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All Journal International Journal of Advances in Applied Sciences Journal of Mathematical and Fundamental Sciences Padjadjaran Journal of Dentistry Jurnal Penelitian Pendidikan IPA (JPPIPA) Mesin
Hadi, Bambang Kismono
Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Earth & Planetary Sciences Education Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health

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PENYERAPAN UAP AIR PADA BAHAN KOMPOSIT CARBON / EPOXY Hadi, Bambang Kismono; Jupriyanto, Jupriyanto; Rusnaedi, Edi
Mesin Vol 12, No 1 (1997)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (282.005 KB)

Abstract

In this paper, moisture absorption process in composite material was analytically and experimentally studied. The environmental condition was 72o C and 85 % RH. During a fixed interval time, the composite specimens were taken out from the experimental chamber and weighted. The weight gain showed that the absorption isoterm profile followed Fick Law andthere was a good agreement between the analytical and experimental results. The average maximum moisture absorption was 0.84 %.
Beban Kerut pada Pelat Sandwich Anisotropik Bambang Kismono Hadi
Journal of Mathematical and Fundamental Sciences Vol. 31 No. 3 (1999)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Suatu metode baru untuk menganalisis kegagalan kerut pada struktur pelat sandwich komposit yang bersifat anisotropic dibahas, baik untuk moda simetri maupun moda tidak simetri. Untuk mendapatkan modus kegagalan ini, modulus geser dan normal transversal bagian inti dimasukkan ke dalam analisis. Pertama-tama, energi regangan total yang terjadi dalam sistem ini akan dihitung, dan dengan menggunakan metode Rayleigh-Ritz, sistem eigen yang didapat akan dipecahkan. Dari hasil yang diperoleh dapat disimpulkan bahwa beban kritis kerut dapat terjadi jauh di bawah beban kritis Euler, sehingga menjadi beban kritis yang lebih berbahaya dibandingkan dengan beban Euler. Beban kerut ini juga terjadi pada panjang gelombang yang jauh lebih pendek daripada beban Euler, sehingga bersifat katastropik. Hasil yang didapat juga menunjukkan bahwa analisis baru ini bersifat umum, yang dapat dipakai untuk menghitung beban kritis Euler maupun beban kritis kerut untuk pelat sandwich komposit anisotropik secara simultan. The Wrinkling of Anisotropic Sandwich PanelsAbstract. A new method to analyze the wrinkling failure of anisotropic sandwich panels was discussed, for both symmetrical and asymmetrical wrinkling. To calculate the wrinkling loads, both shear and transverse normal modulus of the core were included in the analysis. First, the total energy of the system was calculated, and then using the Rayleigh-Ritz method, the eigen-system was solved to get the critical buckling loads. The results show that wrinkling could occur far below their corresponding Euler loads, that make them more dangerous. Wrinkling also contain shorter waves, that may lead to catastrophic failures. The results also show that the new method presented in this article is so general and can be used to calculate both Euler buckling and wrinkling loads of anisotropic sandwich panels simultaneously.
PENYERAPAN UAP AIR PADA BAHAN KOMPOSIT CARBON / EPOXY Bambang Kismono Hadi; Jupriyanto Jupriyanto; Edi Rusnaedi
Mesin Vol. 12 No. 1 (1997)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In this paper, moisture absorption process in composite material was analytically and experimentally studied. The environmental condition was 72o C and 85 % RH. During a fixed interval time, the composite specimens were taken out from the experimental chamber and weighted. The weight gain showed that the absorption isoterm profile followed Fick Law andthere was a good agreement between the analytical and experimental results. The average maximum moisture absorption was 0.84 %.
Finite element procedure to simulate sandwich structure with an auxetic core under impact loading using ABAQUS/Explicit Valdo Pratama; Annisa Jusuf; Arief Yudhanto; Bambang Kismono Hadi
International Journal of Advances in Applied Sciences Vol 12, No 1: March 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v12.i1.pp37-47

