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FEM Simulation of Polycarbonate Alloys-made Sheet under a Drop Weight Impact Test: Deformation and Failure Performances M. Nizar Machmud; Zahrul Fuadi
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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This paper presents a study of deformation and failure performances of a plastic sheet made of polymer alloys subjected to drop weight impact of a cylindrical mass with hemispherical tip at a certain velocity by using dynamic explicit finite element code of MSC. Dytran. An available material model in the finite element system, called piecewise linear plasticity, was applied in the simulation for describing the large strain, non-linear behavior of the polymeric materials. Maximum plastic strain failure criterion was used to simulate the impact failure. In the simulation, the mass served as a rigid surface strikes perpendicularly the potential impact region of an arbitrary designed- plastic sheet that was considered in the form of a fully-clamped circular thin plate. Contact between the mass and plate was applied and friction coefficient m between the mass and plate was assumed to be a constant value of 0.3. In order to study effect of the assumed friction coefficient value, additional simulations of the impact test have been performed using m = 0. Some limitations in the use of the material model were illustrated through the analysis of results from two types of tough polycarbonate (PC) alloys: PC/ABS and PC/PBT blends. Impact force-displacement relationships of each alloy were then compared to the test result.

Pengaruh Waktu Tahan pada Perlakuan Panas Pasca Pengelasan terhadap Kekerasan dan Kuat Tarik Baja Karbon ASTM A106 Grade B M. Nizar Machmud; Defri Maulana; - Husaini
Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
Publisher : Jurnal Teknik Mesin Unsyiah

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Experimental investigations to study significant effects of employing a post weld heat treatment (PWHT) technique on mechanical properties of the welded carbon steel have been performed. This paper presents a study on hardness and tensile strength characteristics of a carbon steel A106 grade B welded using shielded metal arc welding (SMAW) method with employing normalizing procedures. With the PWHT technique, heating temperature of the steel, that was set up to 850°C, was then maintained for these following set of holding times: 10, 20 and 30 minutes before cooling. Heating and cooling rates of the carbon steel were also slowly maintained. Investigation results under tension showed that the tensile strength of the carbon steel decreased with increase of the holding time. The best tensile strength was achieved by the carbon steel treated with a holding time for 20 min. Toughness of the carbon steel under tension is also discussed in order to correlate the influence of employing the PWHT technique on their fracture modes. Investigation with Vickers hardness test showed that the Vickers hardness on weld metal, weld line, heat-affected zone (HAZ) and base metal of the welded carbon steel, respectively, decreased and tended to be equivalent with the increase of the holding time.

Pengaruh Penghambatan Kebeningan Kaca Terhadap Kemampuan Transfer Intensitas Cahaya Pada Kaca Muhammad Sayuthi; Ahmad Syuhada; M. Nizar Machmud
Jurnal Teknik Mesin Unsyiah Vol 2, No 2 (2014)
Publisher : Jurnal Teknik Mesin Unsyiah

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The sun is the primary source of energy on the earth, but its light sometimes cause thermal discomfort for humans. The thermal engineering started one in the automotive sector in particular car is to install the air conditioner to lower the temperature of the cabin and use the tranfer window film to block sun light intensity. Testing the proper use of window film to determine the effect of inhibition of the ability to transfer the glass clarity of light intensity on the glass needs to be done to determine what percentage inhibition that has the intensity and the lower the cabin temperature, so the thermal comfort is achieved faster. From the results of the testing were conditioned using Solar ray Collector © PHYWE Systeme GmbH CO.KG. Inhibition obtained with 40% glass has an intensity of 39% and a temperature of 63.20 C, the glass has an intensity of 60% inhibition of 21% and a temperature of 61.90 C, the glass has an intensity of 80% inhibition of 8% and a temperature of 63.80 C. So the use of glass with 60% inhibition is best to accelerate the thermal comfort is achieved.

Complex Eigenvalue Analysis of A Motorcycle Disc Brake Squeal Zahrul Fuadi; Muhammad Nizar Machmud
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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This paper discusses the phenomenon of brake squeal of a disc brake system used at motorcycle with a capacity of 125 cc. The occurrence of disc brake squeal is associated with the dynamic instability of the system with the influence coefficient of friction. The dynamic instability of the system is predicted using finite element complex eigenvalue analysis. The analysis predicted three unstable modes in the frequency range below 5 kHz. The unstable modes occurred at the frequency of 1250 Hz, 1920 Hz, and 2306 Hz. The occurrence of unstable mode is indicated by the presence of positive real part of the corresponding complex eigenvalue. Unstable mode is shown by the occurrence of coupled vibration between eigenvectors of disc and brake pads vibrating at similar frequency which consists of diametral mode of disc and bending modes of pads. The analysis also showed that the unstable condition could occur at a value of coefficient of friction as low as 0.2.

