2,850 research outputs found
Study on the simultaneous control of the seam tracking and leg length in a horizontal fillet welding, Part 2: Seam tracking
No full textFor the horizontal fillet welding with one plate in a vertical position, there will be a higher tendency of weld metal falling down rather than for the butt-welding in flat position. Such phenomenon could bring about the overlap or deflection of weld pool, and consequently induce the poor mechanical strength of weldments. Therefore, a precise position control of welding torch in conjunction with the weld qualify plays an important role in welding robot applications. In the present study, an experimental method was proposed for deriving a mathematical model between the leg length and the welding conditions. Finally, an algorithm was proposed for weld seam tracking and improvement of the weld quality. The reliability of the proposed algorithm was evaluated through various experiments, which showed that the proposed algorithm can be very effective for tracking the weld line and simultaneously achieving the sound weld bead
Samuel Amirtham et Cyris H.S. Moon (éd.), The Teaching of Ecumenics., 1987
No full textDe Halleux André. Samuel Amirtham et Cyris H.S. Moon (éd.), The Teaching of Ecumenics., 1987. In: Revue théologique de Louvain, 19ᵉ année, fasc. 4, 1988. p. 501
Prediction of weld defects in horizontal fillet welding using numerical analysis and current measurement
No full text
A thermodynamic description of the Al-Cu-Fe-Mn system for an immiscible medium-entropy alloy design
No full textA thermodynamic description of the Al-Cu-Fe-Mn quaternary system has been developed for the design of highstrength immiscible dual-phase medium-entropy alloys. A new thermodynamic assessment for the Al-Cu-Mn ternary sub-system is performed, covering the entire composition range. Thermodynamic parameters of B2 and AlCuFe_tau and phi phases in the Al-Cu-Fe ternary sub-system are also revised based on a previous description that used different constituent binary descriptions. The reliability of the developed thermodynamic description for the Al-Cu-Fe-Mn quaternary system is experimentally confirmed by designing, fabricating, and analysing the phase structures of Al-Cu-Fe-Mn medium-entropy alloys.11Nsciescopu
A 3D hybrid simulation study of the electromagnetic field distributions in the lunar wake
No full textAs a consequence of its lack of a thick atmosphere and an ionosphere,
the interaction of the solar wind with the Moon is characterized
by the direct impact of the solar wind on its sunward
hemisphere. This absorption effect produces a near-vacuum in the
wake immediately behind the Moon. The absence of a global magnetosphere
and the low electrical conductivity further leads to the
free passage of the interplanetary magnetic field (IMF) through the
lunar interior. This classic scenario of the solar wind�Moon interaction
was established by the very first plasma measurements in the
lunar environment made by the Explorer 35 spacecraft (Lyon et al.,
1967; Schubert and Lichtenstein, 1974). The wake region is gradually
filled in by the diffusion of solar wind protons into the zone of
density depletion. As described in the early analyses by Michel
(1968) and Whang and Ness (1970), the expansion of the solar wind
plasma into the wake is accompanied by rarefaction waves. At the
same time, the magnetometer experiment on Explorer 35 detected
the existence of a field reduction zone at the wake boundary surrounding
the central region, with magnetic field enhancement up
to a factor of 1.4 in comparison to the value in the ambient solar
wind (Colburn et al., 1967). Some of these features were repeatedly
observed at different distances in the lunar wake by the Win
Design of Active Engine Mount and Evaluation of Vibration Control Performance Using Normalized Filtered-X LMS Algorithm
No full textObtaining a Wide-Strain-Range True Stress–Strain Curve Using the Measurement-In-Neck-Section Method
No full textBackground: Measuring true stress?strain curve over a large-strain-range is essential to understand mechanical behavior and simulate non-linear plastic deformation. The digital image correlation (DIC) technique, a non-contact full-field optical measurement technique, is a promising candidate to obtain a long-range true stress?strain curve experimentally. Objective: This paper proposes a method for measuring true stress?strain curves over a large-strain-range during tensile testing using DIC. Methods: The wide-strain-range true stress?strain curves of dual-phase and low carbon steels were extracted on the transverse direction in the neck region. The axial strain on the neck section was estimated by averaging the inhomogeneous deformation on the cross-section of the tensile specimen. The true stress was calculated from the engineering stress and the cross-sectional area of the neck. Results: The validity of the proposed method was assessed by comparing the experimental load?displacement responses during tensile testing with the finite element method (FEM) simulation results. The stress and strain on the neck section estimated using the FEM and DIC, respectively, were proven to satisfy the uniaxial condition and successfully obtained. Conclusions: The experimental results agree well with the FEM results. The proposed concept can be applied to various deformation modes for accurately measuring long-range true stress?strain curves. ? 2021, Society for Experimental Mechanics.11Nsciescopu
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