航空用钢丝增强氟塑料软管脉冲载荷下寿命预测方法  

Lifespan Prediction Method forAviation SteelWire Reinforced Fluoroplastic Hoses under Pulse Load

作　　者：冯凯 史志勇 李明[2] 吴亚东[2] 杜朝辉[2] FENG Kai;SHI Zhiyong;LI Ming;WU Yadong;DU Zhaohui(Shenyang Engine Research Institute,AECC,Shenyang 110011,China;School of Mechanical and Power Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]中国航空发动机集团有限公司沈阳发动机研究所,沈阳110011 [2]上海交通大学机械与动力工程学院,上海200240

出　　处：《噪声与振动控制》2023年第2期285-291,共7页Noise and Vibration Control

摘　　要：钢丝编织增强氟塑料高压软管广泛应用于航空发动机管路系统,以航空用某型号软管为研究对象,结合数值和试验的方法,研究其疲劳寿命性能。基于压力载荷下软管应变测量和钢丝尺度软管精细化有限元分析得到压力-钢丝应力模型,结合应变载荷谱和钢丝疲劳试验得到的钢丝应力寿命模型,对用于航空发动机外部管路中的聚四氟乙烯软管在脉冲载荷下的寿命进行预测,预测结果略有偏大,主要由于脉冲载荷下软管周向应力较大,且脉冲累计会持续增大周向应力,使软管寿命加速损耗,软管在脉冲载荷下疲劳失效形式以斜口破裂为主,与应力分析得到的断裂平面方向一致。Steel wire braided fluoroplastic high-pressure hoses are widely used in aero-engine piping systems.In this paper,the fatigue life performance of a certain type aviation hose is studied by numerical simulation and experimental methods.Based on hose strain measurement under pressure load and wire-scale hose refined finite element analysis,the pressure-wire stress model is obtained.Based on the strain load spectrum and the wire stress life model obtained from the wire fatigue test,the lifespan of PTFE hoses under pulse loads is predicted.It is found that the prediction result is slightly larger,mainly due to the large circumferential stress of the hose under the pulse load,and the pulse accumulation will continuously increase the circumferential stress,which will accelerate the loss of the hose life.The fatigue failure type of the hose under the pulse load is dominated by oblique fracture,which is consistent with the result of stress analysis.

关 键 词：振动与波 软管 钢丝编织 试验研究 寿命预测 疲劳失效 

分 类 号：V231.9[航空宇航科学与技术—航空宇航推进理论与工程]