteristics of HDPE hollow outer rib spiral wound pipe are better than those of hydraulic bellows. The manufacturing of HDPE hollow outer rib spiral wound pipe needs special welding equipment and exquisite technology, so the cost of manufacturing HDPE hollow outer rib spiral wound pipe is higher than that of hydraulic bellows.

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