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首页> 外文期刊>Journal of Materials Engineering and Performance >Material Constitutive Models for Creep and Rupture of SiC/SiC Ceramic-Matrix Composites (CMCs) Under Multiaxial Loading
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Material Constitutive Models for Creep and Rupture of SiC/SiC Ceramic-Matrix Composites (CMCs) Under Multiaxial Loading

机译：多轴载荷下SiC / SiC陶瓷基复合材料（CMC）蠕变和破裂的材料本构模型

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摘要

Material constitutive models for creep deformation and creep rupture of the SiC/SiC ceramic-matrix composites (CMCs) under general three-dimensional stress states have been developed and parameterized using one set of available experimental data for the effect of stress magnitude and temperature on the time-dependent creep deformation and rupture. To validate the models developed, another set of available experimental data was utilized for each model. The models were subsequently implemented in a user-material subroutine and coupled with a commercial finite element package in order to enable computational analysis of the performance and durability of CMC components used in high-temperature high-stress applications, such as those encountered in gas-turbine engines. In the last portion of the work, the problem of creep-controlled contact of a gas-turbine engine blade with the shroud is investigated computationally. It is assumed that the blade is made of the SiC/SiC CMC, and that the creep behavior of this material can be accounted for using the material constitutive models developed in the present work. The results clearly show that the blade-tip/shroud clearance decreases and ultimately becomes zero (the condition which must be avoided) as a function of time. In addition, the analysis revealed that if the blade is trimmed at its tip to enable additional creep deformation before blade-tip/shroud contact, creep-rupture conditions can develop in the region of the blade adjacent to its attachment to the high-rotational-speed hub.
机译：已经开发了在一般三维应力状态下SiC / SiC陶瓷基复合材料（CMC）蠕变变形和蠕变断裂的材料本构模型，并使用一组可用的实验数据来参数化该模型，以分析应力大小和温度对材料的影响。时间相关的蠕变变形和破裂。为了验证开发的模型，每个模型都使用了另一组可用的实验数据。随后，这些模型在用户材料子例程中实现，并与商业有限元软件包结合在一起，以便能够对高温高应力应用中使用的CMC组件（如在天然气中遇到的那些组件）的性能和耐久性进行计算分析。涡轮发动机。在工作的最后一部分，通过计算研究了燃气轮机叶片与护罩的蠕变控制接触问题。假定叶片由SiC / SiC CMC制成，并且可以使用本工作中开发的材料本构模型来解释这种材料的蠕变行为。结果清楚地表明，随着时间的流逝，叶梢/护罩间隙减小并最终变为零（必须避免的情况）。此外，分析表明，如果在刀片尖端/外罩接触之前对刀片的尖端进行修整，以实现额外的蠕变变形，则在与刀片附接至高转角的区域附近可能会出现蠕变断裂条件。速度枢纽。

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