直升机主桨毂支臂疲劳试验技术研究

支臂是直升机球柔性桨毂中的典型复杂动部件,疲劳破坏为主要的失效模式.结合某直升机支臂疲劳试验,介绍了试验方案设计、试验实施方案设计及试验数据分析等内容和方法.考虑支臂结构及载荷和组合试验的特点,疲劳试验载荷的比例以模拟载荷分布为原则、以打样设计载荷为手段确定,载荷大小根据试验件的疲劳能力、寿命考核要求、各破坏部位和模式匹配考核确定；试验采取整体试验和局部考核相结合的方法,设计了由支臂和模拟桨叶组成的双铰支梁式支臂整体疲劳试验实施模型；试验监测数据分析有力地保证了试验的有效性.

Fatigue Test Study on Helicopter Main Rotor Sleeve

Sleeve is a typical assembly of the most crucial rotating components in the main spherical flexible rotor system of helicopter.Fatigue damage is its main failure mode.The content and method of fatigue test project design,test implement project design and test data analysis were introduced combined with some helicopter sleeve fatigue test.Considering the characteristic of sleeve structure,loading and combination test,the ratios of fatigue test loads were determined based on the load distribution by sizing loads.The test load magnitudes were chosen according to fatigue ability,objective life,life balance of different critical positions and failure modes of test parts.Holistic test and local tests were adopted in the sleeve test.Double reamed beam combined with sleeve and simulation blade holistic test implement mode was designed.Test measuring data analysis ensured effectively the validity of test.