多筋构件等温局部加载材料跨变形区转移的快速预测  

Rapid prediction on material transfer across deformation zones for multi-rib component under isothermal

作　　者：唐海兵 魏科[1] 杨超 丁潼 何国云 Tang Haibing;Wei Ke;Yang Chao;Ding Tong;He Guoyun(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《锻压技术》2023年第10期8-15,共8页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52005241);国家留学基金委项目(202208360107);江西省研究生创新专项资金项目(YC2021-S673)。

摘　　要：针对多筋构件在等温局部加载过程中固有的材料跨区转移以及可能产生的折叠问题,提出了一种能快速预测材料转移体积的方法。首先,提取局部加载过渡区的几何特征结构,并设计形状简易的等厚坯料以详细地反映材料跨区转移特征;其次,采用有限元模拟与物理模拟实验,分析多筋构件局部加载成形过程,根据过渡区材料流动特征及应力状态,将加载区材料分为3个区域;随后,根据大小相等且方向相反的力平衡条件,对这3个区域的基元体进行受力分析,通过联立力的平衡方程与屈服方程,利用边界条件对方程进行求解,得到分流面位置及材料转移体积的预测模型;最后,将有限元分析结果与预测模型结果进行对比,证实了预测结果的合理性和可靠性。Aiming at the inherent cross-area material transfer and the possible folding problem of multi-rib components in the isothermal local loading process,a method for quickly predicting the material transfer volume was proposed.Firstly,the geometric feature structure of transition zone under the local loading was extracted,and the equal thickness blank with a simple shape was designed to reflect the cross-area material transfer characteristics in detail.Secondly,the local loading forming process of multi-rib components was analyzed by finite element simulation and physical simulation experiments.Then,according to the material flow characteristics and stress state of material in the transition zone,the material in the loading zone was divided into three regions,and according to the force balance condition of equal size and opposite direction,the force analysis on the elementary bodies in these three zones was performed.Furthermore,the prediction model of neutral layer position and material transfer volume was obtained by the force equilibrium equation,yield equation and boundary conditions to solve the equation.Finally,the finite element analysis results were compared with the results of the prediction model to verify the rationality and reliability of the prediction results.

关 键 词：等温局部加载 材料转移体积 分流面 折叠 力平衡 

分 类 号：TG156[金属学及工艺—热处理]