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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
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Articles 4 Documents
 1 
Search results for , issue " Vol 15, No 2 (2000)" : 4 Documents clear
Studi Eksperimental Hubungan Parameter Proses Pemesinan Wire EDM dengan Kekerasan Permukaan untuk Material AISI 1148 Martowibowo, Sigit Yoewono; Pinandito, Satrio
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

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Abstract

Technology development advances in recent years produce materials having higher strength, complicated shape and high accuracy. These have placed demands on the new technology in machining processes. Non-conventional machining processes are providing effective solutions to the problem mentioned above.Wire EDM machining is one of some non-conventional machining processes which is using wire as tool. The limitation of this technique as also happened with other non-conventional machining processes is a lower rate of material removal comparing to the conventional processes.This study was conducted to obtain data in order to optimize machining condition of medium carbon steel using for die material.
METODA ULTRASONIK UNTUK MENENTUKAN ARAH KRISTAL TUNGGAL BERSTRUKTUR KUBIK Trisnobudi, Amoranto; Sugiharto, Benny
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

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Abstract

Single crystal direction can be determined by x-ray diffraction. The determination of this crystal direction can also be carried out by using ultrasonic method. In this method the ultrasonic wave velocity propagating through the crystal is measured. From this velocity measurement then the crystal direction can be determined. This paper deals with the results of a research about the direction determination of cubic single crystal using ultrasonic wave. There are two methods used, namely graphical method and computer method. These two methods used the same data, i.e. velocity data for all possible direction that has been calculated based on the wave and elasticity theory. In the first method, the data are stored as several graphics whereas in the second method they are stored as database in a computer program. These two methods have shown the same results in aluminum for crystal directions [311], [331], [661], [631] and [611] where the computer method can be carried out quicker than the graphical method.
PENGARUH ARAH SERAT TERHADAP FAKTOR INTENSITAS TEGANGAN PADA UNIDIRECTIONAL LAMINA YANG MENGANDUNG CENTER CRACK Puja, IGN Wiratmaja; Supriyadi, Yedi R
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

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Abstract

This paper presents the stress intensity factor (SIF) analysis for unidirectional fiber-matrix lamina containing center crack under uniaxial loading. Several variables are considered on the influence to the stress intensification factor i.e. fiber direction,θ, crack dimension parameter, 2a/L, fiber and matrix volume fraction, Vf, Vm, fiber and matrix stiffness ration, Ef/Em, and lamina thickness. The stress-strain equations for the lamina are derived using micromechanic approach. The governing equations are solved numerically using the finite element method with triangular type element. The element stifiness matrix is obtained using the polynomial shape functions. The software to calculate stress-strain in the lamina containing center crack is developed. Case studies jor numerical purposes consider the carbon-epoagz lamina with carbon type P-100. Numerical results for carbon epoxy lamina are presented in graphical form of SIF as a fimction of the fiber direction, fiber matrix stifihess ratio and volume ratio, and crack geometry.
PERHITUNGAN PERAMBATAN RETAK PADA LAP-JOINT DENGAN METODE FINITE ELEMENT ALTERNATING Legowo, Dibyo; Juarsa, Husen; P. H, Adirakhmantyo; Padmadinata, Utama H; Suharto, Djoko
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

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Abstract

Metode finite element alternating (FEAM) merupakan salah satu metode untuk menentukan faktor intensitas tegangan pada kasus retak berganda. Metode ini merupakan gabungan dari metode finite element dan solusi analitis untuk kasus retak pada pelat dengan lebar tak berhingga, Penelitian yang dilakukan merupakan penelitian lanjutan yang diterapkan untuk kasus khusus yaitu sambungan susun (lap-joint) yang merupakan salah satu sambungan penting pada struktur pesawat terbang. Untuk itu pada penelitian ini metode finite element alternating dikembangkan untuk geometri pelat berlubang. Penelitian yang dilakukan meliputi pemeriksaan program FEAM pada kasus pelat dengan satu lubang, pelat dengan beberapa lubang dan sambungan susun (lap-joint) untuk menghitung faktor intensitas tegangan (K). Hasil perhitungan K, ini kemudian digunakan untuk perhitungan perambutan retak pada sambungan susun tersebut.

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