Size effects on tensile and fatigue behaviour of polycrystalline metal foils at the micrometer scale
Size effects on tensile and fatigue behaviour of polycrystalline metal foils at the micrometer scale
复制标题
微米尺度多晶金属箔拉伸和疲劳行为的尺寸效应
DOI：
10.1080/14786435.2010.538017
复制
发表时间：
2011-01-01
影响因子：
1.6
通讯作者：
Yan, C.
中科院分区：
文献类型：
--
作者：
Dai, C. Y.;Zhang, G. P.;Yan, C.
研究了微米尺度下不同厚度多晶铜箔的轧制态和退火态的拉伸和疲劳性能。单轴拉伸试验结果表明，随着箔材厚度的减小，轧制箔材和退火箔材的均匀延伸率均减小，而轧制箔材的屈服强度和极限抗拉强度增大，退火箔材的屈服强度和极限抗拉强度减小。对于轧制或退火箔，弯曲疲劳抗力随着箔厚度的减小而减小。变形和疲劳损伤行为的独立箔的特点是作为箔厚度的函数。此外，各种小规模的铜箔的疲劳强度进行了比较，以了解在微米尺度上的金属材料的机械性能的尺寸效应的物理机制。
Tensile and fatigue properties of as-rolled and annealed polycrystalline Cu foils with different thicknesses at the micrometer scale were investigated. Uniaxial tensile testing results showed that with decreasing foil thickness the uniform elongation decreases for both as-rolled and annealed foils, whereas the yield strength and ultimate tensile strength increase for as-rolled foils, but decrease for the annealed foils. For both the as-rolled or annealed foils, bending fatigue resistance decreases with decreasing the foil thickness. Deformation and fatigue damage behaviour of the free-standing foils were characterised as a function of foil thickness. In addition, the fatigue strength of various small-scale Cu foils was compared to understand the physical mechanisms of size effects on mechanical properties of the metallic material at micrometer scales.