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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 4 Documents
 1 
Search results for , issue " Vol 15, No 3 (2000)" : 4 Documents clear
KAJI EKSPERIMENTAL PENGARUH WAKTU PENAHANAN CAIR TERHADAP PEMBENTUKAN GRAFIT BULAT PADA PROSES PENGECORAN BESI COR NODULAR 700 Suratman, R; Widodo, R
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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Abstract

Nodular graphite on iron casting can be formed because of the present of Mg element from 0.02% - 0.05%, which is alloyed with iron base material to form FeSiMg through inoculation effect. At the pouring stage, especially in continuous production, Mg in the melting fluid and its inoculation effect decrease so that the formed graphite will not round as expected and certainly weaken its mechanical properties.This writing discuss the maximum holding time for the melting fluid in a ladle to assure acceptable mechanical properties, through experimental analysis of roundness of nodular graphite and tensile strength of the material by casting it in every 2 minutes right after adding the Mg element.By referring to the decreasing Mg, iron fluid can be held up to 100 minutes, provided that the iron fluid contain maximum 0.01% Sulfur and maintained to the lowest holding temperature without ignoring pouring temperature standard for iron, maximum temperature in the ladle set 1400 “C. However, the tensile strength will be decreased to the acceptable value only up to 24 minutes, as a result of refraction of graphite that is affected by decreasing inoculation effect.
FRACTURE BEHAVIOR OF ACRYLONITRILE-BUTADIENE-STYRENE RESIN Husaini, Husaini; Kishimoto, Kikuo
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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Abstract

In this research, mixed mode loading testing of actylonitrile-butadiene-styrene (ABS) resin was carried out by using a compact tension shear specimen which was attached to a special loading device. The angle between the loading axis and the crack surface was varied from 90o (Mode I) to 0° (Mode I1). Two types of ABS resin were examined. The first one (ABS-I) has a butadiene rubber content of 18 wt % in the form of small particles of diameter about 200 nm. The second one (ABS-2) has the same overall butadiene rubber content but a bimodal particle distribution with diameters of 200 nm and 500 nm. Crack initiation and propagation was observed by using a video microscope. The results show that the fracture angle for both materials under mixed mode loading coincides with the values predicted by the maximum hoop stress criterion. To obtain the stress intensity flzctors, numerical analyses of compact-tension-shear specimen were conducted using a two dimensional finite element analysis. Fracture behavior of ABS resins under mixed mode loading was almost the same as that under mode I loading for lower value of mode 11 component. However, for higher mode II component, shear type fracture occurred at initial crack tip.
MODEL HETEROGEN PENGERINGAN BUTIRAN JAGUNG DALAM UNGGUN DIAM Istadi, Istadi; Sitompul, J. P
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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Abstract

This paper deals with one-dimensional dynamic modelling and simulation of deep -bed com drying by two-phase model or heterogeneous model The models consider mass and heat transfer process within grain and drying air phase. This model also considers moisture content and temperature gradient within grain. The coupled of partial differential equations developed, then solves numerically by finite difference with altemating direction implicit method algorithm. The dynamic models predict not only humidity and temperature of outlet drying air, but also grain moisture content and temperature. The simulated profiles are compared with expenmental data, taken from available literature. The models can describe corn grain drying process in deep -bed dryer. However, the model parameters should be modified to get drying characteristic profiles that closed to the experimenal data.
KAJI EKSPERIMENTAL DAN NUMERIK TENTAN G FAKTOR KETANGGUHAN RETAK MODUS I DAN II PADA LAMINATE KARBON/EPOXY SERAT TERANYAM Puja, IGN Wiratmaja; Suratman, Rochim; Ramelan, Aditianto; Prasetia, Hariadi Tri
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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Abstract

This paper presents experimental and numerical analysis on the influence of crack orientations to the fracture toughness of mode I and mode II for woven type carbon/epoxy four ply laminate. The experimental procedure is carried out through off axis tensile test (ASTM D 3039-76) with nine variation of crack orientations i.e. 5°, 10°, 15°, 30°, 45° 65°, 75°, 80°, and 90°. Three rail shear test (ASTM D 4255-83) is utilized for zero degree crack orientation. The stress and strain contours around crack tips are obtained numerically using the finite element method. Numerical and experimental results of the mode I (KI) and mode II (KII) fracture thoughness are presented in graphical form as a function of crack directions. Adopting Wu’s(11) Criteria for unidirectional lamina and Hahn’s[6] Criteria for general anisotropic lamina, a new mixed mode fracture toughness criteria is developed for woven fiber matrix laminate.

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