Flow-induced vibration of the tube bundles in two-phase flow involves complicated interactions between the fluids and structures. Although a substantial number of studies have been devoted to investigating the flow-induced vibration and fluidelastic instability of the tube bundles subjected to two-phase cross-flow, the fatigue damage features of the tubes are not fully understood. In this paper, considering the effects of the turbulence random forces and the fluidelastic forces, a mathematical model of the tube bundles subjected to two-phase flow and the clearance restriction was developed. The vibration responses of the tube bundles within five void fraction conditions were calculated. The flow-induced vibration fatigue damages of the tubes were estimated based on S-N curves. The effects of the clearance restriction, the flow pitch velocity, and the void fraction of the two-phase flow on the fatigue damage were discussed. The numerical results demonstrate that the void fraction and flow pitch velocity of the two-phase flow have a significant influence on the fatigue damage of the tube bundles. And, the clearance restriction can change the location of the maximum fatigue damage.

两相流中管束的流动引起的振动涉及流体和结构之间的复杂相互作用。尽管已经有大量研究致力于研究管束在两相错流作用下的流动引起的振动和流体弹性不稳定性，但对管的疲劳损伤特征还没有完全了解。在本文中，考虑湍流随机力和流体弹性力的影响，建立了管束受两相流和间隙限制的数学模型。计算了管束在五种空隙率条件下的振动响应。基于S - N估计管子的流动振动疲劳损伤曲线。讨论了间隙限制、流动节距速度和两相流的空隙率对疲劳损伤的影响。数值结果表明，两相流的空隙率和流动节距速度对管束的疲劳损伤有显着影响。并且，间隙限制可以改变最大疲劳损伤的位置。