Hot stamping of the ultra high strength steel (UHSS) was studied to meet the requirements of lightweight of automobile. The coupled thermo-mechanical model for hot stamping was established with ABAQUS. Initial temperature of tools (die, punch, blank holder) and stamping speed were studied to insure the impact on the thickness, stress and strain of blank. It shows that punch fillet area is easy to crack. With the temperature of tools increasing, the sheet minimum thickness increases first and then decreases. With the increase of punch velocity, the sheet minimum thickness increases. Compared with the initial temperature of tools, punch velocity has a greater impact on the thickness. The simulation results are in agreement with the experimental results and provide a theoretical basis for the practical stamping process.
The warm forming technology is applied to improve the dual phase (DP) steel tailor-welded blanks (TWBs) forming properties. In this paper, the warm deep drawing of DP590 steel TWBs was studied by both the experimental approach and the finite element analysis. The results indicated that the formability of the DP steel TWBs could be reduced slightly at lower temperatures and improved significantly at elevated temperatures. The reasonable punch force and blank holder force decrease rapidly as increasing temperature. Finite element analyses were performed to predict the formability of the warm deep drawing of DP590 steel TWBs and to investigate the rules of the warm deep drawing. The numerical simulation results are in good agreement with experimental results.
Based on the difference of wave impedance between sand layer and surrounding rock, the seismic wave numerical simulation software, Tesseral-2D is used to establish the sandstone formation model containing water, oil and gas respectively, and the three models are treated by post-stack time offset under the conditions of defined channel spacing, wavelet frequency and wave velocity of different rock mass, and the root means square amplitude difference attribute profile under the condition of water-filled oil-filled and gas-filled oil-filled is obtained. From this, it can be obtained that after oil-gas substitution occurs in weak non-mean reservoirs, the root-mean-square amplitude difference from the reservoir to the lower part of the reservoir experiences a mutation process from a positive maximum to a negative maximum, while after oil-water substitution, the root-mean-square amplitude difference from the reservoir to the lower part of the reservoir experiences a mutation process from zero to a positive maximum. For a strong heterogeneous reservoir. Therefore, for Weak inhomogeneous media similar to tight sandstone, the root-mean-square amplitude difference attribute can be used to detect the distribution of fluid in the actual gas drive or water drive oil recovery process.
With the development of society, the demand of coal resources is increasing. However, the deformation and damage of buildings above goaf, which caused by underground mining, is getting worse and worse. Therefore, research and design of anti-deformation of buildings above goaf have certain positive role to deal with problems caused by mining deformation. This paper mainly discusses the double plate foundation used in buildings above goaf, and compares the anti-deformation effect of double plate foundation and strip foundation based on numerical ansys of the both.
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