摘要
大型机械装备关键部件工况恶劣,易产生应力集中并导致发展为宏观缺陷。设计开发一套交变应力测量系统,系统包括测量传感器、DDS信号激励模块、信号调理模块、信号采集与处理模块。基于电磁理论设计优化U型磁轭传感器,依据互相关原理设计信号调理模块,并利用该系统对受载Q235钢进行应力测试。实验结果表明,ΔBx参量随激励电压有显著变化,当激励电压为5 V时,ΔBx变化较小,构件屈服后仅有10 mV变化,激励电压为19 V且载荷为300 MPa时ΔBx达到98 mV。构件在弹性阶段ΔBx与应力呈线性变化,屈服后迅速增大;ΔBz变化较小且规律复杂,不适宜对应力进行评估。结果表明该系统为铁磁构件的应力测量提供了一种有效的测试方法。
The key parts of large machinery are most worked in poor conditions,which is easy to produce stress con-centration and leads to macroscopic defects. An alternating current stress measurement（ ACSM） system is designed, which includes measuring sensor, DDS signal generator module, signal adjusting module, signal acquisition and processing module. The U-shaped sensor is optimized based on electromagnetic theory. According to the principle of correlation,signal adjusting module is devised. The stress measurement experiments of loading Q235 steel are carried out by the system, the laws are presented in the test, which show that ΔBx has significant change with excitation voltage,the maximum of ΔBx is only 10 mV when voltage value is 5 V,but ΔBx can reach 98 mV when voltage value is 19 V and load is 300 MPa.ΔBx has linear variation with stress in the elastic stage and increases rapidly over yield point,the change of ΔBz is small and complicated,so the ΔBz is unfit for stress assessment. The results show that an effective method for stress measurement on ferromagnetic structure is provided by the system.
出处
《传感技术学报》
CAS
CSCD
北大核心
2014年第2期267-271,共5页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(51265041)
国家重大科学仪器设备开发专项项目(2013YQ140505)
江西省教育厅科技项目(GJJ12406
GJJ12444)
无损检测技术教育部重点实验室基金项目(ZD201029003)
关键词
无损检测
应力测量
交变应力测量法
U型磁轭传感器
铁磁构件
nondestructive testing
stress measurement
alternating current stress measurement
U-shaped sensor
ferromagnetic structure
