Numerical Simulation of Stretch Bending for L-section Aluminum Alloy Profile

Abstract

High precision stretch bending of aluminum alloy profile is the key technology for making car’s frame body. A numerical simulation study on the displacement-controlled process for a typical kind of L-section aluminum alloy profile used in high-speed rail with finite element analysis software is presented. The effect of different friction coefficients, with or without baffle and cover plate on the equivalent stress,strain and cross-sectional distortion are investigated. It is shown that the increase of the friction coefficient can increase the cross-sectional distortion, equivalent stress and strain. The installation of baffle and cover plate can significantly reduce the cross-sectional distortion in the middle section of the profile, and increase the equivalent stress and strain to some extent.

Hierarchically Porous Few-Layer Carbon Nitride and Its High H+ Selectivity for Efficient Photocatalytic Seawater Splitting

“…31 Notably, positive shifts exist in the diffraction peak at 27.4°of V N -HCN and HCN compared with that of BCN, which indicates that the former materials have smaller interlayer distances. 32 Nitrogen adsorption−desorption isotherms of V N -HCN validate that it has a hierarchically porous structure with a surface area of 36 m 2 g −1 , which is larger than those of HCN (19 m 2 g −1 ) and BCN (10 m 2 g −1 ) (Table S1). A pore distribution curve shows that V N -HCN contains both 3 and 20−50 nm mesopores, which is consistent with the porous structure seen by the TEM images (Figure 2e).…”

Alterations in the phytochemical composition and antioxidant activity of Ligustrum robustum according to continuous wet‐ and dry‐heat treatment

“…However, it should be noted that further dry-heat treatment led to a decrease in the levels of linalool, beta-geraniol, and thymol. In addition, gardenoside and oleuropein (Chen et al, 2016;Liu et al, 2017) have antioxidant and hypoglycemic properties, and their levels in SLKDT increased exponentially or 10 times after heat treatment.…”

Pyrolyzed Organic Pigment as Efficient Surface-Dominated Alkali-Ion Storage Anodes

“…Previous reports claimed that pyridinic N and pyrrolic N electrochemically absorb Li + / Na + and enhance the surface-dominant capacity through surface adsorption. 57,58 In the N 1s spectra of both LIBs and SIBs, the sum of areas for pyrrolic N and pyridinic N became larger during fully discharged states than in the pristine states, suggesting that N-containing moieties contributed to the Li + / Na + storage (Figure 5b,e). It is generally accepted that Ocontaining moieties enhance the Li + /Na + storage.…”