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

温莎大学和加拿大普惠公司(P&WC)的这一合作研究项目的目标是开发一种准确的模拟方法，以模拟从涡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可磨损材料的本构材料模型，并结合能够描述高速相互作用和风扇叶片对摩擦条侵彻的力学的数值方法。普惠加拿大公司将使用这项技术作为他们为支持发动机认证计划而开发的用于叶片包容评估的全发动机数值模型的组成部分。发展模拟方法的途径将包括(I)在不同载荷、温度和应变率条件下对可磨损材料进行广泛的表征，(Ii)本构材料建模，以及(Iii)研究多种先进的数值格式在模拟风扇叶片/可磨损条相互作用中的适用性。将进行广泛的测试计划，包括高速冲击和摩擦测试，以便于验证所开发的模型。除了模拟方法，该项目中创造的新知识将包括促进对非均质多孔材料的温度和应变率相关行为的基本理解，例如用于制造可磨损条带的材料，了解此类材料的渗透机理，以及包含可磨损条带材料的多种特征的本构模型。P&WC从开发这项新技术中获得的一个主要好处是提高了他们的全引擎数值模型在预测风扇叶片关闭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次数降至最低，从而避免数百万美元的成本，并减少发动机开发成本和交货期，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.