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针对烟气轮机叶片在固体催化剂颗粒下冲蚀磨损引起疲劳破坏的工程问题,运用有限元软件ANSYS/LSDYNA建立高温合金材料单颗粒冲蚀力学模型,进行了三维显示冲击动力学计算及冲蚀机理分析;研究了相同颗粒尺寸下不同冲蚀速度对靶材的冲蚀规律,及同一冲蚀速度时不同尺寸颗粒的冲蚀效果。结果表明,随着冲蚀速度增大,等效塑性应变值逐渐增大,颗粒对靶材的冲蚀深度和材料失效区体积也逐渐增加,当应变累积到一定程度时,材料发生冲蚀破坏。同一冲蚀速度下,最大等效应力和等效塑性应变幅值随颗粒增大逐渐增加,靶体材料被挤压的凹坑压痕逐渐加深,四周形成唇片;靶体表层的材料失效区发生横向和径向扩展。当应力值超过材料的屈服极限时就会产生裂纹,发生冲蚀破坏。
Aiming at the engineering problems of flue gas turbine blade blade erosion caused by erosion and erosion under the solid catalyst particles, the single particle erosion mechanical model of superalloy material was established by finite element software ANSYS / LSDYNA. The three-dimensional display of impact kinetics and erosion mechanism The erosion of target with different erosion rates under the same particle size and the erosion effects of different size particles at the same erosion velocity were studied. The results show that as the erosion rate increases, the equivalent plastic strain increases gradually, and the erosion depth of the target and the volume of the material failure zone increase gradually. When the strain accumulates to a certain extent, the erosion damage occurs to the material . At the same erosion rate, the maximum equivalent stress and equivalent plastic strain amplitude increase with the increase of particles, and the indentation of the target material is gradually deepened and the lip forms around. The material failure area of the target surface Horizontal and radial expansion occurs. When the stress exceeds the yield limit of the material will produce cracks, erosion damage occurred.