运输包装随机振动疲劳曲线及加速振动试验技术

Random vibration fatigue curve and accelerated vibration test technology of transport package

  • 摘要: 推导了运输包装三轴随机振动激励下产品上关注点的von Mises 等效应力与激励加速度均方根值的关系,证明了关注点处材料应力疲劳曲线(σ-N曲线)和运输包装振动疲劳曲线(Grms-T曲线)的等价性;针对两类工程上常用的Basquin型(幂函数型)和指数函数型损伤和疲劳模型,给出了其Grms-T曲线形式,得到了基于Grms-T曲线的运输包装加速随机振动时间压缩比,并通过产品模型有限元算例验证了其正确性。由于加速度易于分析和测量,因此基于Grms-T曲线的运输包装加速随机振动试验技术具有潜在的应用价值和进一步研究发展空间。

     

    Abstract: In this paper,the relation between the von Mises equivalent stress at the concerned point and the root mean square of the excitation acceleration on the transport package under triaxial random vibration excitation is derived. The equivalence between the stress fatigue curve(σ-N curve)at the concerned point and the vibration fatigue curve(Grms-T curve)of the transport package is certificated. For the two types of damage and fatigue models commonly used in engineering,that is,the Basquin type(power function type)and the exponential function,the corresponding Grms-T equations are obtained. The time compression ratio of accelerated random vibration test for transport package is given based on the Grms-T curve,and its validity is verified by the finite element analysis of product model. As the acceleration is easy to analysis and measurement,the accelerated random vibration test technology for transport package based on the Grms-T curve has application and development potential for further researches.

     

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