合肥工业大学学报（自然科学版）
閤肥工業大學學報（自然科學版）
합비공업대학학보（자연과학판）
JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE)
2014年
6期
641-644,694
,共5页
陆善彬%周璐瑶%郭赛
陸善彬%週璐瑤%郭賽
륙선빈%주로요%곽새
Gurson模型%Johnson-Cook模型%LS-OPT软件%材料失效
Gurson模型%Johnson-Cook模型%LS-OPT軟件%材料失效
Gurson모형%Johnson-Cook모형%LS-OPT연건%재료실효
Gurson model%Johnson-Cook model%LS-OPT software%material failure
文章对低碳钢Q235和铝合金6061T6试样在不同应力三轴度下进行拉伸试验，得到2种材料在不同工况下的力学性能。采用LS-OPT软件对Gurson模型相关参数进行优化，该优化方法既可以提高参数确定的效率，同时可以使Gurson模型在一定应力三轴度范围内适用。但Gurson模型不能准确预测在低应力三轴度下的失效，所以在低应力三轴度下引入Johnson-Cook模型的应变失效标准，以弥补剪切工况下的不足。通过比较Gurson模型和Johnson-Cook模型对2种材料在不同应力三轴度下的仿真结果，确定2种材料的Gurson-JC模型相关参数，以满足在较大范围内的应力三轴度下的仿真精准度。
文章對低碳鋼Q235和鋁閤金6061T6試樣在不同應力三軸度下進行拉伸試驗，得到2種材料在不同工況下的力學性能。採用LS-OPT軟件對Gurson模型相關參數進行優化，該優化方法既可以提高參數確定的效率，同時可以使Gurson模型在一定應力三軸度範圍內適用。但Gurson模型不能準確預測在低應力三軸度下的失效，所以在低應力三軸度下引入Johnson-Cook模型的應變失效標準，以瀰補剪切工況下的不足。通過比較Gurson模型和Johnson-Cook模型對2種材料在不同應力三軸度下的倣真結果，確定2種材料的Gurson-JC模型相關參數，以滿足在較大範圍內的應力三軸度下的倣真精準度。
문장대저탄강Q235화려합금6061T6시양재불동응력삼축도하진행랍신시험，득도2충재료재불동공황하적역학성능。채용LS-OPT연건대Gurson모형상관삼수진행우화，해우화방법기가이제고삼수학정적효솔，동시가이사Gurson모형재일정응력삼축도범위내괄용。단Gurson모형불능준학예측재저응력삼축도하적실효，소이재저응력삼축도하인입Johnson-Cook모형적응변실효표준，이미보전절공황하적불족。통과비교Gurson모형화Johnson-Cook모형대2충재료재불동응력삼축도하적방진결과，학정2충재료적Gurson-JC모형상관삼수，이만족재교대범위내적응력삼축도하적방진정준도。
T he basic sheet material fracture testing under different stress triaxialities and strain rates is carried out on specimens of low carbon steel Q 235 and aluminium alloy 6061T6 ,and the mechanical properties of these two materials under different working conditions are obtained .Six parameters of Gurson model are optimized by using LS-OPT software .This optimization method improves the effi-ciency in parameters determination and makes Gurson model applicable under a certain range of stress triaxiality .However ,Gurson model is incapable of predicting shear fracture under low stress triaxiali-ty .So an improved Gurson model with the strain failure criterion of Johnson-Cook model under low stress triaxiality is used to overcome this weakness under the shear working condition .Through the simulation and comparison of two materials under different stress triaxialities and strain rates by Gur-son model and Johnson-Cook model ,the relevant parameters of Gurson-JC model of the two materials are determined so as to satisfy the accuracy requirement under a wider range of stress triaxiality and strain rate .
