CAJ | 학술논문

采用考虑材料应变强化效应和包辛格效应的双线性材料模型,建立了厚壁圆筒自增强理论模型。基于工作时的等效应力及周向应力,提出了最佳自增强压力的评定方法并给出了理论求解过程。采用有限元软件对自增强厚壁圆筒涉及的三个加载过程进行模拟分析,模拟结果与理论计算结果相吻合。由模拟结果得到了厚壁圆筒工作时的最大等效应力和最大周向应力与自增强压力的关系曲线,并采用直接加权组合法进行优化,得到了最佳自增强压力。研究结果为厚壁圆筒最佳自增强压力的求解提供了新思路,具有一定的工程意义。
채용고필재료응변강화효응화포신격효응적쌍선성재료모형,건립료후벽원통자증강이론모형。기우공작시적등효응력급주향응력,제출료최가자증강압력적평정방법병급출료이론구해과정。채용유한원연건대자증강후벽원통섭급적삼개가재과정진행모의분석,모의결과여이론계산결과상문합。유모의결과득도료후벽원통공작시적최대등효응력화최대주향응력여자증강압력적관계곡선,병채용직접가권조합법진행우화,득도료최가자증강압력。연구결과위후벽원통최가자증강압력적구해제공료신사로,구유일정적공정의의。
A bilinear kinematic hardening autofrettage model was established and the stress formulae of three loading procedures were derived considering the strain-hardening and Bauschinger effect of material.Based on the hoop and equivalent working stresses,the best autofrettage pressure of thick walled cylinder was assessed and deduced.The relevant three procedures were simulated and the effect of autofrettage pressure on the maximum hoop and equivalent working stresses was established and the relation curves were given using finite element software.Multi-objective function was converted into single objective function using weighted array model and the best autofrettage pressure was obtained when the total objective function reached minimum.The research results herein provide new methods for acquiring the best autofrettage pressure and are valuable to practical project applications.