ANALISIS KEKUATAN REL KERETA API DENGAN PEMODELAN ELEMEN HINGGA
Rail selection is the most important thing in infrastructure investment planning. Wrong selection will cause expensive and incorrect purpose or low investment but has short lifetime and high maintenance cost will be occurred. On the other side, decision to use simulation by considering the real c...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/1821 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Rail selection is the most important thing in infrastructure investment planning. Wrong selection will cause expensive and incorrect purpose or low investment but has short lifetime and high maintenance cost will be occurred. On the other side, decision to use simulation by considering the real condition is not implemented properly. Dimension selection is implemented but with no accurate calculation. Finite Element Method is commonly used to solve any case we find in technical area. In general, any highly mechanical engineering problem solved by using FEM consumes more time to finish with analytical method, for example in railway structure. Railway structure is elastic and if there is a load given to it, it will create a complicated load distribution pattern. Stress contact between wheel liens and rail is about 30,000 N/cm' and must be transferred to soil lining not more than 6 N/cm2. Analytical theory is needed to examine the feasibility result made by FEM. Geometry choosen in this paper is RIC 54 which commonly used in Indonesia. Rail lie in foundation has modulus foundation, C: 0.6 N/mm3 (stiffed lining). Axle load is 18 tons, maximum deflection is 0.4 mm and maximtun momen is 1.2 x l0' Nmm. Interaction between wheel and rail caused by load will create contact area in elliptical form, with ellipse major axis, a = 6.6 mm and ellipse minor axis, b = 5.2 mm. Stress distribution occurred is semi ellipse in contact area. Stress average in contact area is, p„rear, = 815.1 N/mm2. Rail part which is lied accurately under the loading has safety factor 1.1 based on maximum distorsion energy theory. The stress in the railhead under analytical method is bigger 34 % than FEM and stress in the railfoot is bigger 13 % than FEM. Finally, we have conclusion that FEM is more accurate than analytical method . |
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