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Satryo Soemantri B
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Mechanical Engineering

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PENGARUH ARAH SERAT DAN SUSUNAN LAPISAN TERHADAP FAKTOR KONSENTRASI TEGANGAN PADA KOMPOSIT LAMINATE CARBONIEPOXY AS4/3501-6 BERLUBAN G LIN GKARAN DAN ELLIPS IGN Wiratmaja Puja; Satryo Soemantri B; Budi Riyanto
Mesin Vol. 13 No. 2 (1998)
Publisher : Mesin

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Abstract

In recent years, fiber-matrix composite laminates have been widely used in mechanical structures. Due to functional design requirements, the laminates may contain holes that could cause stress concentration. Unlike isotropic plate, where the stress concentration depend upon geometric parameter and loading conditions, stress concentration factor of fiber-matrix composite is also depend on the anisotropic properties such as fiber direction and angle ply. This paper present intensive studies of the influence of the fiber direction and angle ply to the stress concentration factors for composite laminate containing circular and elliptical hole under uniaxial loading. The stress concentration factor curves are presented for various angle ply, fiber direction, and geometric parameter. These curves could be used by designer to obtain the optimum design of laminate structure containing hole.
OPTIMASI STRUKTUR UNTUK MENDAPATKAN FREKUENSI ALAMI YANG TERPISAHKAN SECARA OPTIMAL Satryo Soemantri B; I Wayan Suweca; Endra Sujatmika
Mesin Vol. 13 No. 3 (1998)
Publisher : Mesin

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In obtaining the dynamic response of a dynamic system, its uncouple modal equation of movement simplifies the usage of superposition modal method. This paper proposes a strategy to obtain the uncouple modal equation based an hypotheses of Basile : "Although the presence of modal-damping-couple, the modal equations of movement are dynamically uncoupled for a structure having small damping coefficient if its natural frequencies are well-separated"(1). This hypotheses is justified by several authors, i. e. by Hasselman(1). Thus, by separating the natural frequencyof a dynamic system using Hasselman criteria, it is expected that the modal equation of movement will become uncoupled. The separation of the natural fiequency is done by optimization method which is conducted by using the finite element software ANSYS.
Co-Authors Budi Riyanto Endra Sujatmika I Wayan Suweca IGN Wiratmaja Puja