CAJ | 학술논문

分别采用平面应力和平面应变假设条件，对轴对称拉深成形法兰区的应力分布进行了分析比较，两种情况下的径向应力计算值相差较小，但周向应力计算值相差较大。有限元模拟表明，平面应力条件下得到的解析结果与模拟值非常接近，表明平面应力假设条件比平面应变假设条件更接近于实际情况。在平面应力条件下，建立了轴对称成形法兰区起皱失稳条件和圆筒形件破裂失稳条件，导出了临界压边力的计算式。对于某一具体的拉深成形问题，计算得到了临界压边力与拉深位置的关系曲线。分析结果有助于进一步认识拉深成形各变形区的变形特点，建立更符合实际的起皱、破裂准则，预测成形缺陷及临界压边力。
분별채용평면응력화평면응변가설조건，대축대칭랍심성형법란구적응력분포진행료분석비교，량충정황하적경향응력계산치상차교소，단주향응력계산치상차교대。유한원모의표명，평면응력조건하득도적해석결과여모의치비상접근，표명평면응력가설조건비평면응변가설조건경접근우실제정황。재평면응력조건하，건립료축대칭성형법란구기추실은조건화원통형건파렬실은조건，도출료림계압변력적계산식。대우모일구체적랍심성형문제，계산득도료림계압변력여랍심위치적관계곡선。분석결과유조우진일보인식랍심성형각변형구적변형특점，건립경부합실제적기추、파렬준칙，예측성형결함급림계압변력。
Plane stress and plane strain assumptions were adopted to make comparisons respec-tively in the stress distribution of the flange region in the axisymmetric deep drawing.The values o-f radial stress differ a little,while the values of circumferential stress vary in a large range,which were calculated under these two conditions.It can be shown from the finite element simulation that the an- alytical results of the plane stress assumption are very close to the simulation results,which means the plane stress assumption is closer to the actual situation than the plane strain assumption.Wrinkle instability conditions in the flange region and rupture instability conditions of cylindrical parts were constructed under the plane strain assumption.And the formula of critical BHF was deduced from the assumption.The project of critical BHF with drawing position for a specific deep drawing problem was obtained.The analysis results are useful for understanding of the characteristics of different de- formation regions in deep drawing process.Also,the analyses are helpful to set up more reliable crite- rions of wr