俄罗斯红松的应变率效应及吸能特性

发布时间：2018-03-03 19:24

本文选题：俄罗斯红松　切入点：高应变率　出处：《高压物理学报》2017年03期 　论文类型：期刊论文

【摘要】：针对广泛应用于包装运输和侵彻试验等工程领域的俄罗斯红松,实验研究了其在准静态载荷下的应力-应变关系和破坏模式。结果表明:俄罗斯红松在弦向和径向的变形均经历弹性变形、塑性变形和密实化3个阶段,而轴向在达到屈服极限后经历较小的塑性变形,然后发生破坏失效;弦向和径向破坏以沿纤维方向解离为主,而轴向破坏以扭结破碎为主。采用分离式霍普金森压杆装置,在500~5 000s~(-1)的应变率范围内对俄罗斯红松进行了高应变率动态压缩实验。结果表明:与弦向和径向相比,轴向初始屈服应力对应变率更敏感;随着应变率的升高,径向平台应力比弦向增加得更快;弦向和径向的吸能能力随应变率的增加逐渐提高,而轴向则逐渐下降;动态载荷下的破坏模式与准静态载荷下的破坏模式具有较高的相似性。
[Abstract]:Aimed at Russian Korean pine, which is widely used in packaging, transportation, penetration test and other engineering fields, The stress-strain relationship and failure mode of Pinus koraiensis under quasi-static loading are studied experimentally. The results show that the deformation of Pinus koraiensis in both the tangential and radial directions has three stages: elastic deformation, plastic deformation and compaction. The axial failure occurs after the yield limit has reached the yield limit, and then failure occurs. The chord and radial failure is mainly along the fiber direction, while the axial failure is mainly kink breakage. The split Hopkinson pressure bar device is used. The high strain rate dynamic compression experiments of Pinus koraiensis were carried out in the strain rate range of 500 ~ 5 000 s ~ (-1). The results show that the axial initial yield stress is more sensitive to the strain rate than that of the tangential and radial direction, and with the increase of the strain rate, the axial initial yield stress is more sensitive to the strain rate than that of the radial strain rate. The stress of radial platform increases faster than that of chord, the energy absorption ability of radial and chord increases gradually with the increase of strain rate, and the axial direction decreases gradually, and the failure mode under dynamic load is similar to that under quasi-static load.
【作者单位】：军械工程学院火炮工程系;
【基金】：军内科研项目
【分类号】：O347.3

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