摘要
铝硅聚苯酯封严涂层在航空发动机中有着广泛的应用,抗热震性能是评价其可靠性的重要标准。采用三点弯曲法测得封严涂层弹性模量,结合有限元软件ABAQUS对封严涂层热冲击过程中的应力分布进行模拟,探究粘接层厚度对应力变化的影响。结果表明,在一定范围内,随着粘接层厚度的增加,涂层表面应力和层交界处拉应力呈下降趋势,但部分点的压应力增加。结合封严涂层热震试验,目前的封严涂层抗热震性符合使用标准,为了进一步提高涂层抗热震性,可适当增加粘接层厚度。
An abradable sealing coating is widely used in aeroengine,which the thermal shock-resistance is one of the important elements on its reliability. The elastic modulus of the coating with three point bending method is measured. The stress distribution of sample during the thermal shock process was obtained via ABAQUS,the effect of the bonding coating thickness on the stress change was analyzed. The results show that the tensile stress of most points between the coating and the substrate are decreased with the increasing of bonding coating thickness,and the compressive stress on some points are increased. Comparing with the thermal shock test,the thermal shockresistance of abradable sealing coating meet the standard. The thermal shock-resistance can be improved by increasing bonding coating thickness.
出处
《机械科学与技术》
CSCD
北大核心
2016年第8期1273-1279,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
高等学校博士学科点专项科研基金项目(20130032130005)
国家自然科学基金与民航局联合重点项目(U1233201)
天津市科技支撑计划项目(13ZCZDGX00200)资助
关键词
封严涂层
抗热震性能
弹性模量
有限元法
abradable coating
thermal shock resistance
elastic modulus
FEM
