应卢天健副校长和航天航空学院邀请，英国皇家学会院士、剑桥大学Calladine教授将来我校访问并开展学术交流。
    报告时间：2006年10月15日上午10：00
    报告地点：教一楼南208（强度与振动教育部重点实验室会议室
    届时，欢迎广大师生参加。

附件：
    Calladine教授是结构力学领域的著名权威，在板壳理论、塑性理论、结构稳定性以及DNA结构的力学模拟等方面取得国际公认的成就，其报告题目和摘要为：

BUCKLING OF CYLINDRICAL SHELLS:A PARADOX RESOLVED
C.R.Calladine
Department of Engineering, University of Cambridge,
Cambridge CB2 1PZ, UK
Abstract

    The classical theory of buckling of axially-loaded thin cylindrical shells predicts that the buckling stress is directly proportional to the thickness t, other things being equal.But empirical data show clearly that the buckling stress is proportional to t^1.5, other things being equal. As is well known, there is wide scatter in the buckling-stress data, ranging from one half to twice the mean value. Current theories of shell buckling attribute both the scatter and the low buckling stress – in comparison with the classical – to "imperfection-sensitive", non-linear structural behaviour. But those theories always take the classical analysis of an ideal, perfect shell as their point of reference.
    My aim in this talk is to explain the observed t^1.5 law, including the scatter, without the need to invoke the classical theory.

                                                                                              航天航空学院
2006年10月10日