A microstructure-based modelling approach was used to study the deformation behaviour of polycrystalline honeycomb structures under rubbing loading. Rubbing originates from the sliding contact between sealing surfaces in a gas turbine engine. As a stationary component of the sealing system, the honeycomb structure’s role is to prevent catastrophic failure of the rotating component. Therefore, normal forces and surface deformations of the honeycomb structure need to be minimised to limit the heat input into the rotating component. To achieve a detailed representation of the honeycomb material response, the constitutive behaviour of the employed nickel-based superalloys Hastelloy X and Haynes 214 was modelled with a crystal plasticity approach, utilising a finite element framework. Uniaxial tensile tests at relevant temperatures and strain rates resembling the rubbing allowed the identification of crucial model parameters. The simulative studies based on the unit cell of the honeycomb structure revealed that the normal forces and the surface deformations are strongly affected by the microstructural features (size and orientation of the grains) and the applied deformation rate. In addition, a significant amount of residual stresses could be found for the macroscopically unstressed state after cooling and unloading.

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基于微结构的多晶蜂窝结构摩擦建模

基于微观结构的建模方法被用来研究多晶蜂窝结构在摩擦载荷下的变形行为。摩擦源自燃气涡轮发动机中密封面之间的滑动接触。作为密封系统的固定组件，蜂窝结构的作用是防止旋转组件发生灾难性故障。因此，需要使蜂窝结构的法向力和表面变形最小化，以限制输入到旋转部件中的热量。为了获得蜂窝材料响应的详细表示，采用有限元框架通过晶体可塑性方法对所使用的镍基高温合金Hastelloy X和Haynes 214的本构行为进行建模。在与摩擦类似的相关温度和应变速率下的单轴拉伸试验可以确定关键的模型参数。基于蜂窝结构的晶胞的模拟研究表明，法向力和表面变形受微观结构特征（晶粒的尺寸和方向）和施加的变形速率的强烈影响。另外，在冷却和卸载之后，对于宏观的无应力状态，可以发现大量的残余应力。基于蜂窝结构的晶胞的模拟研究表明，法向力和表面变形受微观结构特征（晶粒的尺寸和方向）和施加的变形速率的强烈影响。另外，在冷却和卸载之后，对于宏观上无应力的状态可以发现大量的残余应力。基于蜂窝结构的晶胞的模拟研究表明，法向力和表面变形受微观结构特征（晶粒的尺寸和方向）和施加的变形速率的强烈影响。另外，在冷却和卸载之后，对于宏观上无应力的状态可以发现大量的残余应力。