CAJ | 학술논문

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/LS-DYNA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。
침대연기륜궤협편재고체최화제과립하충식마손인기피로파배적공정문제，운용유한원연건ANSYS/LS-DYNA건립고온합금재료단과립충식역학모형，진행료삼유현시충격동역학계산급충식궤리분석；연구료상동과립척촌하불동충식속도대파재적충식규률，급동일충식속도시불동척촌과립적충식효과。결과표명，수착충식속도증대，등효소성응변치축점증대，과립대파재적충식심도화재료실효구체적야축점증가，당응변루적도일정정도시，재료발생충식파배。동일충식속도하，최대등효응력화등효소성응변폭치수과립증대축점증가，파체재료피제압적요갱압흔축점가심，사주형성진편；파체표층적재료실효구발생횡향화경향확전。당응력치초과재료적굴복겁한시취회산생렬문，발생충식파배。
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 .