Alternative Fiber Sources from Gracilaria Sp and Eucheuma Cottonii for Papermaking M. Nizar Machmud; Fauzan Fadi; Zahrul Fuadi; Coco Kokarkin
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Private sectors have invested in the technology to grow some Gelidialian red algae families and also tried to convert the algae to pulp and paper over the last few years in order to replace raw materials from wood. Several modern systems with their all complexities which are similar to the wood pulp-based papermaking technology have been offered to overcome any recent issues settle in the converting process. Chemical bleaching agents have even been still a standard treatment that must be established for properly converting the algae pulp to a sheet of paper. In this present work, the two genus of red algae, called Gracilaria and Eucheuma, were simply processed to make pulps without use of any bleaching chemical agents. The potential use of pulps made of the red algae as raw materials for papermaking was mechanically studied by testing the sheets made of the red algae through a tensile test at a room temperature under 20 mm/min according to ASTM D 828-97 (2002). Tensile properties of the proposed algae-based paper sheets obtained under the constant rate are discussed. Tensile properties of the selected wood-based paper sheets obtained under the same condition are also presented in this paper. The results showed that pulps made of the red algae would be the alternative to those of the wood and other natural fibers as raw materials for papermaking. Doi: 10.12777/ijse.6.1.1-10 [How to cite this article: Arham, N.A., Mohamad, N.A.N., Jai, J., Krishnan, J., Noorsuhana Mohd Yusof, N.M. (2013). Application of Response Surface Methodology in Extraction of Bioactive Component from Palm Leaves (Elaeis guineensis). International Journal of Science and Engineering, 6(1),1-10. Doi: 10.12777/ijse.6.1.1-10

Characteristics of Red Algae Bioplastics/Latex Blends under Tension M. Nizar Machmud; Reza Fahmi; Rohana Abdullah; Coco Kokarkin
International Journal of Science and Engineering Vol 5, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Cassava, corn, sago and the other food crops have been commonly used as raw materials to produce green plastics. However, plastics produced from such crops cannot be tailored to fit a particular requirement due to their poor water resistance and mechanical properties. Nowadays, researchers are hence looking to get alternative raw materials from the other sustainable resources to produce plastics. Their recent published studies have reported that marine red algae, that has been already widely used as a raw material for producing biofuels, is one of the potential algae crops that can be turned into plastics. In this work, Eucheuma Cottonii, that is one of the red alga crops, was used as raw material to produce plastics by using a filtration technique. Selected latex of Artocarpus altilis and Calostropis gigantea was separately then blended with bioplastics derived from the red algae, to replace use of glycerol as plasticizer. Role of the glycerol and the selected latex on physical and mechanical properties of the red algae bioplastics obtained under a tensile test performed at room temperature are discussed. Tensile strength of some starch-based plastics collected from some recent references is also presented in this paperDoi: 10.12777/ijse.5.2.81-88 [How to cite this article: Machmud, M.N., Fahmi, R., Abdullah, R., and Kokarkin, C. (2013). Characteristics of Red Algae Bioplastics/Latex Blends under Tension. International Journal of Science and Engineering, 5(2),81-88. Doi: 10.12777/ijse.5.2.81-88

Dampak Penggantian Fe3O4 secara Parsial dengan Abu Sekam Padi (ASP) terhadap Porositas dan Kuat Tekan Keramik Komposit Clay-Fe3O4 Muhammad Nizar Machmud; Zulkarnain Jalil
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 3 (2015): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Berdasarkan kajian pendahuluan diketahui bahwa penggunaan pasir laut dan penggantiannya dengan abu sekam padi (ASP) hingga pada fraksi berat tertentu dalam pembentukan keramik komposit clay belum mampu menunjukkan kuat tekan seperti yang diinginkan. Ditambah lagi karena kandungan Cl-dan SO4- yang bersifat korosif, penggunaan pasir laut tersebut tidak lagi direkomendasikan. Mineral utama dari pasir besi yaitu Fe3O4selanjutnya diajukan sebagai penggantinya untuk memproduksi keramik komposit clay baru. Karena pasir besi merupakan sumber daya alam yang tidak dapat diperbaharui, maka penggunaan mineral Fe3O4 tersebut perlu dibatasi. Selanjutnya, ASP masih dipilih untuk menggantikan Fe3O4secara parsial demi keberlanjutan produksi dari material-material keramik tersebut. Keramik dari komposit clay-Fe3O4/ASP tersebut selanjutnya diperkenalkan dalam makalah ini dan nantinya dirancang sebagai material bagi komponen-komponen yang menerima pembebanan berupa tekan dan juga termal. Dua tipe ASPlalu disiapkan dan selanjutnya dikarakterisasimenggunakan spektrometer X-ray fluorescence (XRF). Tidak terdapat perbedaan yang signifikan pada komposisi kimia dari keduanya. Namun, keduanya memiliki bulk density yang berbeda. Hasil pengujian porositas terhadap material keramik komposit tersebut menunjukkan bahwa penggantian Fe3O4dengan ASP meningkatkan porositas material. Hasilpengujian tekan menunjukkan bahwa meningkatnya berat fraksi dari ASP diikuti oleh penurunan kuat tekan material. Analisis X-ray diffraction (XRD) terhadap material baru tersebut menunjukkan bahwa sebagian besar dari Fe3O4 telah bertransformasi menjadi Fe2O3 dan transformasi tersebut selanjutnya dapat menentukan besarnya porositas dan juga kuat tekan dari material tersebut.

