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EFFECTS OF STRESS CONCENTRATORS ON DAMAGE EVOLUTION IN SIC/SIC COMPOSITES

机译:SIC / SIC复合材料中应力集中对损伤演化的影响

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Non-oxide ceramic matrix composites (CMCs) are currently being investigated for high temperature applications. Geometric induced redistribution of stress is an important factor in determining the mechanical performance of engineered materials, and understanding of it is necessary for their ultimate implementation as components. Towards this understanding, several melt infiltrated SiC/SiC coupons of different notch configurations, but similar constituents, were tested in tension with modal acoustic emission. Accurate stress-dependent damage locations were determined and compared with destructive fractography, revealing complicated damage morphology and allowing for comparison of traditional un-notched coupons. Similarly, accurate location analysis, in conjunction with precise microscopy, can provide for a deeper insight in the relationship between acoustic emission and fracture processes in CMCs.
机译:非氧化物陶瓷基复合材料(CMCs)目前正在研究用于高温应用。几何引起的应力的重新分布是确定工程材料的机械性能的重要因素,因此,对于最终实现它们作为组件的理解是必要的。为了达到这种理解,在模态声发射的张力下测试了几种具有不同缺口构造但成分相似的熔体渗入的SiC / SiC试样。确定了精确的应力相关损伤位置,并将其与破坏性的fractography相比较,揭示了复杂的损伤形态,并允许比较传统的无缺口试样。同样,准确的位置分析与精确的显微镜检查可以对CMC中声发射与破裂过程之间的关系提供更深入的了解。

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