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摘要: 针对工程技术领域的碰撞载荷削峰减载问题,以轴向串联式吸能管为研究对象,采用数值模拟与试验相结合的方法对其吸能特性开展研究。为了探索研究轴向串联式吸能管的吸能特性,首先基于材料高速拉伸试验,构建吸能管的材料Johnson-Cook动态本构参数,并对拟合参数有效性进行评估;随后通过数值模拟与高速冲击试验研究高速撞击过程中吸能管的缓冲吸能特性,评估仿真与试验的一致性;最后通过数值模拟对吸能管轴向串联构型与单管构型之间的吸能评价指标开展对比分析。分析研究表明:数值模拟与冲击试验的变形模式、载荷曲线、吸能评价指标均吻合较好,材料性能参数准确,仿真预示方法有效,高速冲击试验方案合理可信;与相同结构参数的串联构型吸能管相比,单管构型吸能管在压缩过程中会出现非轴对称、不稳定的扭曲变形,单管构型的有效压缩行程减小了13%,峰值载荷提高了33.4%,撞击瞬间载荷提高了15%,平均压缩力提高了13%,载荷峰均比提高了17.7%;吸能管的串联构型是更为理想的缓冲吸能结构。本研究可为吸能元件的性能预测与工程设计开发提供可靠的参考。
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Abstract: To address the issue of peak load reduction for impact loads in engineering technology, this study investigates the energy absorption characteristics of axial series energy absorbing tubes through a combination of numerical simulation and experimentation. Firstly, the Johnson-Cook dynamic constitutive parameters of the material 06Cr18Ni11Ti GB/T1220-2007 of energy absorbing tubes are established and evaluated based on high-speed tensile tests which indicates 06Cr18Ni11Ti has obvious strain rate hardening effect. Subsequently, numerical simulation and high-speed impact tests are conducted to examine the energy absorption characteristics of energy absorption tubes, with an evaluation of consistency between numerical simulation and test results. The numerical simulation is based on the time-step ABAQUS/Explicit finite element simulation platform. The high speed impact test system uses the high pressure gas inside the air actuated piston cylinder as the power source, which can accelerate the mass block to a speed of 30m/s. Finally, the energy absorption evaluation indexes between the axial series configuration and the single configuration of the energy absorption tube were compared and analyzed by numerical simulation. The analysis demonstrates that deformation mode, load curve, and energy absorption evaluation indexes from both numerical simulations and impact tests exhibit good agreement. The accuracy of material performance parameters confirms the effectiveness of simulation prediction methods while validating reasonability and reliability of high-speed impact test schemes. Compared to axial series configurations with identical structural parameters, single-tube configurations display asymmetric and unstable twist deformations during compression processes. Single-tube configurations experience a 13% reduction in effective compression stroke along with a 33.4% increase in peak load, 15% increase in instantaneous impact load, 13% increase in average compression force, as well as a 17.7% increase in peak-to-average load ratio. Consequently, axial series configurations prove to be more ideal energy absorbing structures. This study can provide a reliable reference for the performance prediction and engineering design and development of energy absorbing components. -
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