Perawatan Pompa Air untuk Sarana Air Bersih Mushalla Al-Muhajirin Desa Blang Krueng Kabupaten Aceh Besar Suhaeri; Mahdi Syukri; Alfisyahrin; Agus Adria; Syukriyadin; Masri Ali; Nurdin Ali; M. Nizar Machmud; Huzaim; Saiful; Ramdan Halid Siregar
AJAD : Jurnal Pengabdian kepada Masyarakat Vol. 3 No. 1 (2023): APRIL 2023
Publisher : Lembaga Mitra Solusi Teknologi Informasi (L-MSTI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59431/ajad.v3i1.148

Community service activities are carried out to maintain water pumps in the Al Muhajirin Mushalla clean water facility in Blang Krueng Village, Aceh Besar District, to address the problem of the availability of clean water in the area. The project team carried out several stages during the week, including observation, problem identification, planning, implementation, and evaluation. Observations were made at clean water facilities to identify existing problems. The results showed that the water pump used in the clean water facility was damaged and not functioning properly. Therefore maintenance is needed to repair the water pump so that clean water facilities can function properly. After identifying the problem, the team plans to maintain the water pump by replacing damaged components and cleaning the contaminated parts. Clean water facilities in Mushalla Al Muhajirin can function properly after maintenance, and the availability of clean water in the area increases. Evaluation is carried out to determine the success of maintenance. The evaluation showed that the maintenance was successful in increasing the availability of clean water, and the local community felt that this improvement helped. In conclusion, the water pump maintenance project at Mushalla Al Muhajirin succeeded in increasing the availability of clean water. This community service project is expected to inspire and guide other communities in improving their clean water facilities.

Perawatan Pompa Air untuk Sarana Air Bersih Mushalla Al-Muhajirin Desa Blang Krueng Kabupaten Aceh Besar Suhaeri; Mahdi Syukri; Alfisyahrin; Agus Adria; Syukriyadin; Masri Ali; Nurdin Ali; M. Nizar Machmud; Huzaim; Saiful; Ramdan Halid Siregar
AJAD : Jurnal Pengabdian kepada Masyarakat Vol. 3 No. 1 (2023): APRIL 2023
Publisher : Lembaga Mitra Solusi Teknologi Informasi (L-MSTI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59431/ajad.v3i1.148

Community service activities are carried out to maintain water pumps in the Al Muhajirin Mushalla clean water facility in Blang Krueng Village, Aceh Besar District, to address the problem of the availability of clean water in the area. The project team carried out several stages during the week, including observation, problem identification, planning, implementation, and evaluation. Observations were made at clean water facilities to identify existing problems. The results showed that the water pump used in the clean water facility was damaged and not functioning properly. Therefore maintenance is needed to repair the water pump so that clean water facilities can function properly. After identifying the problem, the team plans to maintain the water pump by replacing damaged components and cleaning the contaminated parts. Clean water facilities in Mushalla Al Muhajirin can function properly after maintenance, and the availability of clean water in the area increases. Evaluation is carried out to determine the success of maintenance. The evaluation showed that the maintenance was successful in increasing the availability of clean water, and the local community felt that this improvement helped. In conclusion, the water pump maintenance project at Mushalla Al Muhajirin succeeded in increasing the availability of clean water. This community service project is expected to inspire and guide other communities in improving their clean water facilities.

Penerapan Teknologi Tepat Guna/Sasaran Berbasis Energi Terbarukan di Desa Alue Naga Kota Banda Aceh Masri Ali; Zainal Arif; Syahrizal; Irma Dewi; Elvy Sahnur Nasution; Masri Ibrahim; Nurdin Ali; M. Nizar Machmud; Husni
Kawanad : Jurnal Pengabdian kepada Masyarakat Vol. 1 No. 1 (2022): March
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/kjpkm.v1i1.7

The focus of community service activities in Alue Naga Village is to provide solutions to the problem of limited electrical energy experienced by the people in Acehr. The purpose of community service is to downstream the results of the author's research on renewable energy technology for the island community. This community service method is (1) Training and technical guidance by the implementing team to partners regarding the operation and maintenance of the appropriate technology system that is applied; (2) the application of appropriate technology based on renewable energy in the form of solar street lights and wind power to increase access to electricity. Through technology transfer in this Community Service activity, it is hoped that the implementation of technology will be maintained continuously; The results of community service are the installation of the application of appropriate technology in the form of solar and wind power and increasing public knowledge about appropriate technology which is carried out through training to community youth partners in Alue Naga Village, Banda Aceh City.

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