在工程实践中，核电一回路管道处于内压、弯矩、流体冲击等动态载荷作用下，管道会由于流体波动、机械振动等原因导致振动，进而影响核电一回路管道裂纹的力学参量。为了了解振动作用对核电一回路管道裂纹力学参量的影响，本论文以AP1000核电一回路弯管为研究对象，运用ANSYS Workbench在振动作用下对AP1000核电一回路管道所存在裂纹的力学参量进行分析。主要研究内容如下： (1)以AP1000核电一回路热段管道为研究对象，对管道处于静力载荷作用下，不同管道固定方式下的不同位置的裂纹力学参量应力强度因子K、裂纹前缘Mises应力和拉伸应力进行分析，得到静力作用下裂纹力学参量。 (2)对不同固定方式下的管道进行了干模态分析，得到其一阶固有频率。并考虑内压或弯矩变化导致的管道共振作用，得到管道不同固定方式下不同位置的裂纹的力学参量。通过与静态裂纹力学参量计算比较，得到管道振动作用对管道不同类型的表面裂纹力学参量的影响。 (3)考虑充液管道流固耦合作用，在流体流速恒定下得到管道裂纹力学参量，并与静态裂纹力学参量计算比较，得到流体作用对管道不同固定方式下不同位置的表面裂纹力学参量的影响。 (4)考虑流固耦合作用，对不同固定方式下的充液管道进行湿模态分析，得到其一阶固有频率。考虑流体导致的管道振动作用，得到阀门关闭工况下水击现象对管道裂纹力学参量的影响，并对流体流速简谐变化导致的管道共振工况下的裂纹最深点力学参量的变化进行了分析。

In engineering practice, the primary pipeline of nuclear power is under the action of internal pressure, bending moment and fluid impact. The pipeline will be caused the vibration due to fluid fluctuation, mechanical vibration and so on. Furthermore, the mechanical parameters of the cracks are affected as well. In order to acknowledge the effect of vibration on the mechanical parameters of the cracks in the nuclear power primary pipeline. In this thesis, the primary pipeline of AP1000 nuclear power were taken as the research object, and the mechanical parameters of the cracks in the primary pipeline of AP1000 nuclear power were analyzed under vibration using ANSYS Workbench. (1) Taking the primary pipeline of AP1000 nuclear power as the research object, the stress intensity factor K, the crack front edge Mises stress and the tensile stress of the cracks at different positions under different pipe fixed modes are analyzed under static load, and the cracks mechanical parameters under static action were obtained. (2) The dry mode analysis of the pipes under different fixed modes was carried out to obtain the first order inherent frequency. The pipeline resonate effect due to internal pressure or bending moments, the mechanical parameters of the cracks on different positions of the pipeline were obtained. By comparing with the mechanical parameters of static cracks, the influence of pipeline vibration on the mechanical parameters of different types of surface cracks were obtained. (3) The mechanical parameters of the pipeline cracks were obtained under the constant flow velocity of the fluid in consideration of the fluid-solid coupling of the liquid-filled pipeline. And the influence of the fluid action on the surface cracks mechanical parameters on different positions under different fixed ways was obtained. (4) Considering the effect of fluid-solid coupling, the wet-mode analysis of the liquid-filled pipeline under different fixed modes was carried out, and the first-order inherent frequency was obtained. Considering the effect of pipe vibration caused by fluid, the influence of water hammer phenomenon on the mechanical parameters of pipeline cracks was obtained. And the variation of the mechanical parameters of the deepest point under the resonance condition of the pipeline caused by the simple harmonic change of the fluid flow rate was analyzed.