1,721,481 research outputs found
A theoretical study on electrical and thermal response in resistance spot welding
No full textThe effect of contact resistance including constriction and contamination resistance has been a major hurdle for the thermoelectrical analysis of the resistance spot welding process. In this paper, a simple model was suggested and used for calculating the electrical and thermal response of the resistance spot welding process to investigate the influence of contacting forces on the formation of weld nuggets. The electrode surface of the contact interface was assumed to be axisymmetric and its micro-asperities to have a trapezoidal cross-section. These microasperities were considered as the one-dimensional contact resistance elements in the finite element formulation. The contamination film was assumed to be a nonconducting oxide layer, which is very brittle, so that it is broken to some number of pieces when a contacting pressure is being applied. The crushed films were assumed to be distributed at regular intervals and to conserve their size and number during the welding process. The simulation results revealed that the proposed model can be successfully used to predict the effect of the contact resistance on the electrical and thermal response of the resistance spot welding process
A STUDY ON THE LINEARITY IMPROVEMENT OF A TRIANGULAR PRISM TYPE VIBRATION GYROSOCPE BY OUTPUT FEEDBACK
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Destruction of CFC113 in supercritical and subcritical water
No full textDestruction of 1,1,2-trichlorotrifluoroethane (CFC113) in supercritical and subcritical water was performed over a wide range of pressure at 673 K. The hydrolysis reaction of CFC113 in the supercritical water could lead to complete destruction of CFC113, while the CFC113 destruction below the critical pressure of water was quite low. The Cl- destruction yields were higher than those of F over the whole pressure range including both supercritical and subcritical regions, which implies that the bonding energy of F on the backbone of CFC113 is stronger than that of Cl. The destruction yields represented by two ions were found to have the linear dependency on the reduced water density.This work was support by the Korea Science and En-gineering Foundation and University Awards Program of the Korea Advanced Institute of Science and Technology
On-Line Coordinate Transformation for 3-Dof Artioulated Rebot : Incremental Unite Computation method
No full textPorous Surface Reforming Method for Improving the Bonding Characteristics of Carbon/Epoxy Composite Adhesive Joints
No full textSmart Cure Cycle with Cooling and Reheating for Cocured Metal/composite Hybrid Structure
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