双频激振系统下带V型槽棒料下料寿命模型  

Blanking life model of V-groove bar based on dual-frequency excitation system

作　　者：化春键 任皓靖 陆云健 Hua Chunjian;Ren Haojing;Lu Yunjian(School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China;Jiangsu Key Laboratory of Food Manufacturing Equipment Technology , Jiangnan University , Wuxi 214122 , China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122

出　　处：《锻压技术》2019年第7期177-183,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(61573168);中央高校基本科研业务费专项基金资助项目(JUSRP11008)

摘　　要：针对双频激振系统下带V型槽棒料下料研究,需要建立下料寿命与带V型槽棒料几何参数及加载状态之间的关系。首先推导出带V型槽棒料裂纹尖端的应力强度因子SIF计算公式,并根据建立的双频激振系统的动力学模型,绘制出带V型槽棒料裂纹尖端所受应力谱,将复杂的应力简化处理,从而获得复合频率激振下的带V型槽棒料裂纹尖端的SIF值。然后根据裂纹扩展寿命公式,推导获得单频激振下的下料寿命模型,并依据SIF可以叠加的原理,获得复合频率激振下的下料寿命模型。最后通过搭建的双频激振系统设计实验,得到的实验结果与模型分析的规律一致,验证了所建立的下料寿命模型的正确性。For the study of V-groove bar blanking under dual-frequency excitation system, it is extremely important to establish the rela tionship between the blanking life and the geometry parameters and loading state of V-groove bar. First, the calculating formula of stress intensity factor SIF in the crack tip of V-groove bar was derived, and according to the established dynamic model of dual-frequency excita tion system, the stress spectrum in the crack tip of V-groove bar was plotted. Then, the complex stress was simplified, and the SIF value in the crack tip of V-groove bar was obtained under the compound frequency excitation. Furthermore, based on the crack extension life formula, the blanking life model under the single frequency excitation was generalized, and based on the SIF superposition principle, the blanking life model under the compound frequency excitation was generalized. Finally, the experimental results were consistent with that of the model analysis by the designed experiment under the dual-frequency excitation system, and the correctness of the established blanking life model was verified.

关 键 词：双频激振系统 带V型槽棒料 应力强度因子 下料寿命模型 复合频率激振低应力加载技术 

分 类 号：TB534[理学—物理]