Novel Electrical Joints Using Deformation Machining Technology—Part II: Experimental Verification
This is the second part of the paper related to the exploration of deformation machining technology (DMT), originally developed at Bauman Moscow State Technical University, as it may apply to making electrical joints and comparing their performance to bolted and welded electrical joints. The DMT process is used to generate tooth-like profiles on two opposing surfaces that make the electrical joints which are later joined by applying a mechanical load. Part I contained a more detailed explanation of the DMT process and the description of the results of computer modeling of DMT joints in copper and aluminum. This paper provides the experimental results of the mechanical and electrical performance of copper and aluminum DMT joints which were compared to bolted and welded electrical joints of identical geometries. Measurements of tensile strength and electrical resistance, after thermal cycling and short-circuit testing, show equivalent or better performance of copper DMT joints compared with copper bolted and welded joints. In addition, it is observed that copper DMT joints have superior performance when compared with aluminum DMT joints, this was attributed to lesser gap filling and the springback effect that occurs after the mechanical load for making the joint is removed. The computer modeling results reported in Part I of this paper support these observations.
Influence of Deformational Cutting Data on Parameters of Polymer Slotted Screen Pipes
A method for manufacturing polymer slotted screen pipes by the use of deformational cutting (DC) technology is presented in this paper. The slotted macrostructure is created by cutting through the pipe wall without chip removal. These screen pipes can be made from thermoplastic tubular workpieces which can either be standard pipes or have internal longitudinal grooves. Descriptions of the manufacturing method, process kinematics, required equipment, and tool for making slotted screen pipes are given. The influence of tool angles and process parameters on dimensions and accuracy of manufactured through slots is analyzed. The theoretical equations are verified by experimental results.
Study of the distribution of tensions in lap joints welded with lateral beads, employing three dimensional finite elements
This paper investigates the distribution of tensions in lateral beads joining lap welded plates, transmitting forces parallel to the axis of the beads. The research is done along the throat plane of the bead. Finite element technique is employed, doing a three dimensional analysis with volumetric elements, modelling the whole geometry of the joint exactly, i.e., plates and beads. This analysis shows a differential behaviour along the throat plane of the bead, in its length and thickness, noted in the norms, but not considered in structural design.