CAJ | 학술논문

根据膨胀管膨胀过程的大塑性变形特点，讨论了膨胀管模拟过程中强化方式、应力-应变类型、膨胀锥半锥角以及膨胀锥膨胀区末端的倒角半径对膨胀载荷的影响，并把有限元模拟结果与膨胀试验数据进行对比分析。研究结果表明：倒角半径取值介于膨胀管膨胀前后管内半径之间时，膨胀载荷和膨胀锥的等效应力最小；采用真应力-应变曲线所得到的模拟结果与膨胀试验相比，误差较小，而采用工程应力-应变曲线和理想弹塑性力学模型进行模拟时，所得结果误差较大。
근거팽창관팽창과정적대소성변형특점，토론료팽창관모의과정중강화방식、응력-응변류형、팽창추반추각이급팽창추팽창구말단적도각반경대팽창재하적영향，병파유한원모의결과여팽창시험수거진행대비분석。연구결과표명：도각반경취치개우팽창관팽창전후관내반경지간시，팽창재하화팽창추적등효응력최소；채용진응력-응변곡선소득도적모의결과여팽창시험상비，오차교소，이채용공정응력-응변곡선화이상탄소성역학모형진행모의시，소득결과오차교대。
According to the large plastic deformation characteristics of expansion tubular in expan-ding process,the impacts of strengthening methods,stress-strain,semi-cone angle and chamfering radius of expansion cone on expansion load have been discussed,and the differences of experimen-tal and finite element simulation results have been compared and investigated.The results prove that,the expansion load and the equivalent stress of expansion cone are both minimal if the cham-fering radius value is between the expansion pipe radius before and after the expansion.Compa-ring the theoretical with experimental data of the true stress-strain curve,the result error is smal-ler,while the result errors of the engineering stress-strain data and ideal elastic-plastic mechanical model are too great.