Research Initiation Award: Thermal Stresses in Chemically Reacting Media

摘要--CTS 9308813 Viljoen 研究了化学反应体系中的热应力这一跨学科问题。 这些现象的例子是在点燃状态下操作的填充床反应器中的催化剂载体的失效、金属丝网上的反应、催化转化器和多孔辐射燃烧器（PRB）。 对这些问题的系统分析将使我们能够设计更耐用的支架，延长转换器和昂贵的丝网材料（例如，Pt），并将PRB的应用扩展到瞬态和频繁的停机-启动操作。 提出了一个理论和实验研究的问题。 实验方案将围绕陶瓷样品与压电纤维嵌入矩阵内。 这些不同形状和尺寸的样品将暴露于燃烧环境。 将对应力进行直接测量，并将结果与理论结果相关联。 这种用于陶瓷结构的原位应力测量技术的发展也可以在暴露于高应力/温度环境的其他陶瓷结构中找到重要的应用。

ABSTRACT --CTS 9308813 Viljoen The interdisciplinary problem of thermal stress in a chemical reacting system is addressed. Examples of these phenomena are found in the failure of catalyst supports in packed bed reactors operating in the ignited state, reactions on metal gauzes, catalytic converters, and porous radiant burners (PRB). The systematic analysis of these problems will enable us to design more durable supports, extend the life of converters and expensive gauze material (e.g., Pt) and expand the application of PRB's to transient and frequent shut-down-start-up operations. Both a theoretical and experimental study of the problem is proposed. The experimental program will be developed around ceramic samples with piezo-electric fibers embedded inside the matrix. These samples of various forms and dimensions, will be exposed to a combustion environment. Direct measurements of the stress will be made and results will be correlated with theoretical results. The development of such an in-situ stress measurement technique for ceramic structures could also find important applications in other ceramic structures exposed to high stress/temperature environments.