• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on Advanced Design and Manufacture(ADM2006); 20060108-10; Harbin(CN) >CONNECTION STRENGTH AND TIGHTNESS OF HYDRAULICALLY EXPANDED TUBE- TO-TUBESHEET JOINTS
【24h】

CONNECTION STRENGTH AND TIGHTNESS OF HYDRAULICALLY EXPANDED TUBE- TO-TUBESHEET JOINTS

机译：液压膨胀管对管接头的连接强度和紧密度

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Many investigations and practical experience show that most heat exchanger failures occur at the tube-to-tubesheet joints and that they are affected by the geometry of the tube and tubesheet, the manufacturing process and the operating conditions. This paper focuses on the effect of the expansion pressure and operating temperature on the connection capacity of hydraulically expanded joints. Incorporating widely used materials (low carbon steel for the tube and low alloy steel for the tubesheet), the finite element method (FEM) was used to simulate the expansion process and study the connection capacity of the expanded joints. The occurrence and loss of contact between the tube and tubesheet were modeled using contact elements. Furthermore, the effect of a cyclic change in temperature on the connection capacity of hydraulically expanded tube-to-tubesheet joints was investigated. In order to confirm the credibility of the finite element models employed in this study, some specimens were fabricated and joint strength experiments were performed using a MTS 880 testing machine by straining the joints at a set rate while recording the loads. The latter were found to be in good agreement with the FEM calculated values. The results of this study show that the connection capacity of joints can be greatly enhanced by expansion pressure increments, improved at the beginning and lowered gradually with an increase in the temperature. The connection capacity is a reduced very little after the first temperature cycle and remains almost unchanged after the second and third cycles. The study also shows that the FEM is a viable method to predict leakage behavior.
机译：许多研究和实践经验表明，大多数热交换器故障都发生在管对管板的连接处，并且受管和管板的几何形状，制造工艺和操作条件的影响。本文重点研究膨胀压力和工作温度对液压膨胀节连接能力的影响。结合广泛使用的材料（用于管的低碳钢和用于管板的低合金钢），使用有限元方法（FEM）来模拟膨胀过程并研究膨胀接头的连接能力。管与管板之间接触的发生和损失使用接触元件进行建模。此外，研究了温度的周期性变化对水力膨胀管对管板接头的连接能力的影响。为了确认本研究中使用的有限元模型的可信度，制造了一些样品，并使用MTS 880测试机通过在设定载荷的同时以设定的速率拉伸接缝来进行接缝强度实验。发现后者与FEM计算值非常吻合。这项研究的结果表明，随着温度的升高，膨胀压力的增加可以极大地提高接头的连接能力，在开始时可以改善接头，然后逐渐降低。在第一个温度循环后，连接容量几乎没有减少，而在第二个和第三个循环后，连接容量几乎保持不变。研究还表明，有限元法是预测泄漏行为的可行方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号