球面扁壳在径向脉冲荷载作用下的弹塑性动力响应研究

李海旺;树学峰;秦冬祺

振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 58-63.

PDF(1641 KB)
PDF(1641 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 58-63.
论文

球面扁壳在径向脉冲荷载作用下的弹塑性动力响应研究

  • 李海旺;树学峰;秦冬祺
作者信息 +

An elastic-plastic analysis on the behaviors of thin spherical shell subjected to radial rectangle impulse loadings

  • LIHaiwang;SHU Xuefeng;QIN Dongqi
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文章历史 +

摘要




摘要:球面扁壳在径向朝外脉冲荷载作用下,可能发生反直观行为;在径向朝内荷载作用下,则可能发生动力屈曲。本文通过大量的数值分析发现,两种动力响应除各自拥有自己的响应规律外,还拥有许多共同的特点。研究结果表明:在冲击荷载作用下,当荷载为径向朝内并达到一定值时该结构发生动力屈曲,当荷载为径向朝外并达到一定值域时,该结构发生反直观行为;反直观行为和动力屈曲的位移时程曲线均具有突变现象;反直观行为的最终变形模态和荷载方向相反,动力屈曲的最终变形模态与荷载方向相同;扁壳在冲击荷载作用下,发生反直观行为和动力屈曲时,对荷载的微小扰动都极其敏感;发生反直观行为和动力屈曲时的主要内力是薄膜力;反直观行为发生机理与动力屈曲机理基本类同。




Abstract

Abstract: The counter-intuitive behaviors of pin-ended thin spherical shell may happen under outward radial impulse loadings, while the buckling behaviors of it may happen under inward radial impulse loadings. By a large scale of numerical analyses, this paper finds the two types of dynamic responses have many identical features besides they have their own regular characteristics. The results show that the buckling behaviors occur when the impulse loads reach critical values under the inward radial impulse loading; the counter-intuitive behaviors occur when the impulse loads reach critical value ranges under outward radial loading; the abrupt changes exist in both displacement vs. time curves of the counter-intuitive behaviors and the dynamic buckling behaviors; the anomalous final deformed shapes is in the inverse direction of loadings, while the dynamic buckling final deformed shapes in the direction of loadings; Both the counter-intuitive behaviors and the dynamic buckling behaviors are all sensitive to the micro changes of the loadings; the inner force resulting in the counter-intuitive behaviors and the dynamic buckling behaviors is mainly the membrane force; the occurrence mechanism of the counter-intuitive behaviors is similar to that of the dynamic buckling.

关键词

固体力学 / 反直观动力响应 / 动力屈曲 / 矩形脉冲 / 球面薄壳

Key words

Solid mechanics / counter-intuitive behaviors / dynamic buckling / rectangle impulse loadings / pin-ended spherical shell

引用本文

导出引用
李海旺;树学峰;秦冬祺. 球面扁壳在径向脉冲荷载作用下的弹塑性动力响应研究[J]. 振动与冲击, 2010, 29(9): 58-63
LIHaiwang;SHU Xuefeng;QIN Dongqi. An elastic-plastic analysis on the behaviors of thin spherical shell subjected to radial rectangle impulse loadings[J]. Journal of Vibration and Shock, 2010, 29(9): 58-63

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