%0 Journal Article
%T CRACK TIP SUPERBLUNTING: EXPERIMENT, THEORY AND NUMERICAL SIMULATION<br>裂尖超钝化:实验、理论与数值模拟
%A Yang Wei
%A Guo Tianfu
%A <br>杨卫
%A 郭田福
%A 傅增力
%J 力学学报
%D 1993
%I 
%X Experimental revelation of superblunting along plane strain predominant crack tip segment is reported here for modified polyproplene. As elucidated by a heuristic model of progressive circumferential cold-draw the formation of superblunting crack tip depends critically on the ratio between the cold -draw propagation speed and the loading speed, and contributes significantly to the material toughening,especially for the improvement on impact toughness. Detailed numerical calculations are conducted based on a hyperelastic -viscoplastic and anisotropic damage constitutive model at finite deformation. The simulated results recapitulate the essential features of crack tip superblunting.
%K crack tip superblunting
%K polyproplene
%K toughening
%K numerical simulation<br>裂尖超钝化
%K 聚丙烯
%K 增韧
%K 数值模拟
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=4100DA4A1A3BA1B0CE5AD99AE1DFB420&aid=C0F1FCE2A8026E63863628C262A8226E&yid=D418FDC97F7C2EBA&vid=C5154311167311FE&iid=E158A972A605785F&sid=3FC4D669D19FF0C6&eid=A94616C4391AA5EF&journal_id=0459-1879&journal_name=力学学报&referenced_num=2&reference_num=0