Effects of axial static loads on stress wave amplitude in at apered aluminum rod

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 51-57.

YUAN Wei1,3, CHANG Junran2, JIN Jiefang1,3, WANG Jie1, LIANG Chen1, WU Yue4, ZHANG Rui1, WANG Xibo1

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Abstract

Aiming at engineering practice of variable cross-section members being subjected to coupled static-dynamic loads, effects of axial static stress on amplitude of stress wave in a rod with variable cross-section were studied.Based on a SHPB test system with coupled static-dynamic loading, stress wave propagation tests for a tapered aluminum rod were performed under different axial static loads.Time history curves of dynamic strain were measured with strain gauges arranged at different positions in axial direction, and propagation attenuation characteristics of stress wave were characterized with variation laws of dynamic strain amplitudes versus propagating distance and static loads.The results showed that axial static loads have a larger effect on decrease in stress wave;with increase in static loads, stress wave’s propagating velocity in the tapered aluminum rod slightly increases firstly, and then tends to be constant;amplitude spatial attenuation coefficient reveals a variation feature of “slightly decrease-almost constant”, while response amplitude at the tapered rod’s incident end decreases continuously, its rate gradually increases firstly and then tends to be constant;amplitudes of different strain gauges decrease almost linearly with increase in static loads, the farther the distance from the incident end, the smaller the decrease rate of amplitude.

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stress wave / rod with variable cross-sectional areas / axial static stress / waveform / propagating velocity / spatial attenuation

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YUAN Wei1,3, CHANG Junran2, JIN Jiefang1,3, WANG Jie1, LIANG Chen1, WU Yue4, ZHANG Rui1, WANG Xibo1. Effects of axial static loads on stress wave amplitude in at apered aluminum rod[J]. Journal of Vibration and Shock, 2019, 38(17): 51-57

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