To apply the design concept of regional design, excavate the typical culture of Chongqing for the current design, and endows the cultural elements and symbols that have lasted for…
Abstract
To apply the design concept of regional design, excavate the typical culture of Chongqing for the current design, and endows the cultural elements and symbols that have lasted for a long time with a new flavor of The Times, firstly, the design concept of regional design is introduced to present and analyze typical regional cultural elements of Chongqing. Then, the cultural appeal and social influence of the design of Chongqing rail transit are analyzed, and the main entry point of the design is summarized to provide theoretical reference and method guidance for the subsequent design. Finally, after completing the theoretical framework, typical case analysis and the reference of design techniques, the design procedure of rail vehicles with Chongqing regional culture is proposed, and the shape design, exterior design and the interior design are completed, which have certain guiding significance for the regional characteristics of rail transit construction in Chongqing.
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Wei Zhang, Hongqun Liu, Minglei Hu and Wei Wu
This paper aims to make clear the sensitive zone of subsea pipeline to stress corrosion cracking (SCC) under a disbonded coating.
Abstract
Purpose
This paper aims to make clear the sensitive zone of subsea pipeline to stress corrosion cracking (SCC) under a disbonded coating.
Design/methodology/approach
The change of microenvironment under a disbonded coating in artificial seawater was analyzed by using a rectangular crevice cell. The SCC behavior of subsea pipeline was studied by slow strain rate tensile tests.
Findings
The microenvironment at the crevice bottom exhibits obvious acidification, Cl- aggregation and cathodic protection potential (CP) rise. Accordingly, the susceptibility of X70 steels to SCC is high due to the intensive anodic dissolution effect. At the opening, hydrogen atom can access into the steel and induce hydrogen embrittlement effect on account of the applied over-protected CP potential, resulting in a relatively high susceptibility to SCC. The corrosiveness of the microenvironment at crevice middle, however, is mild with proper CP potential; thus, the susceptibility of X70 steel to SCC here is lower than that obtained at the opening and the crevice bottom.
Originality/value
A rectangular crevice cell is built to survey the microenvironment evolution under a disbonded coating in situ. The sensitive zone of subsea pipeline to SCC under a disbonded coating is clarified.