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All Journal Seminar Nasional Teknik Kimia Kejuangan Indonesian Journal of Chemistry JURNAL SELULOSA Journal of Mechanical Design and Testing (JMDT) METAL : Jurnal Sistem Mekanik dan Termal

Heru Santoso Budi Rochardjo

Departemen Teknik Mesin Dan Industri, Fakultas Teknik, Universitas Gadjah Mada

Author-ID : 2840137

Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

Published : 6 Documents Claim Missing Document

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Articles

Isolasi Nano Selulosa dari Ampas Tebu dengan Proses Blending pada Berbagai Variasi Konsentrasi Lestari Hetalasi Saputri; Romi Sukmawan; Heru Santoso Budi Rochardjo; Rochmadi Rochmadi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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

Studi Pengaruh Perubahan Sudut Head Tube dan Top Tube Pada Rangka Sepeda Balap terhadap Defleksi pada Fork dengan Metode Explicit Dynamics Elemen Hingga Ardi Wiranata; Abdul Arief; Heru Santoso Budi Rochardjo
Journal of Mechanical Design and Testing Vol 1, No 1 (2019): Articles
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Salah satu kriteria keselamatan penumpang pada kendaraan adalah besarnya defleksi yang terjadi ketika terjadi frontal impact pada rangka kendaraan. Besarnya defleksi ini erat hubungannya dengan distribusi energi pada rangka utama kendaraan. Material komposit merupakan material yang ringan dan memiliki kemampuan penyerapan energi yang baik. Penggunaaan material ini dapat diterapkan pada rangka sepeda. Pengujian kekuatan struktur rangka sepeda diperlukan untuk menentukan tingkat keamanan dimana tingkat keamanan tersebut mengacu pada standar EN1481. Salah satu langkah uji struktur rangka dapat dilakukan dengan metode dropmass impact. Metode drop mass impact sesuai dengan standar EN1481 merupakan standar yang dikembangkan oleh Jerman untuk menguji kelayakan sepeda balap. Pada standar ini sepeda balap dikatakan layak jika saat dijatuhkan beban seberat 22.5 kg dari ketinggian 212 mm, deformasi permanen yang terjadi pada fork stainless steel tidak melebihi 15 mm dan frame sepeda tidak mengalami keretakan. Metode yang dipilih dalam melakukan pengujian ini adalah dengan menggunakan metode numerik FEA (Finite element analysis) Explicit dynamics. Pada penelitian ini, frame sepeda standar akan dilakukan modifikasi pada head tube angle (HTA) dan top tube angle (TTA). Pada bagian HTA akan dibuat 6 variasi sudut yaitu 69O – 76O, sedangkan pada TTA dilakukan variasi 6 sudut yang berkisar antara 70O – 86O. Dari hasil simulasi diketahui bahwa defleksi maksimum pada bagian sambungan fork dengan head tube adalah 7.89 mm (HTA= 71.8O) dan pada variasi TTA didapatkan nilai maksimum defleksi sebesar 6.87 mm (TTA= 70O). Dari hasil simulasi juga diketahui bahwa perubahan sudut dibawah 20O baik pada HTA maupun TTA pada rangka sepeda relatif tidak mempengaruhi kekuatan dari rangka sepeda balap.

Analisa Ketelitian Gerak Sumbu X Ekstruder Mesin Fused Deposition Modeling dan Kualitas Hasil 3D Printing Menggunakan Bahan Polylactic Acid (PLA) Ahmad Taufiqur Rohman; Heru Santoso Budi Rochardjo; H Herianto
Journal of Mechanical Design and Testing Vol 2, No 1 (2020): Articles
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Fused Deposition Modeling (FDM) merupakan teknologi additive layer manufacturing (ALM) yang bekerja dengan cara ekstrusi material. Material yang digunakan adalah polylactid acid (PLA). Tantangan penggunaan teknologi FDM antara lain kualitas dimensi benda hasil uji printing. Oleh karena itu dilakukan penelitian yang bertujuan untuk mengetahui besar akurasi gerak ekstruder mesin FDM dan ketelitian dimensi benda hasil uji printing pada mesin FDM. Pengaruh optimasi kontrol pada mesin FDM akan dilihat pengaruhnya terhadap akurasi gerak mesin FDM dan ketelitian benda uji.Penelitian dilakukan pada sumbu gerak ekstruder mesin FDM. Metode penelitian dengan cara pengukuran akurasi under no load pada mesin FDM dan divalidasi menggunakan pengukuran ketelitian dimensi hasil uji printing. Pengukuran under no load menggunakan laser interferometer sedangkan pengukuran dimensi benda uji printing menggunakan mesin CMM. Parameter kecepatan dan proses printing ditetapkan pada nilai tertentu. Optimasi kontrol dilakukan dengan penambahan step/unit motor 80,1 dan 80,2.Perbedaan hasil pengukuran under no load dan pengukuran ketelitian dimensi pada hasil printing banyak dipengaruhi oleh faktor shrinkage material. Kompensasi kontrol dapat meningkatkan ketelitian dimensi sebesar 0,145 mm. Mesin FDM yang diteliti dapat menghasilkan ketelitian dimensi produk sebesar 0,157 mm dengan nilai ketidakpastian dibawah + 0.050 mm.

