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Pengaruh Beban Lentur Pada Poros Stainless Steel Terhadap Siklus Kegagalan Fatik fitri, muhamad
Jurnal Teknik Mesin Vol 9, No 3 (2020)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v9i3.9877

Abstract

Salah satu penyebab dari kerusakan pada komponen mesin adalah disebabkan oleh kelelahan, yaitu kegagalan pada material akibat beban/ tegangan berulang – ulang (Cylic stress) meskipun besarnya tegangan tersebut masih di bawah batas kekuatan elastiknya. Karenanya, kelelahan, khususnya pada komponen mesin merupakan sifat yang sangat penting untuk dikaji dan diteliti. Salah satu komponen mesin yang mengalami beban berulang-ulang adalah poros. Akibat beban-beban yang bekerja pada poros meskipun jauh di bawah tegangan luluhnya, poros dapat mengalami kelelahan. Karenanya sebuah poros perlu diuji sifat lelahnya untuk memperkirakan umur poros tersebut saat digunakan nantinya. Pada poros yang berputar ada yang mengalami beben lentur ada yang tidak. Adanya beban lentur pada poros kemungkinan akan menambah pendek umur siklus lelah dari poros. Tujuan dari penelitian ini adalah: Menguji Bagaimana pengaruh beban lentur terhadap umur siklus fatik dari poros Stainless steel SUS 304 untuk kemudian mendapatkan hubungan antara momen lentur yang diberikan dengan umur siklus dalam bentuk persamaan matematis. Pengujian dilakukan untuk 7 macam variasi  beban, mulai dari beban 1kg, 1,5kg, 2kg, 2,5kg, 3kg, 3,5kg dan 4 kg, yang mana beban yang diberikan tersebut akan dirasakan sebagai beban lentur oleh poros. Hasil pengujian ini membuktikan bahwa besarnya beban lentur yang dialami oleh suatu poros stainless steel berpengaruh terhadap umur kegagalan fatik poros tersebut, yang mana, semakin tinggi beban yang diberikan maka umurya semakin pendek. Pengujian spesimen dengan diberi beban terendah sebesar  1 kg yang menghasilkan momen lentur sebesar  0,882 N.m dan tegangan geser sebesar 41,6 Nm, poros dapat beroperasi hingga 32820 siklus. Beban maksimum sebesar 4 kg menghasilkan momen lentur sebesar 3528 Nm, dan tegangan geser sebesar 166,45 N/m² dan kegagalan poros terjadi pada siklus 3702.
GEMBA KAIZEN DAN HUBUNGANNYA DENGAN PENERAPAN SISTEM MANAJEMEN KUALITAS ISO 9001 Fitri, Muhamad
Jurnal Teknologi Elektro Vol 7, No 1 (2016)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1191.903 KB) | DOI: 10.22441/jte.v7i1.816

Abstract

Gemba  kaizen  adalah  budaya  jepang  untuk  melakukan  perbaikan  dan peningkatan  secara  terus  atau  berkesinambungan  di  tempat  kerja.  Budaya  jepang  ini diterapkan  oleh  kebanyakan  perusahaan  jepang  di  dunia.  ISO  9001  sebagai  sistem manajemen kualitas yang dikeluarkan oleh badan Dunia IOS (International Organization for Standardization)  juga menekankan kepada organisasi mulai dari manajemen puncak sampai  ke  level  bawah  untuk  melakukan  peningkatan  berkesinambungan  (Contnuous Improvement),  yang  mana  hal  ini  tertuang  dalam  beberapa  klausul  ISO  9001. Diantaranya  klausul    4.1.f,    Klausul  5.4.1.b,  dan  Klausul  5.4.2.b  serta  ada  satu  kalusul khusus yang membicarakan tentang perbaikan berkesinambungan ini yaitu Klausul 8.5.1. Penelitian  ini  dimaksudkan  untuk  mempelajari  penerapan  gemba  kaizen    serta hubungannya  dengan  penerapan  continuous  improvement  pada  sistem  manajemen kualitas  ISO  9001.  Dari  hasil  penelusuran  literatur  didapat  bahwa  antara  gemba  kaizen dan  Continuous  Improvement  pada  sistem  manajemen  Mutu  ISO  9001  adalah  memang sejalan  sehingga  bagi  organisasi  yang  sudah  menerapkan  gemba  kaizen,  ketika  akan menerapkan  sistem  manajemen  kualitas  ISO  9001  sebenarnya  sudah  lebih  dulu meneruapkan  Continuous  Improvement  pada  Standard  sistem  manajemen  kualitas  ISO 9001, sehingga perusahaan itu akan sangat mudah beradaptasi dengan sistem manajemen mutu ISO 9001 baru diterapkan tersebut. Kata-kata kunci : Gemba Kaizen, ISO 9001, continuous improvement    
THE REGRESSION MODELS OF IMPACT STRENGTH OF COIR COCONUT FIBER REINFORCED RESIN MATRIX COMPOSITE MATERIALS Fitri, Muhamad; Mahzan, Shahruddin
International Journal of Advanced Technology in Mechanical, Mechatronics and Materials Vol 1, No 1 (2020)
Publisher : Institute for Research on Innovation and Industrial System (IRIS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (267.627 KB) | DOI: 10.37869/ijatec.v1i1.12

