%0 Journal Article
%T THE CHARACTERISTICS OF INSTABILITY IN SOLID MATERIALS<br>固体材料不稳定性的特征
%A Li Guochen
%A Shen Huan
%A Ling Xianwu
%A <br>李国琛
%A 沈还
%A 凌贤伍
%J 力学学报
%D 2001
%I 
%X Based on analyzing the second variation of potential functional, one of the char-acteristics of the instability occurred in solid materials is proved as basically depending on the deterioration of material behavior. Another important feature is demonstrated that the funda-mental straining path is used to be disturbed and shifted into a mode of limiting an axial strain at instability. Sheet materials perforated periodically are numerically analyzed by finite-element method to exemplify how the strain localization around small holes eventually turns the strain-ing path into a failure mode of strain limitation. Metal forming tests on steel sheets loaded by flat-bottom punch also indicates such shift of straining path when approaching to failure.
%K void
%K bifurcation
%K material instability<br>孔洞
%K 分岔
%K 不稳定性
%K 固体材料
%K 二次变分
%K 金属板材
%K 拉胀成型实验
%K 势函数
%K 周期性分布
%K 孔洞损伤
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=4100DA4A1A3BA1B0CE5AD99AE1DFB420&aid=D0862E252585AEDD&yid=14E7EF987E4155E6&vid=27746BCEEE58E9DC&iid=38B194292C032A66&sid=2E01F39B6CBD53DE&eid=5A6705FDACED0BF9&journal_id=0459-1879&journal_name=力学学报&referenced_num=0&reference_num=12