CAJ | 학술논문

对焦炭塔材料15CrMoR在20℃、200℃、300℃及400℃下进行单轴拉伸试验与单轴棘轮效应试验，利用OW-II随动强化模型对材料的棘轮应变进行预测，模型能较好地预测材料稳定段的棘轮应变率。运用动态坐标系法对焦炭塔进油及进水两种工况进行瞬态温度场分析，确定轴向移动温差及其特征量，为焦炭塔循环塑性分析确定简化的温差特征载荷。对焦炭塔筒体进油生焦及进水冷焦两种工况进行循环塑性分析，发现进油及进水轴向温差渐变范围下对齐时结构具有更大的棘轮应变率，内压循环的同时作用会增大结构的棘轮应变。通过参数化计算，确定焦炭塔结构的棘轮边界，当进水轴向温差高度较小时棘轮边界受内压循环的影响较大。
대초탄탑재료15CrMoR재20℃、200℃、300℃급400℃하진행단축랍신시험여단축극륜효응시험，이용OW-II수동강화모형대재료적극륜응변진행예측，모형능교호지예측재료은정단적극륜응변솔。운용동태좌표계법대초탄탑진유급진수량충공황진행순태온도장분석，학정축향이동온차급기특정량，위초탄탑순배소성분석학정간화적온차특정재하。대초탄탑통체진유생초급진수랭초량충공황진행순배소성분석，발현진유급진수축향온차점변범위하대제시결구구유경대적극륜응변솔，내압순배적동시작용회증대결구적극륜응변。통과삼수화계산，학정초탄탑결구적극륜변계，당진수축향온차고도교소시극륜변계수내압순배적영향교대。
Experiments of uniaxial tension and ratcheting of material of coke tower 15CrMoR are carried out under 20℃ , 200℃ , 300℃ , and 400℃ . The ratcheting strain of the material is predicted by OW-II model, which could predict the stable ratcheting strain rate of the material well. The transient temperature field under oil-feeding and water quenching are numerically simulated with the help of dynamic coordinate system method, which yields the axial temperature difference and its characteristic value for the simplified characteristic temperature load to be used in the cyclic plastic analysis of coke drum. According to the cyclic plastic analysis of coke drum cycled between oil-feeding and water quenching, the bottom alignment of temperature difference ranges produces much ratchet strain rate. In addition, the co-existence of cyclic internal pressure would increase the ratcheting strain of the structure. By parametric study, the ratchet boundary is determined for the temperature gradient under oil-feeding and water quenching. It indicates that, when temperature difference range of water quenching is smaller, the ratchet boundaries would be influenced much more by the cyclic internal pressure.