To show the distribution of a temperature field on a steel disk and to prolong the service life of a friction pair in a Hy-dro-Viscous Drive (HVD) device, a theoretical model of a transient temperature field was estab...To show the distribution of a temperature field on a steel disk and to prolong the service life of a friction pair in a Hy-dro-Viscous Drive (HVD) device, a theoretical model of a transient temperature field was established, based on the theory of heat conduction. This theoretical model was solved using a finite element method. The results show that the surface temperature of the steel disk does not increase consistently as a function of the radius; the highest temperature appears short of the maximum radius. The relationship between the surface temperature and the mixed friction time is exponential. With a friction time of 15 s, the tem-perature reached 465.9 °C. Simultaneously, the internal thermal stress is larger than the yield stress of the material, causing a warping deformation of the steel disk. The largest axial deformation is 0.32 mm. The results of the experiment suggest that the de-formation is the same as that obtained from numerical simulation. Therefore, deformation of the steel disk must be considered dur-ing the study of the characteristics of a HVD.展开更多
基金support for this work by the NationalNatural Science Foundation of China (No50975275)
文摘To show the distribution of a temperature field on a steel disk and to prolong the service life of a friction pair in a Hy-dro-Viscous Drive (HVD) device, a theoretical model of a transient temperature field was established, based on the theory of heat conduction. This theoretical model was solved using a finite element method. The results show that the surface temperature of the steel disk does not increase consistently as a function of the radius; the highest temperature appears short of the maximum radius. The relationship between the surface temperature and the mixed friction time is exponential. With a friction time of 15 s, the tem-perature reached 465.9 °C. Simultaneously, the internal thermal stress is larger than the yield stress of the material, causing a warping deformation of the steel disk. The largest axial deformation is 0.32 mm. The results of the experiment suggest that the de-formation is the same as that obtained from numerical simulation. Therefore, deformation of the steel disk must be considered dur-ing the study of the characteristics of a HVD.
文摘针对轮扣式脚手架节点使用中存在的问题,提出了一种新型的轮扣式脚手架节点。并对轮盘名义厚度分别为8,10 mm的两批次共25个节点进行了转动刚度试验。试验结果表明:轮扣式钢管脚手架节点具有典型的半刚性连接特性,轮盘厚度为10 mm的节点其转动刚度可达32. 52 k N·m/rad,高于相关规范的24 k N·m/rad限值,也明显高于8 mm厚轮盘的节点转动刚度。基于有限元分析软件ABAQUS建立了数值分析模型并与节点试验进行了对比。发现数值分析得到的转动刚度要略高于试验值,但除了直插头插入大口时的误差相对较大外,直插头插入标准口和小口时数值分析得到的转动刚度和试验结果吻合程度较好。
