起重运输机械
起重運輸機械
기중운수궤계
HOISTING AND CONVEYING MACHINERY
2014年
10期
5-8
,共4页
单元“生死”技术%桁架结构%疲劳失效路径%强度失效路径
單元“生死”技術%桁架結構%疲勞失效路徑%彊度失效路徑
단원“생사”기술%항가결구%피로실효로경%강도실효로경
“birth-dead”element technology%truss structure%fatigue failure route%strength failure route
应用Ansys分析某超静定桁架结构，提取应力最大单元，并利用单元“生死”技术“杀死”该单元，得出结果与删除该单元的模型的计算结果进行对比，得出“生死”技术是在不改变模型网格划分的条件下实现模型的局部增减。根据桁架结构强度失效和疲劳失效的特点，并用实例说明，单元“生死”技术可用于疲劳失效模式失效路径的模拟而不适于强度失效模式失效路径的模拟，但单元“生死”技术用于桁架结构强度失效模式失效路径的模拟则偏安全。
應用Ansys分析某超靜定桁架結構，提取應力最大單元，併利用單元“生死”技術“殺死”該單元，得齣結果與刪除該單元的模型的計算結果進行對比，得齣“生死”技術是在不改變模型網格劃分的條件下實現模型的跼部增減。根據桁架結構彊度失效和疲勞失效的特點，併用實例說明，單元“生死”技術可用于疲勞失效模式失效路徑的模擬而不適于彊度失效模式失效路徑的模擬，但單元“生死”技術用于桁架結構彊度失效模式失效路徑的模擬則偏安全。
응용Ansys분석모초정정항가결구，제취응력최대단원，병이용단원“생사”기술“살사”해단원，득출결과여산제해단원적모형적계산결과진행대비，득출“생사”기술시재불개변모형망격화분적조건하실현모형적국부증감。근거항가결구강도실효화피로실효적특점，병용실례설명，단원“생사”기술가용우피로실효모식실효로경적모의이불괄우강도실효모식실효로경적모의，단단원“생사”기술용우항가결구강도실효모식실효로경적모의칙편안전。
The indeterminate truss structure is analyzed in Ansys in the paper.The maximum stress element is extrac-ted and the“birth-dead”element technology is used to kill the element.The results will be compared with the calculated re-sult from the model deleting the element.It's shown that the “birth-dead”element technology is applied to realize local in-crease and decrease of the model without changing the model grid division.Based on the characteristics of strength failure and fatigue failure of the truss structure,it's proved that the “birth-dead”element technology can be used for simulation of failure route of fatigue failure mode instead of strength failure mode,but it can be safe when it's adopted for simulation of failure route under the strength failure mode for the truss structure.