Abstract

A sandwich structure with an auxetic core is promising in improving the performance of a sandwich structure by implying an auxetic core as its core to combine the advantages of the two structures, e.g., sandwich structure’s superior ability in flexural and shear resistance, auxetic structure in localizing damage, and densification phenomena. This paper discusses a finite element modeling procedure to simulate a sandwich structure with a heterogeneous re-entrant auxetic core. The material of the face is a unidirectional carbon fiber reinforced polymer (UD CFRP) and the core is polylactic acid (PLA). The model is subjected to a low-velocity impact loading and is run through the ABAQUS/Explicit software. We found that the model we developed here could simulate up to the elastic region and identify which element had failed. However, it could not fully resemble and represent the model from reference, where fracture or damage does not occur. This model can be further improved in its material modeling strategy, especially in the fracture modeling of the composite face with compatible material properties in all required sectors, especially damaged sections, which are strictly necessary.
Centrifugation effect on size distribution of organic dental filler made from glutinous rice flour Takarini, Veni; Asri, Lia Amelia Tresna Wulan; Djustiana, Nina; Hadi, Bambang Kismono
Padjadjaran Journal of Dentistry Vol 34, No 2 (2022): July
Publisher : Faculty of Dentistry Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pjd.vol34no2.40711

Abstract

ABSTRACTIntroduction: Organic fillers made from the green-synthesis process can be utilized in dental treatment due to their non-toxic characteristic of the oral environment. Dental fillers must be smaller to improve their mechanical, physical, and biological properties. Material processing and centrifugation contribute to the size of processed materials. This study evaluates the effect of different centrifugation speeds on the size and distribution of glutinous rice flour as organic dental filler. Methods: This experimental study uses glutinous rice flour suspended in water and then centrifuged at different speeds of 3000 and 6000 rpm compared to untreated glutinous rice flour as control. The particle size was examined using Scanning Electron Microscope (SEM) and Dynamic Light Scattering (DLS). Next, Fourier Transform Infra Spectroscopy (FTIR) and X-ray Diffraction (XRD) were performed to evaluate whether there were structure and crystallinity changes. Finally, the cytocompatibility of fillers was examined by a cell viability test. Results: Centrifugation of glutinous rice flour at 3000 rpm resulted in smaller average size particles, evenly distributed, and higher crystallinity than other groups. There were no changes in functional groups, as shown by FTIR spectra. However, the processed samples were more amorphous compared to the control. Importantly, the processed samples appeared to be non-toxic, with a range of cell viability of 82.75-86.67% after 24 h incubation. Conclusion: Centrifugation speed of 3000 rpm has decreased in size, and a more homogenous particle size of organic filler made from glutinous rice flour. Importantly, it improved the cytocompatibility of particles compared to untreated control. Altogether, we proposed this organic material as a new potential material in the dental application that can be further investigated. Keywords: centrifugation speed; size distribution; organic dental filler; glutinous rice flour
Analysis of the Influence of Adhesive, Geometry, and Manufacturing Processes on Mixed Mode Stress Ratio in Single Lap Shear Adhesive Joint Structures of Aluminum and Composite Plates Kurnia, Asep; Hadi, Bambang Kismono; Syamsudin, Hendri; Suada, Muhamad Giri
Jurnal Penelitian Pendidikan IPA Vol 10 No 11 (2024): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i11.9107

Abstract

In aircraft structures, composite plate joints often present significant challenges. Mechanical fastenings such as pins, bolts, or rivets require holes to be drilled in the plates, which reduces the strength of the laminate due to stress concentrations around the hole edges. These joints frequently become sources of structural failure in aircraft. Therefore, the design of composite plate joints is crucial to maintain structural integrity. Adhesive joints offer several advantages over mechanical joints, including the ability to join two different materials, more uniform stress distribution along the joint, and reduced weight since no bolts or rivets are needed. The most common adhesive joint design is the Single Lap Joint (SLJ), which is popular due to its simple geometry and high structural efficiency. However, the main drawback of the SLJ is load eccentricity, which leads to secondary bending and undesirable normal stresses along the adhesive edges. The hypothesis of this study is that SLJ conditions with optimal shear strength can be achieved through the right combination of adhesive type, bond surface preparation, and joint configuration. This study analyzes the influence of various adhesive materials, joint designs, and manufacturing methods using numerical modeling methods, validated with analytical approaches and ASTM standard testing. Numerical modeling is conducted using the finite element method with a cohesive zone model (CZM) approach to examine stress distribution in various cases, such as the impact of geometry, adhesive thickness, and joint length. The normal and shear stress distribution along the joint is found to significantly affect the strength of the SLJ, highlighting the importance of careful design and material selection in these applications.
Co-Authors Annisa Jusuf Arief Yudhanto Asri, Lia Amelia Tresna Wulan Baehaqi Edi Rusnaedi Fachry Abda El Rahman Kurnia, Asep Nina Djustiana Rusnaedi, Edi Suada, Muhamad Giri Syamsudin, Hendri Valdo Pratama Veni Takarini