A PRACTICAL METHOD OF DETERMINING THICKNESS OF PLATES SUBJECTED TO INDIVIDUAL END FORCES

Bu çalışmada, dört ucundan ve orta noktasından kuvvetlere maruz bırakılan bir plak halinde kalınlık hesabına dair analitik bir formül geliştirilmektedir. Metod, federli plak halini de ihtiva edecek şekilde genişletilmektedir. Sonuçlar sadece pres gövdelerinin kalınlık tayini için değil, fakat aynı zamanda daha geniş bir kullanım alanı için de geçerlidir. In this study, an analytical formula is developed for a plate subjected to four forces at its corners and a force at its middle point. This formula is extended so as to include the case of corrugated plates. The results are valid not only for the thickness determination of presses, but also for a wider range of application

EFFECT OF SHAFT AND SHELL SURFACE ROUGHNESS ON BEARING PERFORMANCE IN ELASTOHYDRODYNAMIC LUBRICATION

This study is devoted to the effect of surface roughness on bearing performance. Shaft and shell roughness are both taken into account. For both sides, surface roughness is accounted in the form of sin function and rotation effect of shell roughness involved in the model as well. Evaluation of the results leads to conclusion that increase in total roughness improves the bearing performance characteristics. But some contraints for surface roughness must be considered. Having these constraints existing, it comes out that the relation between performance parameters and surface roughnes can be obtained by an optimization procedure

A NEW APPROACH TO CALCULATION OF THE ELLIPTICAL BEARING OF MULTI-SHEARING-SURFACE

In this study, a new approach is proposed in the calculation of performance characteristics of elliptic bearings of Multi-Shearing-Surface (MSS) type which has widely been used yet. The number of researches available in this area are far below the needs. This paper presents the proposed approach and the performance of bearings without use of superposition

THEORETICAL INVESTIGATION OF A CYLINDRICAL-PISTON SYSTEM FILLED WITH SAND UNDER IMPACT LOADING

Well-known isontropic gas equation has been used in various formulations for several occasions. In this equation, pressure distribution in a cylinder-piston system filled with sand is theoretically found assuming that sand behaves like gases. Some numerical results are also obtained. On the condition that the constant ? is determined experimentally, the results of this paper can also be used in metallurgy

DYNAMIC ANALYSIS OF A VEHICLE CLUTCH

In this study as a first step of an ongoing investigation, a dynamic model was developed to analyse motion and power transmission phenomen in mechanical clutches used commonly in motor vehicles . The control of a driver on clutch and speed pedals was reflected in the model. The movement of clutch disk with constant speed and acceleration can be investigated by using the model. In addition, the control of speeding by driver was included to the model via a certain scenario. During clutch engagement and after, the effects of loading torques in different gears on the time of perfect engagement and on the speed of the vehicle were investigated

Enjeksiyon parametrelerinin cam elyaf takviyeli polipropilen(PP) ve naylon 6 (PA6) kompozitlerin mekanik özelliklerine etkisinin araştırılması.

Bu çalışmada, cam elyaf (E) takviyeli plastik matris kompozit (PMK) malzeme enjeksiyon tekniğiyle üretilmiştir. Cam elyaf, polipropilen (PP) ve naylon 6 (PA6) matris içerisine, ağrılıkça % 15 ve % 30 oranlarında katılmıştır. Takviye elemanı ile enjeksiyon hızı, sıcaklık, arka basınç ve yolluk girişleri gibi enjeksiyon parametrelerinin üretilen PMK malzemelerin mekanik özelliklerine etkileri incelenmiştir. Üretilen numuneler çekme ve darbe deneylerine tabi tutulmuştur. Çekme dayanımının; enjeksiyon hızının artmasıyla azaldığı, besleme bölgesi sıcaklığı ve arka basıncın artmasıyla değişmediği, yolluk geçidinin büyümesiyle bir miktar artığı görülmüştür. Cam elyafın, çekme dayanımını önemli ölçüde (% 100-200) artırdığı görülmüştür

EFFECT OF BEARING MACROGEOMETRY ON BEARING PERFORMANCE IN ELASTOHYDRODYNAMIC LUBRICATION

During manufacturing, ideal dimension and mutual positioning of machine elements proposed in project desing can be achieved only within certain range of tolerances. These tolerances, being classified in two groups, related to micro and macro geometry of machine elements, don't have to effect the functioning of these elements. So, as for all machine elements, investigation of the effects of macro and micro tolerances for journal bearings is important. In this study, we have investigated the effect of macro geometric irregularities of journal bearings on performance characteristics. In this regard, we have studied the change of bearing performance in respect to deviation from ideal circle for an elliptic shaft with small ovality rolling in circular journal bearing

INCLUSION OF A CYLINDER INTO AN AXIALLY LOADED INFINITE PLATE WITH A HOLE

In this paper, inclusion problem in infinite plates is considered. Firstly, inclusion of a cylin-der of radius d into a plate including a hole of radius ri is studied. The case where the cylinder carries twisting moment is also added to the analysis. Secondly, inclusion problem is solved for an axially loaded rectangular infinite plate having a hole of radius ri. In order to find the interface pressure in this case, two methods are proposed. In the first method, the interface pressure is assumed not to depend on the angle ? while it is assumed in the second method that the pressure also depend upon the angle?. The results reveal that stresses can excessively change in the case of inclusion problem, depending upon the value of interface ?/ri

STRESS ANALYSIS IN A ROTATING DISC WITH CONSTANT SURFACE VELOCITY

This study is concerned with the stress analysis of a rotating disc with a constant surface velocity. It is assumed that the mass of the disc is variable and is a function of time. Decrease in angular velocity causes angular acceleration and, therefore, shear stress field. Differential equations of motion for this case are solved analytically and shown that the present study is a generalization of the problem of a disc rotating with constant angular velocity. Stresses occurring in the problem are obtained for different values of surface velocity