Single-edged notched tension (SENT) specimen is used to study the fatigue crack growth rate (FCGR) behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displace...Single-edged notched tension (SENT) specimen is used to study the fatigue crack growth rate (FCGR) behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displacement (CMOD) vs. load and CMOD vs. crack length-to-width ratio with the known crack lengths. Numerical simulation is also done to try to establish a relation between crack length and CMOD. FCGR of welded and un-welded specimens are plotted against stress intensity factor range to show the effect of welding on fatigue crack growth rate of AISI 50100 steel. The experimentally obtained CMOD values are compared with values obtained by numerical simulation using ABAQUS/StandardTM software package. Results show that numerical values are in good agreement with experimental data for small crack lengths and lower values of applied load,展开更多
本文对应用SAR(Synthetic Aperture Radar)图像反演海面风场方法进行了阐述,并对三种反演模式进行仿真总结。首先介绍SAR图像风场反演的的物理机制,接着介绍风场反演的地球物理模式函数(Geophysical Model Function,GMF),并对CMOD4、CMO...本文对应用SAR(Synthetic Aperture Radar)图像反演海面风场方法进行了阐述,并对三种反演模式进行仿真总结。首先介绍SAR图像风场反演的的物理机制,接着介绍风场反演的地球物理模式函数(Geophysical Model Function,GMF),并对CMOD4、CMOD-IFR2和CMOD5三种模式进行仿真,得到雷达后向散射系数和风速、风向、入射角、极化方式的关系。特别对两个较新的极化比模式进行了介绍和分析。此外对当前应用美国CALIPSO激光雷达卫星资料验证海面风场的方法进行了阐述和探索。展开更多
基金supported by University of Engineering and Technology, Taxila
文摘Single-edged notched tension (SENT) specimen is used to study the fatigue crack growth rate (FCGR) behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displacement (CMOD) vs. load and CMOD vs. crack length-to-width ratio with the known crack lengths. Numerical simulation is also done to try to establish a relation between crack length and CMOD. FCGR of welded and un-welded specimens are plotted against stress intensity factor range to show the effect of welding on fatigue crack growth rate of AISI 50100 steel. The experimentally obtained CMOD values are compared with values obtained by numerical simulation using ABAQUS/StandardTM software package. Results show that numerical values are in good agreement with experimental data for small crack lengths and lower values of applied load,
文摘本文对应用SAR(Synthetic Aperture Radar)图像反演海面风场方法进行了阐述,并对三种反演模式进行仿真总结。首先介绍SAR图像风场反演的的物理机制,接着介绍风场反演的地球物理模式函数(Geophysical Model Function,GMF),并对CMOD4、CMOD-IFR2和CMOD5三种模式进行仿真,得到雷达后向散射系数和风速、风向、入射角、极化方式的关系。特别对两个较新的极化比模式进行了介绍和分析。此外对当前应用美国CALIPSO激光雷达卫星资料验证海面风场的方法进行了阐述和探索。