The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray(5 wt% Na Cl solution). A formation model of γ-Fe OOH and a transform...The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray(5 wt% Na Cl solution). A formation model of γ-Fe OOH and a transformation model describing the conversion of γ-Fe OOH to α-Fe OOH were constructed. The results indicated that, at the initial corrosion stage, the corrosion resistance was gradually improved with the addition of Cr; however, with the addition of alloying element V, the corrosion resistance decreased. These results were attributed mainly to the initial corrosion stage being closely related to the matrix microstructure parameters such as grain-boundary character and dislocation density. After the rust layer was formed at a later corrosion stage, the corrosion resistance was reinforced with the addition of Cr and V because Cr strongly influenced the composition, structure, and morphology of the corrosion products. The results presented herein show that Cr was conducive to the transformation of γ-Fe OOH into α-Fe OOH. Moreover, V and Cr exhibited obvious synergy and were enriched in the inner layer of the corrosion products.展开更多
利用环形弹簧的缓冲和减震能力,提出一种具有自复位作用的环形弹簧阻尼器(Ring spring damper,RSD),将其用于钢框架结构的被动耗能减震。阐明RSD的构造特征和基本工作原理,建立了其恢复力模型。使用C++计算机语言在开源有限元程序OpenS...利用环形弹簧的缓冲和减震能力,提出一种具有自复位作用的环形弹簧阻尼器(Ring spring damper,RSD),将其用于钢框架结构的被动耗能减震。阐明RSD的构造特征和基本工作原理,建立了其恢复力模型。使用C++计算机语言在开源有限元程序OpenSees中,开发了RSD材料模型,将其赋予OpenSees中的单元可实现RSD的高效数值模拟。利用已有的试验结果验证了该建模方法的合理性和正确性。进而,将RSD应用于某钢框架结构的减震研究,基于OpenSees建立了该RSD减震钢框架数值模型,开展了抗震弹塑性时程计算。计算结果表明,设置RSD后,减震结构的位移响应较原始结构有明显降低,RSD减震系统表现出良好的地震防护效果。展开更多
基金financially supported by the National Natural Science Foundation of China (No.51474031)
文摘The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray(5 wt% Na Cl solution). A formation model of γ-Fe OOH and a transformation model describing the conversion of γ-Fe OOH to α-Fe OOH were constructed. The results indicated that, at the initial corrosion stage, the corrosion resistance was gradually improved with the addition of Cr; however, with the addition of alloying element V, the corrosion resistance decreased. These results were attributed mainly to the initial corrosion stage being closely related to the matrix microstructure parameters such as grain-boundary character and dislocation density. After the rust layer was formed at a later corrosion stage, the corrosion resistance was reinforced with the addition of Cr and V because Cr strongly influenced the composition, structure, and morphology of the corrosion products. The results presented herein show that Cr was conducive to the transformation of γ-Fe OOH into α-Fe OOH. Moreover, V and Cr exhibited obvious synergy and were enriched in the inner layer of the corrosion products.
文摘利用环形弹簧的缓冲和减震能力,提出一种具有自复位作用的环形弹簧阻尼器(Ring spring damper,RSD),将其用于钢框架结构的被动耗能减震。阐明RSD的构造特征和基本工作原理,建立了其恢复力模型。使用C++计算机语言在开源有限元程序OpenSees中,开发了RSD材料模型,将其赋予OpenSees中的单元可实现RSD的高效数值模拟。利用已有的试验结果验证了该建模方法的合理性和正确性。进而,将RSD应用于某钢框架结构的减震研究,基于OpenSees建立了该RSD减震钢框架数值模型,开展了抗震弹塑性时程计算。计算结果表明,设置RSD后,减震结构的位移响应较原始结构有明显降低,RSD减震系统表现出良好的地震防护效果。
