Computer simulation of thermal-strain welding cycles in weldability tests

1997 ◽  
Vol 11 (4) ◽  
pp. 295-298
Author(s):  
B F Yakushin ◽  
A A Khachatyrov ◽  
C Yu Nastich
Author(s):  
D. Yu. Titiov ◽  
S. A. Korolev

The article dwells on the applications of computer simulation techniques to solve specific tasks in manufacturing. The problem under consideration is relevant because these broadly used methods allow us to save a significant amount of time and material resources, which is an important factor in current manufacturing operation conditions.Conducts computer analysis of thermal strain processes occurred when welding a track of the tracked vehicle chain component. Performs a finite-element model of the product, specifies the material and environment properties, the fastening conditions, and the welding modes. Considers three options for laying welds. Based on simulation results, residual displacements, arising in the crest during welding, have been obtained. The most optimal method for laying welds is selected where no further product post-treatment is required.The study shows that computer simulation is an efficient tool to solve the tasks, when their analytical calculating is impossible or in case it is unreasonable to conduct full-scale experiments because of high costs. Varying of different parameters allows us to estimate a quality of developed technology without multiple experiments.


Author(s):  
Kiyomichi Nakai ◽  
Yusuke Isobe ◽  
Chiken Kinoshita ◽  
Kazutoshi Shinohara

Induced spinodal decomposition under electron irradiation in a Ni-Au alloy has been investigated with respect to its basic mechanism and confirmed to be caused by the relaxation of coherent strain associated with modulated structure. Modulation of white-dots on structure images of modulated structure due to high-resolution electron microscopy is reduced with irradiation. In this paper the atom arrangement of the modulated structure is confirmed with computer simulation on the structure images, and the relaxation of the coherent strain is concluded to be due to the reduction of phase-modulation.Structure images of three-dimensional modulated structure along <100> were taken with the JEM-4000EX high-resolution electron microscope at the HVEM Laboratory, Kyushu University. The transmitted beam and four 200 reflections with their satellites from the modulated structure in an fee Ni-30.0at%Au alloy under illumination of 400keV electrons were used for the structure images under a condition of the spherical aberration constant of the objective lens, Cs = 1mm, the divergence of the beam, α = 3 × 10-4 rad, underfocus, Δf ≃ -50nm and specimen thickness, t ≃ 15nm. The CIHRTEM code was used for the simulation of the structure image.


2019 ◽  
Vol 3 (6) ◽  
pp. 723-729
Author(s):  
Roslyn Gleadow ◽  
Jim Hanan ◽  
Alan Dorin

Food security and the sustainability of native ecosystems depends on plant-insect interactions in countless ways. Recently reported rapid and immense declines in insect numbers due to climate change, the use of pesticides and herbicides, the introduction of agricultural monocultures, and the destruction of insect native habitat, are all potential contributors to this grave situation. Some researchers are working towards a future where natural insect pollinators might be replaced with free-flying robotic bees, an ecologically problematic proposal. We argue instead that creating environments that are friendly to bees and exploring the use of other species for pollination and bio-control, particularly in non-European countries, are more ecologically sound approaches. The computer simulation of insect-plant interactions is a far more measured application of technology that may assist in managing, or averting, ‘Insect Armageddon' from both practical and ethical viewpoints.


1978 ◽  
Vol 23 (9) ◽  
pp. 649-650
Author(s):  
ARTHUR M. FARLEY
Keyword(s):  

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