DEVELOPMENT OF SIMULATION METHODOLOGY FOR THE INTERACTION BETWEEN A SEPARATED FAN BLADE AND THE ABRADABLE RUB STRIP IN TURBOFAN ENGINES EXPERIENCING A FAN BLADE-OFF EVENT

温莎大学和普惠加拿大公司（P&WC）之间的这一合作研究项目的目标是开发一种精确的模拟方法，以模拟与涡轮风扇发动机转子分离的风扇叶片对发动机可磨损摩擦条的高速冲击。模拟方法将包括开发一种可磨耗材料的本构材料模型，并结合一种数值方法，该方法能够表示风扇叶片与摩擦条的高速相互作用和穿透的力学。普惠加拿大公司将使用这项技术作为其全发动机数值模型的一个组成部分，该模型是为支持发动机认证计划而开发的，用于叶片包容性评估。开发模拟方法的方法将包括（i）在不同载荷、温度和应变率条件下广泛表征可磨耗材料，（ii）本构材料建模，以及（iii）研究多种先进数值方案的适用性，以模拟风扇叶片/可磨耗条相互作用。一个广泛的测试计划，包括高速冲击和摩擦测试，将进行，以促进开发的建模验证。除了模拟方法，在这个项目中创建的新知识将包括推进的温度和应变率的非均匀多孔材料，如用于制造可磨耗带的材料的行为的基本理解，了解这种材料的渗透力学，和本构模型，包括多个功能的可磨耗带材料。P&WC开发这项新技术的一个主要好处将是提高其全发动机数值模型在预测风扇叶片脱落事件结果方面的准确性。这将使新发动机认证所需的物理测试数量最小化，从而避免数百万美元的成本，降低发动机开发成本和交付周期，使P&WC在全球市场上更具竞争力，并更快地部署新产品。

The objective of this collaborative research project between the University of Windsor and Pratt & Whitney Canada (P&WC) is to develop an accurate simulation methodology to model the high-speed impact of a fan blade separated from the rotor of a turbofan engine on the abradable rub strip of the engine. The simulation methodology will include the development of a constitutive material model for abradable material combined with a numerical method capable of representing the mechanics of high-speed interaction and penetration of the rub strip by the fan blade. Pratt & Whitney Canada will use this technology as an integral part of their full-engine numerical models developed for blade containment evaluation in support of engine certification programs. The approach to developing the simulation methodology will include (i) extensively characterizing the abradable material at different loading, temperature, and strain-rate conditions, (ii) constitutive material modeling, and (iii) investigating the applicability of multiple advanced numerical schemes to simulate the fan blade/abradable strip interaction. An extensive testing program, including high-speed impact and rub tests, will be conducted to facilitate validation of the developed modeling. Besides the simulation methodology, new knowledge created in this project will include advancing the fundamental understanding of the temperature- and strain rate-dependent behavior of heterogeneous porous materials, such as the material used in making of abradable strips, understanding the penetration mechanics of such materials, and a constitutive model incorporating multiple features of the abradable strip material. A major benefit to P&WC from developing this new technology will be increased accuracy of their full-engine numerical models in predicting the outcomes of fan blade-off events. This will enable minimizing the number of physical tests required for new engine certification, thus providing multimillion-dollar cost avoidance and decreasing engine development costs and lead-time, allowing P&WC to be more competitive in the global market and deploy new products much faster.