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Local head loss coefficients of the 90°-bend pipeline for Hydraulic calculation in engineering is empirical value and formula normally experimentally. The values may vary about 2 to 4 times because of the different experimental conditions. This will bring large error for the accurately calculation of the local head loss. Numerical simulation was applied on the pipe with 90° bend that widely used in...
In order to realize numerical simulation of hot rolling and establish the hot deformation process parameters for X80 pipeline steel, the flow stress behavior of X80 pipeline steel during hot deformation was investigated in the temperature range of 900-1100°C and strain rate of 0.01-1s-1 on Gleeble-3500 thermo-simulation machine. The results show that dynamic recover and dynamic recrystallization occur...
To solve additional local waviness of uncoiled strip caused by local high spot, the destabilization waviness model was established, and the critical destabilization value of additional local waviness was deduced based on strip energy theory and local high spot layers stress model. The influence of local high spot on additional local waviness of uncoiled strip was quantitatively analysed by numerical...
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