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Dynamic Loads in the Fan Containment Structure of a Turbofan Engine

机译：涡轮风扇发动机风扇遏制结构中的动态载荷

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摘要

In accordance with the FAA certification requirements, all modern commercial turbofan engines must successfully demonstrate its ability to withstand a fan blade-out (FBO) event through actual test. Possibility of losing a rotating fan blade from a running engine is a flight safety consideration, which must be addressed during the design phase of the engine. A typical fan blade-out event involves very complex nonlinear transient dynamics with large deflection of the release blade and rigid body rotation of the trailing blade as well as progressive failure and fragmentation of various components. Due to the nature of the impact type loading, the solution to the problem should also address dependence of the material behavior such as yield strength as a function of strain rates. In short, the transient dynamic analysis of a fan blade-out event highlights the complexity of the numerical technique, which includes all the nonlinearities of structural dynamics: plastic behavior of the materials, large displacements, and contact interaction between structural elements. In this paper, we present the results of a LS-DYNA simulation of a FBO event on a full-engine analytical model, which covers both the primary as well as secondary damages.
机译：根据FAA认证要求，所有现代商用涡轮风扇发动机都必须通过实际测试成功展示其承受风扇叶片熄灭（FBO）事件的能力。从运行中的发动机丢失旋转风扇叶片的可能性是出于飞行安全考虑，必须在发动机的设计阶段予以解决。典型的风扇叶片熄灭事件涉及非常复杂的非线性瞬态动力学，其中释放叶片的挠度大，后叶片的刚体旋转以及各个组件的渐进式故障和破碎。由于冲击型载荷的性质，该问题的解决方案还应解决材料行为的依赖性，例如屈服强度随应变率的变化。简而言之，对风机叶片熄灭事件的瞬态动力学分析突出了数值技术的复杂性，其中包括结构动力学的所有非线性：材料的塑性行为，大位移以及结构元素之间的接触相互作用。在本文中，我们介绍了在完整发动机分析模型上进行的FBO事件的LS-DYNA模拟结果，该模型涵盖了主要和次要损害。

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