薄壁球壳压缩非对称屈曲特性的实验及有限元分析
PDF下载 (395)周刚毅,董新龙,郝伟伟.薄壁球壳压缩非对称屈曲特性的实验及有限元分析[J].宁波大学学报(理工版),2015,28(03):63-67.DOI:
ZHOU Gang-yi,DONG Xin-long,HAO Wei-wei.Experimental and Numerical Studies on Collapse Behaviors of Spherical Shells Compression[J].Journal of Ningbo University(Natural Science & Engineering Edition),2015,28(03):63-67.DOI:
| Title: | Experimental and Numerical Studies on Collapse Behaviors of Spherical Shells Compression |
| 作者: | 周刚毅, 董新龙, 郝伟伟 |
| Author(s): | ZHOU Gang-yi, DONG Xin-long, HAO Wei-wei |
| 关键词: | 薄壁球壳; 非对称屈曲; 力—位移响应曲线; 冲击速度 |
| Keywords: | thin-walled spherical shells; non-axisymmetric buckling; loading-deformation characteristics curves; impact velocity |
| 分类号: | O347.1 |
| 文献标识码: | A |
| 摘要: | 采用实验方法研究了球壳在刚性板准静态和冲击压缩下变形特性及非对称屈曲模态, 结合ABAQUS有限元分析了球壳冲击压缩下的屈曲变形过程、非对称屈曲特性, 探讨了其影响因素. 研究结果表明: (1)非对称屈曲模态与冲击速度相关, 随着加载速度提高, 薄壁球壳非对称屈曲从5边形转变为6边形. (2)在冲击速度较小时, 力—位移响应曲线及失稳变形模态与准静态几乎相同, 可近似按准静态过程分析. (3)在对称屈曲阶段的力—位移响应曲线, 有限元与实验结果吻合较好. 进一步对实验与有限元模拟结果在非对称屈曲阶段的差别进行了探讨, 认为冲击实验中平板与球壳的接触约束变化对非对称变形过程有重要作用. |
| Abstract: | The deformation behaviors of thin-walled spherical shells subject to quasi-state and dynamic com- pression are studied experimentally. The process of deformation, the non-axisymmetric buckling characteristic and its influence factors are analyzed in detail using ABAQUS finite element code. The results show that the deformation modes are dependent on the impact velocity. It is found that, if impact loading speed increases, the collapse modes shift from pentagons to hexagons. The dynamic loading-deformation curve on which the impact velocity is not very high is in good consistence with its quasi-static one. Meanwhile, the load-deformation curves of FEM simulation conform well to the experimental results at the stage of axi-symmetric inward dimple, but it is not so at the non-axisymmetric buckling stage. Furthermore, the process of deformation of spherical shells and its effect factors are discussed, suggesting that the contact constraints of surface between spherical shell and rigid plate play a significant role in the process of non-asymmetric deformation |
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| 备注/Memo: | 收稿日期: 2014?11?20. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 浙江省重中之重学科项目（ZJ1014; ZJ1230）. 第一作者: 周刚毅（1980－）, 男, 浙江淳安人, 助理研究员, 主要研究方向: 冲击动力学. E-mail: zhougangyi@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
