Recycling waste concrete has become a large problem in developing countries. The aim of this work is to provide guidance for screening particles and improving efficiency. First, the elastoplastic collision model established calculating coefficient restitution with different compressive strengths. Then, bar circular vibrating screen applied simulate process by using discrete element method (DEM)...

Abstract Laser surface hardening is rapidly growing in industrial applications due to its high flexibility, accuracy, cleanness and energy efficiency. However, the experimental process optimization can be a tricky task number of involved parameters, thus suggesting for alternative approaches such as reliable numerical simulations. Conventional laser models compute achieved hardness on basis mic...

The analysis of heat transfer in solid bodies with orthogonal geometries and knowledge thereof, is vast importance different fields engineering research. An important field study the thermal machine-parts that most cases are designed shaped geometries. Nevertheless, due to high complexity cost experiments represent, FEM numerical solutions used foresee on these components. These methodologies c...

Abstract The stress distribution function in the surface layer is created as a result of using measurements on surfaces C45 steel samples after shot peening. Stresses were measured by X-ray diffraction with use PSF-3M device from Rigaku Company. For measuring residual stresses, subsequent layers top material used basis, and these obtained through electrochemical etching. test results i.e. dista...

Bu çalışma kapsamında farklı sonlu elemanlar yaklaşımları kullanılarak on katlı betonarme bir binanın radye temel kalınlıkları ve beton sınıfları değişiminin oturma üzerine etkisi araştırılmıştır. İlk yaklaşımda yapı düşey yükleri, sistemi alan yükü olarak etkitilmiştir. İkinci ise zemin birlikte modellenerek üst yükleri zemine doğrudan aktarılmıştır. İki yaklaşımla elde edilen modellerde 80-10...

Günümüzde silah kullanımı bireysel veya kitlesel olarak artış göstermektedir. Bu artışa paralel endüstrisinde namlu üretim aşamasında önemli gelişmeler yaşanmaktadır. Yaşanan gelişmelerin sonucunda üretiminde kullanılan malzemeler ön plana çıkmaktadır. Namlu gerek fiziksel ve mekanik özellikleri gerekse de ulaşılabilirlikleri sebebiyle çelik tercih edilmektedir. Bununla birlikte malzemesi seçim...

In this study, the modelling of arithmetical mean roughness after turning C45 steel was performed. Four parameters cutting tool geometry were varied, i.e.: corner radius r, approach angle κ, rake γ and inclination λ. After turning, Ra measured. The obtained values ranged from 0.13 μm to 4.39 μm. results experiments showed that surface improves with increasing radius, angle, decreasing angle. Ba...

This article presents an experimental–analytical statistical study of low-cycle fatigue to crack initiation and complete failure. The application probability methods provides for the possibility improving characteristics related structural life justification respective values cyclic loads in design stage. Most studies investigating descriptions or failure do not analyse distribution characteris...

The current study was conducted to identify the most important variables in activation phase of cellulose acetate production. Dry alpha pulp as raw material supplied by a local company with intrinsic properties viscosity equal 926 mL/g and water content 96%. In this regard, variables, including reaction time (T30, T60, T90 min), addition level acetic acid (C25, C35, C45 units per 100 dry cellul...