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首页> 外文期刊>Journal of Composites Science >Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach
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Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach

机译：SiC / SiC Minic复合材料在空气中高达1200°C的静态疲劳：多尺度方法

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摘要

The present paper investigates the static fatigue behavior of Hi-Nicalon fiber-reinforced SiC– SiC minicomposites at high temperatures in the 900–1200 ?C range, and under tensile stresses above the proportional limit. The stress–rupture time relation was analyzed with respect to subcritical crack growth in filaments and fiber tow fracture. Slow crack growth from flaws located at the surface of filaments is driven by the oxidation of free carbon at the grain boundaries. Lifetime of the reinforcing tows depends on the statistical distribution of filament strength and on structural factors, which are enhanced by temperature increase. The rupture time data were plotted in terms of initial stresses on reinforcing filaments. The effect of temperature and load on the stress–rupture time relation for minicomposites was investigated using results of fractography and predictions of minicomposite lifetime using a model of subcritical growth for critical filaments. The critical filament is the one whose failure by slow crack-growth triggers unstable fracture of the minicomposite. This is identified by the strength–probability relation provided by the cumulative distribution function for filament strength at room temperature. The results were compared to the fatigue behavior of dry tows. The influence of various factors related to oxidation, including multiple failures, load sharing, and variability, was analyzed.
机译：本文研究了在900-1200？C范围内的高温下高温纤维增强SiC复合材料的静态疲劳行为，在比例极限的拉伸应力下。关于细丝和纤维丝束骨折的亚临界裂纹生长分析了应力破裂时间关系。从位于长丝表面的缺陷的漏洞的缓慢裂纹增长是通过晶界的游离碳的氧化驱动。增强粉末的寿命取决于长丝强度和结构因素的统计分布，这些因素通过温度升高增强。在钢筋初始胁迫方面绘制了破裂时间数据。使用亚临界生长模型对临界长丝的模型研究了温度和负荷对微型复合材料的应力破裂时间关系的影响。临界灯丝是通过缓慢裂纹 - 生长的失败的灯丝触发Minichosphite的不稳定断裂。这是通过在室温下累积分布函数的累积分布函数提供的强度概率关系来识别。将结果与干奶嘴的疲劳行为进行比较。分析了与氧化有关的各种因素的影响，包括多重故障，负荷分配和变异性。

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