CAJ | 학술논문

目的：研究 Q345中厚板在 V 形折弯时的应力应变中性层内移规律。方法通过对中厚板135°折弯过程进行数值模拟，分析了板料在成形过程中的等效应力应变及其中性层内移现象，测得了应变中性层与几何中间层之间的距离变化。在此基础上，采用厚度为16 mm 的 Q345板料进行物理实验，并与模拟结果进行了对比分析。结果在成形过程中，等效应力应变中性层均产生了内移现象，且应力中性层的内移量明显大于应变中性层的内移量；成形结束之后，应变中性层与几何中间层的距离为3.3 mm；实验结果显示，应变中性层的内移量为3.1 mm 左右，与模拟值较为一致。结论数值模拟方法可以为应力应变中性层计算提供指导。对于中厚板折弯，采用几何中间层展开求得的坯料尺寸并不准确。
목적：연구 Q345중후판재 V 형절만시적응력응변중성층내이규률。방법통과대중후판135°절만과정진행수치모의，분석료판료재성형과정중적등효응력응변급기중성층내이현상，측득료응변중성층여궤하중간층지간적거리변화。재차기출상，채용후도위16 mm 적 Q345판료진행물리실험，병여모의결과진행료대비분석。결과재성형과정중，등효응력응변중성층균산생료내이현상，차응력중성층적내이량명현대우응변중성층적내이량；성형결속지후，응변중성층여궤하중간층적거리위3.3 mm；실험결과현시，응변중성층적내이량위3.1 mm 좌우，여모의치교위일치。결론수치모의방법가이위응력응변중성층계산제공지도。대우중후판절만，채용궤하중간층전개구득적배료척촌병불준학。
Objective To investigate the internal shift law of the stress and strain in neutral layer of Q345 plate V-shaped bending. Methods By simulating the 135° bending process of the plate, equivalent stress and equivalent strain as well as their internal shift phenomenon of the neutral layers were analyzed. Meanwhile, the distance between the strain neu-tral layer and the geometric neutral layer was measured. On this basis, the physical test was carried out using a Q345 sheet with a thickness of 16 mm, then the results were compared and analyzed with the simulation result. Results During the forming process, stress neutral layer as well as strain neutral layer both showed the internal shift phenomenon, and the dis-placement of the stress neutral layer was greater than that of the strain neutral layer. After forming, the distance between the strain neutral layer and the geometric middle layer was 3. 3 mm. The test result showed that the displacement of the strain neutral layer was about 3. 1 mm, which had a better agreement with the simulation result. Conclusion Numerical simulation could provide guidance for the calculation of the stress neutral layer and the strain neutral layer. For plate ben-ding, the blank size obtained using expanded geometric middle layer was not accurate.