Micro radial compression tests were carried out on cylindrical specimens of pure copper polycrystals with different grain sizes. Experimental results indicated that phenomena of decreasing forming force, increasing sc...Micro radial compression tests were carried out on cylindrical specimens of pure copper polycrystals with different grain sizes. Experimental results indicated that phenomena of decreasing forming force, increasing scatter of forming force and more irregular surface topography occurred with the increase of grain size. A modified surface model based on dislocations pile-up in surface layer grains, and a flow stress scattering formulation based on standard deviation and grain size distribution were proposed to analyze size effects on forming force in micro compression. The inhomogeneous deformation of surface layer grains was discussed by the main deformation manner of rotation. A good agreement with the experimental results was achieved.展开更多
This paper provides a review of recent research advances and trends in the area of stability of unstiffened circular cylindrical shells subjected to general non-uniform axial compressive stresses.Only the more importa...This paper provides a review of recent research advances and trends in the area of stability of unstiffened circular cylindrical shells subjected to general non-uniform axial compressive stresses.Only the more important and interesting aspects of the research,judged from a personal viewpoint,are discussed.They can be crudely classified into four categories:(1) shells subjected to non-uniform loads;(2) shells on discrete supports;(3) shells with intended cutouts/holes;and (4) shells with non-uniform settlements.展开更多
锂离子电池的容量损失是可循环锂损失机制与多种活性材料损失机制共同作用的结果,整体容量损失相同的电池可能由于各机制占比的不同,呈现出截然不同的剩余生命衰减轨迹。如何对电池老化过程中各机制的损失情况进行准确的诊断,对于电池...锂离子电池的容量损失是可循环锂损失机制与多种活性材料损失机制共同作用的结果,整体容量损失相同的电池可能由于各机制占比的不同,呈现出截然不同的剩余生命衰减轨迹。如何对电池老化过程中各机制的损失情况进行准确的诊断,对于电池的全生命周期利用至关重要。为此,以更适合于免训诊断的开路电压(Opencircuitvoltage,OCV)老化模型为研究对象,针对其在电池老化后期的表征精度局限,提出面向全生命周期容量损失机制诊断的改进OCV老化模型。新模型充分考虑电池老化后期,活性材料深度损失对电极电势曲线形式的复合影响规律,在现有模型的基础上,通过对其所对应基础电极电势联合坐标系的非均匀压缩扩展,实现对电池OCV全生命老化行为的有效机理描述。为了验证新模型在全生命周期中的有效性,以可用容量衰减至30%的磷酸铁锂电池(Lithium iron phosphate battery,LFP)为试验对象,对其在不同老化程度下开展模型拟合诊断测试。结果表明,在整个生命周期中新模型的RMS误差均被控制在2 mV以内。此外,为了保证新模型在诊断过程中的可靠性,还对其参数可辨识性进行了分析与论证。展开更多
基金Project(51375113)supported by the National Natural Science Foundation of China
文摘Micro radial compression tests were carried out on cylindrical specimens of pure copper polycrystals with different grain sizes. Experimental results indicated that phenomena of decreasing forming force, increasing scatter of forming force and more irregular surface topography occurred with the increase of grain size. A modified surface model based on dislocations pile-up in surface layer grains, and a flow stress scattering formulation based on standard deviation and grain size distribution were proposed to analyze size effects on forming force in micro compression. The inhomogeneous deformation of surface layer grains was discussed by the main deformation manner of rotation. A good agreement with the experimental results was achieved.
文摘This paper provides a review of recent research advances and trends in the area of stability of unstiffened circular cylindrical shells subjected to general non-uniform axial compressive stresses.Only the more important and interesting aspects of the research,judged from a personal viewpoint,are discussed.They can be crudely classified into four categories:(1) shells subjected to non-uniform loads;(2) shells on discrete supports;(3) shells with intended cutouts/holes;and (4) shells with non-uniform settlements.
文摘锂离子电池的容量损失是可循环锂损失机制与多种活性材料损失机制共同作用的结果,整体容量损失相同的电池可能由于各机制占比的不同,呈现出截然不同的剩余生命衰减轨迹。如何对电池老化过程中各机制的损失情况进行准确的诊断,对于电池的全生命周期利用至关重要。为此,以更适合于免训诊断的开路电压(Opencircuitvoltage,OCV)老化模型为研究对象,针对其在电池老化后期的表征精度局限,提出面向全生命周期容量损失机制诊断的改进OCV老化模型。新模型充分考虑电池老化后期,活性材料深度损失对电极电势曲线形式的复合影响规律,在现有模型的基础上,通过对其所对应基础电极电势联合坐标系的非均匀压缩扩展,实现对电池OCV全生命老化行为的有效机理描述。为了验证新模型在全生命周期中的有效性,以可用容量衰减至30%的磷酸铁锂电池(Lithium iron phosphate battery,LFP)为试验对象,对其在不同老化程度下开展模型拟合诊断测试。结果表明,在整个生命周期中新模型的RMS误差均被控制在2 mV以内。此外,为了保证新模型在诊断过程中的可靠性,还对其参数可辨识性进行了分析与论证。