Cellulose Microfibers from Salacca Midrib Fiber Isolated by the Mechanical Treatment Venditias Yudha; Ferriawan Yudhanto; Heru Santoso Budi Rochardjo; Satriawan Dini Hariyanto
JURNAL SELULOSA Vol 11, No 01 (2021): JURNAL SELULOSA
Publisher : Center for Pulp and Paper

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25269/jsel.v11i01.319

Salacca midrib fibers are abundant natural waste in Turi, Sleman Regency, Daerah Istimewa Yogyakarta. Cellulose Microfibers from the salacca midrib fiber has been isolated by mechanical treatment and successfully has good physical characteristics. Cellulose fibers with micro sizes can strengthen the bond effect between the matrix and the fiber due to the vast contact area. The method for isolated cellulose microfibers by mechanical treatment for speed rotation of 5000, 10000 and 15000 rpm. Mechanical stirrer treatment aims to fibrillation and reduces fiber dimensions because of their high rotation. The characterization by XRD, FTIR, and SEM. The XRD results showed that the mechanical stirrer treatment did not damage the crystallinity index of cellulose microfibers. The crystallinity index of the raw material is 64.3%, increased to 79.1% for the microfiber cellulose crystallinity index. Identification of functional groups using FTIR did not show changes in cellulose compounds resulting from mechanical treatment. Morphological observation of fibers by SEM shows that the diameter cellulose microfibers size obtained from salacca midrib fiber ranges 5-10 µm with 100-300 µm in length. Cellulose microfibers have potential materials as reinforcement in the micro composite and extraction into nanocellulose materials.

The Effects of the Blending Condition on the Morphology, Crystallinity, and Thermal Stability of Cellulose Microfibers Obtained from Bagasse Romi Sukmawan; Lestari Hetalesi Saputri; Rochmadi Rochmadi; Heru Santoso Budi Rochardjo
Indonesian Journal of Chemistry Vol 19, No 1 (2019)
Publisher : Universitas Gadjah Mada

In this study, cellulose microfibers were isolated from bagasse fibers in three stages. Initially, the fibers were treated with 5 wt.% NaOH solution followed by bleaching with 5 wt.% H2O2 in an alkali condition (pH 11) to remove hemicelluloses and lignin. Whole cellulosic fibers were obtained by mechanically separating the fibers using a modified kitchen blender to produce cellulose microfibers. Morphological (Scanning Electron Microscopy (SEM)) and structural analysis of the treated fiber was performed using Fourier Transformed Infrared (FTIR) spectroscopy and X-ray Diffraction (XRD). Morphological characterization identified that the diameter of the fibers varied between 20 nm to 20 µm and the FTIR analysis demonstrated that the treatments resulted in the gradual removal of lignin and hemicelluloses from the fiber. Furthermore, the XRD studies revealed that the combination of the chemical and mechanical treatment is an effective way to increase purity of cellulose (removal of amorphous lignin and hemicellulose) and break down the microfiber into shorter crystalline parts with higher crystallinity (77.25%) than raw bagasse (40.54%). Accordingly, changing the agitation time revealed that the cellulose crystallite size in the sample varied slightly with agitation time by using a blender (3.35 nm). Finally, the higher crystallinity and crystallite size improved the thermal stability of the cellulose microfiber confirming their suitability in the manufacturing biomaterial composites.

Evaluasi Frame Sepeda saat Tabrakan Dengan Metode Ekplisit Elemen Hingga Ardi Wiranata; Abdul Arief; Heru Santoso Budi Rochardjo
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 1 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

In this paper, numerical method of crash impact by using explicit dynamic model was used to evaluate the bike frame design. Frontal impact simulation model was carried out to understand the characteristics of energy absorption, stress distribution and deformation of the bike frame. Carbon fiber T300 composite with elasticity modulus 129,79 GPa and overall frame weight is 1,8 kg was used in this simulation as material properties. Hashin damage criteria was used in this numerical analysis since this criteria was widely used to assess composite material damage simulation. In this study Head Tube angle (HTA) and Top Tube Angle (TTA) was modified. The modified HTA was varied from 69O to 76O and TTA was 70O to 86O. This modification was based on the original frame design which the HTA and TTA are 71.5O and 74O respectively. This modification was aimed to find the effect of HTA and TTA modification to energy absorption and stress distribution in the bike frame design. Simulation result shows that TTA and HTA modification affect the energy absorption of the bike frame. The smaller the energy absorption of the bike frame shows that the frame has poor quality of stress distribution.

Co-Authors Abdul Arief Abdul Arief Ahmad Taufiqur Rohman Ardi Wiranata Ferriawan Yudhanto Herianto . Lestari Hetalasi Saputri Rochmadi Rochmadi Rochmadi Rochmadi Romi Sukmawan Saputri, Lestari Hetalesi Satriawan Dini Hariyanto Yudha, Venditias

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