Abstract

The need of coconuts in Indonesia is relatively high. The use of large quantities of coconuts produces large amounts of organic waste from coco fiber, which tends to become waste if it is not used to be beneficial for humans.One of the potential uses of coconut fiber is as a reinforcement of natural fibers in polymer matrix composite materials. Recently, the applications of composite materials have been expanded widely including structural angine component which whitstand certain load like impact load. But most of them used synthetic fiber. Although the use of natural fibers as reinforcement in composite materials has been widely studied, their use is still limited because natural fibers have their own advantages and disadvantages. The purpose of this study was to measure the impact strength of specimens of coconut fiber reinforced polymer matrix composite material, and to determine the effect of the length and concentration of coconut fiber on its impact strength. A significant and valid regression model was also generated in this research, that states the relationship between fiber length and fiber content of resin matrix composite material to its impact strength. The result shows that the impact strength of the samples were influenced by fiber content and fiber length. The regression models for the impact strength of  resin composite reinforced with coconut fiber is Y = 4.44 +0.180 X1 ? 0.52 X2  Where: Y = Impact Strength (kJ/m2), and X1= Fiber length (mm), and X2= Fiber content (%).
Pengaruh Prosentase Serat Kelapa Sawit Terhadap Umur Fatik Beban Aksial Komposit Matriks Resin Fitri, Muhamad
ROTASI Vol 21, No 4 (2019): VOLUME 21, NOMOR 4, OKTOBER 2019
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.874 KB) | DOI: 10.14710/rotasi.21.4.215-223

Abstract

Palm Oil Industries, not only provide so many benefits, but also has a negative impact in the form of organic waste as by products of palm oil industries. Therefore, the utilization of oil palm fiber waste needs to be developed, including for structural components that retain load, through various studies in order to reduce the volume of waste caused by oil palm. One of the simplest types of load is axial load. The purpose of this study is to make polymer matrix composite materials reinforced with oil palm  fiber, and then test the life cycle of fatigue failure axial load, of polymer matrix composite materials with several different percentages of fiber content. The material used as a matrix is Yukalac® 157 BTQN-EX unsaturated polyester resin (UPRs), and the catalyst uses methyl ethyl ketone peroxide (MEKPO) and Oil palm fibers as reinforcement. The content of palm oil fiber is divided into three level i.e: 3%, 5%, and 7%. The effect of the percentage content of the volume of palm oil fiber on the cycle of fatigue failure of the polymer matrix composite material were analyzed. So that later this palm matrix resin fiber composite material can really be utilized for structural components that retain load. By utilizing palm oil fiber in the production of composite materials, it is hoped that this will reduce the volume of organic waste from palm oil processing. Fatigue testing results on the percentage of palm oil fiber content of 3% obtained the shortest failure cycle life is 7.67 cycles. As for the percentage of palm oil content of 7%, the longest failure cycle was obtained to 18.33 cycles.
Pengaruh Waktu Penahanan pada Perlakuan Panas Paska Pengelasan terhadap Ketangguhan Sambungan Las Baja Fitri, Muhamad; Sukiyono, Bambang; Simanjuntak, Martua Limido
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 13, No 2 (2019): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.13.2.80-86

Abstract

One of the welding methods that is widely used today because it is easier to operate, more practical in its use, can be used for all welding positions and more efficient is called Shield Metal Arc Welding (SMAW). In this welding, the base metal and filler metal will experience thermal cycles which lead to local heating and cooling processes resulting in residual stress and distortion in the material. This residual stress must be removed because it causes a decrease in the mechanical properties of the material. The most widely used method is the thermal method that is by Post Weld Heat Treatment (PWHT). The success of The post-weld heat treatment in removing residual stresses in PWHT is influenced by the holding time. This study aims to examine the effect of holding time on heat treatment, on the weld toughness of steel. In this study, the type of welding used was SMAW welding, the material used was steel AISI 4130, the electrodes used were LB-7018-1 standard application and AWS classification A5.1 E7018-1. The test holding temperature is 650oC. The holding time of testing uses three variables, namely: 2.5 hours, 4.5 hours, 6.5 hours. The Impact testing is done by the Charpy method. From this study, the influence of holding time variation on PWHT holding temperature on the weld strength of AISI 4130 steel was obtained.
Becoming an International Brand: A Case Study of Starbucks Azriuddin, Muhammad; Kee, Daisy Mui Hung; Hafizzudin, Muhammad; Fitri, Muhamad; Zakwan, Muhammad Afiq; AlSanousi, Dalal; Kelpia, Aman; Kurniawan, Olivia
Journal of the Community Development in Asia(JCDA) Vol 3, No 1 (2020): Journal of The Community Development in Asia (JCDA)
Publisher : AIBPM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32535/jcda.v3i1.706

Abstract

This paper aims to investigate how Starbucks becomes the best coffee shop worldwide and how the organization overcomes its challenges and succeed to become an international brand. Starbucks is a popular coffee restaurant from the beginning but has just become a famous brand worldwide. Starbucks has over 20,000 stores in 62 countries around the world. In 1971 Starbucks opened its first store in Seattle’s Pike Place Market. Howard Schultz joins Starbucks as a director of Retail Operations and Marketing. Starbucks focuses on its mission “Inspire and nurture the human spirit-one person, one cup, and one neighbourhood at a time. Starbucks provides a variety of drinks from hot to cold, and foods. The most famous beverage is Frappuccino® Blended Beverages. Starbucks makes a beverage menu depending on the customer's request to meet their satisfaction. Starbucks emphasizes on high-quality service from the store environment to the work environment. Starbucks promotes its products through mass media such as advertising at the television, social media, billboards, and coupon card. The paper concludes with some recommendation.