Analysis of flow around the high-speed body with an irregular shape (such as fragments/shrapnels formed after the detonation of high explosive projectiles) was performed using the method of numerical simulations. For supersonic motion regime, pressure and velocity flow fields, as well as the formation of shock waves, around an irregularly shaped body were analyzed. Also, streamlines around an irregularly shaped body moving through the atmosphere were visualized (Ansys Fluent) and analyzed.
The paper presents an approach to path planning of industrial robot based on the exchanging the signals between its virtual geometric and kinematic models. The proposed approach is applied to an example of parallel robot ABB IRB 360 in a working environment. It has a parallel structure and is capable of very fast pick and place and assembly operations. The kinematic model has been developed in BondSim environment. The virtual 3D model is created using VTK 3D models of the robot parts by importing stl files of the parts from official ABB web site. The 3D model was created in BondSim3D Visual program environment. Validation of the proposed approach was done by simulation. During a simulation runs these two models exchange necessary information.
Cemented carbides are hard materials used in tough materials machining as well as in situations where other tools would wear away. These are one of the most successful composite engineering materials ever produced. The advantage of cemented carbides is that their structure and composition can be engineered to have properties tailored to specific applications and operations. These materials allow faster and more precise machining and will leave a better surface finish. Carbide tools can also withstand higher temperatures than standard high speed steel tools. Considering their application and known range of properties, main disadvantage of cemented carbides is appearance of their sudden fracture during machining process. This is caused by the low toughness at dynamic rates and overcoming this problem is yet to be researched further. In order to understand these limitations and provide suggestions for the improved design of the material, combined experimental and numerical analysis is currently being performed. Cohesive strength values numerically determined using Dugdale cohesive zone model are compared to flexural strength obtained experimentally. Reduction in flexural strength was then analysed and explained, relating it to the flaw size on the tensile surface of the specimen.
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