烟气轮机叶片高温合金材料冲蚀磨损行为的数值模拟  

Numerical study on the erosion and abrasion behavior of the high temperature alloy material of flue gas turbine blade

作　　者：董晓慧[1] 张洪伟[1] 蔡晓君[1] 王磊[2] 

机构地区：[1]北京石油化工学院,北京102617 [2]北京化工大学,北京100029

出　　处：《塑性工程学报》2014年第3期122-127,共6页Journal of Plasticity Engineering

基　　金：北京教委科技计划面上资助项目(KKM201210017005)

摘　　要：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。For the fatigue fracture of flue gas turbine blade caused by the erosion and abrasion of the solid catalyst particles , a sin-gle particle erosion model was established ,which was used by the finite element software ANSYS/LS-DYNA .The three-dimen-sional explicit dynamic calculation and the erosion mechanism were conducted . The erosion rule on the target material with the same particle size was analyzed under different impact velocity , and the erosion effect on the different size particles was studied under the same impact velocity . It was found that the value of the equivalent plastic strain increased gradually with the increase of erosion rate . At the same time , the depth of erosion of target material and material failure zone volume also added step by step . When the plastic strain accumulated to a certain degree , the material will produce erosion damage . Under the same impact veloci-ty , the value of the maximum equivalent stress and the equivalent plastic strain increased gradually with the increase of the parti-cle size . Then , the squeezed indentation of target material gradually went deeper . Furthermore , the lips were formed around the eroded spot .At the same time ,the failure zone on the surface of target material extended in transverse and radial section .It can produce cracks and erosion damage ,when the stress value exceed the material yield limit .

关 键 词：固体颗粒 冲蚀磨损 动力学 数值模拟 

分 类 号：TG132.32[一般工业技术—材料科学与工程]