Attenuation of axial stress waves in a long rod under high hydrostatic pressure

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (18) : 165-172.

LU Yong,ZHANG Yongmin,ZHANG Shaojie,LUO Cheng,QIU Aici

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Abstract

Aiming at the load push rod of controllable shock wave equipment used in the development of unconventional shale oil, a stress wave attenuation structure with built-in absorbing rod that can be used in high hydrostatic pressure environment is proposed. Based on the LSDYAN software and the simplified Johnson-Cook material model, the attenuation of stress wave in push rod was numerically studied. First, the reliability of the material model parameters and numerical algorithm is verified based on the experimental data. On this basis, the influence of different external environments, different load parameters and different absorber rod parameters on the stress wave attenuation effect is analyzed. Numerical results demonstrate that whether there is hydrostatic pressure outside has no significant effect on the stress wave absorption effect of the absorbing rod. However, the hydrostatic pressure will cause partial stress concentration in the cavity area, and the peak value of the equivalent stress on the inner wall can reach 100MPa under the external pressure of 50MPa. The absorption effect of the absorbing rod on the stress wave energy depends on the energy injected into it before it breaks away from the push rod. When the load parameters are suitable, the attenuation effect on the stress wave can be increased by connecting multiple absorbing rod structures in series. The research results can provide guidance and reference for the impact protection design of structures in underwater high hydrostatic pressure environment.

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high hydrostatic pressure / stress wave attenuation / finite element analysis;impact resistant structure

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LU Yong, ZHANG Yongmin, ZHANG Shaojie, LUO Cheng, QIU Aici. Attenuation of axial stress waves in a long rod under high hydrostatic pressure[J]. Journal of Vibration and Shock, 2024, 43(18): 165-172

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