排序方式: 共有19条查询结果,搜索用时 15 毫秒
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Recent developments in explosive welding 总被引:1,自引:0,他引:1
Explosion welding (EXW) is one of the joining methods consisting of a solid state welding process in which controlled explosive detonation on the surface of a metal. During the collision, a high velocity jet is produced to remove away the impurities on the metal surfaces. Flyer plate collides with base plate resulting in a bonding at the interface of metals. The metal plates are joined at an internal point under the influence of a very high pressure and causes considerable local plastic deformation at the interface in which metallurgical bonding occurs in nature and even stronger than the parent metals. Similar and dissimilar materials can be joined by explosive welding. In this paper, after detection the theories of welding and wave formation, experimental research and numerical studies on explosive welding are reviewed for the last four decades. Also, future developments in explosive welding are predicted and criticized in an outlook. 相似文献
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Mahiye Uluyagmur Ozturk Ayse Rodopman Arman Gresa Carkaxhiu Bulut Onur Tugce Poyraz Findik Sultan Seval Yilmaz Herdem Aslan Genc M. Yanki Yazgan Umut Teker Zehra Cataltepe 《Intelligent Automation and Soft Computing》2018,24(4):891-905
Emotion recognition behavior and performance may vary between people with major
neurodevelopmental disorders such as Autism Spectrum Disorder (ASD), Attention Deficit
Hyperactivity Disorder (ADHD) and control groups. It is crucial to identify these differences
for early diagnosis and individual treatment purposes. This study represents a
methodology by using statistical data analysis and machine learning to provide help to
psychiatrists and therapists on the diagnosis and individualized treatment of participants
with ASD and ADHD. In this paper we propose an emotion recognition experiment
environment and collect eye tracker fixation data together with the application log data
(APL). In order to detect the diagnosis of the participant we used classification algorithms
with the Tomek links noise removing method. The highest classification accuracy results
were reported as 86.36% for ASD vs. Control, 81.82% for ADHD vs. Control and 70.83%
for ASD vs. ADHD. This study provides evidence that fixation and APL data have
distinguishing features for the diagnosis of ASD and ADHD. 相似文献
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Investigation of explosive welding parameters and their effects on microhardness and shear strength 总被引:2,自引:0,他引:2
The aim of this study was to investigate the strength of explosive welded metals with the same chemical compositions. Different welding interfaces (straight, wavy and continuous solidified-melted) were used with changing explosive welding parameters [stand-off distance (s), explosive loading (R) and anvils]. Joined metals were investigated under heat-treated and untreated conditions. Results on the microstructure, microhardness, tensile shear strength and bending tests are reported. According to the experimental results, the effect of the anvil on the explosive welding process was only the joining or not-joining performance. It was shown that the bonding interface changed from a straight to a wavy structure when the explosive loading and stand-off distance were increased. For wavy interfaces, when the explosive loading was increased the wavy length and amplitude increased. Results of tensile shear and bending tests showed that heat-treated specimens have more strength than untreated samples. According to tensile shear test results, straight and wavy interfaces had similar strength. In addition, in bending tests of untreated specimens it was shown that the bending zone had some cracks. 相似文献
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Brake linings used in automotive disk brakes are usually made of various components such as phenolic resin, Cu powder, BaSO4, Al2O3, etc. In this study, 20 specimens with different compositions of the components were manufactured and a pad-on-disc-type wear tester was used. Friction and wear characteristics of the specimens next to a disk made of cast iron were studied. In addition, micro-structural characterisation of braking pads was carried out using SEM and also the effect of temperature on behaviour of the pads was investigated at the temperatures of 50–400 °C and pressure of 1050 and 3000 kPa. Finally, the effect of environment on the pads was investigated in water, salty water, oil and braking liquid media. 相似文献
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Salih Hakan Yetkin Huseyin Unal Fehim Findik 《Polymer-Plastics Technology and Engineering》2013,52(5):433-439
In this study, PP and Talc/EPDM/PP composite materials are used. Foaming process is achieved by a conventional injection molding method. The influence of injection pressure and melting temperature on the average cell dimension, cell number, skin layer thickness, foam density and mechanical properties of investegated foam materials were evaluated. It is observed that cell density is increased by the increment of injection pressure. However, the values of skin layer thickness, density, cell diameter and charpy impact strength are decreased. In addition, the values of skin layer thickness, cell density, density and impact strength are increased with the increment of melting temperature. 相似文献