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Dewi Izzatus Tsamroh
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Merdeka Malang
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Analysis of Energy Absorption of Soft Body Armor with Experimental Method and Finite Element Method Using STF (Shear Thickening Fluid) Composite Material Agus Dwi Putra; Dewi Izzatus Tsamroh; Bella Cornelia Tjiptady
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.10248

Abstract

Body armor is personal protective equipment or shield clothing for soldiers that has existed since Roman times until now. The function of body armor is to protect the body from attacks by foreign objects by absorbing energy. Body armor must have ballistic resistance and stabbing resistance, however, body armor that is often found usually has a high anti-ballistic level but is low in receiving stabbing attacks. STF (Shear Thickening Fluid) is a composite material which is unique in that the viscosity level can change in a way that causes the liquid dispersion to become solid and allows for increased stabbing resistance. This research began by making Kevlar samples which were then mixed with STF and then subjected to tensile testing to obtain material properties that were useful for simulating with FEM. The simulation is intended to analyze the rate of energy absorption that occurs in the sample. The results show that the kinetic energy absorption rate of the bullet is absorbed at a viscosity of 87%. The small energy that occurs is also absorbed in the form of frictional resistance with a value of 11.9%. The identified comparison results show that in cases 1-3 the percentage of viscosity is high so it is viscous, whereas in case 4 the direct reflection of the viscosity is low so it is close to liquid.
Hardness enhancement of Al-Si alloys from sand casting with runner variations Tsamroh, Dewi Izzatus; Ardiansyah, Mochammad Fachrizal; Yaqin, Mohammad Ainul; Shiddiqy, Taqiyyudin Ahmad As; Lubis, Didin Zakariya
JURNAL MECHANICAL Vol 15, No 2 (2024): JURNAL MECHANICAL
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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

Abstract

Metal casting is one of the oldest and most efficient manufacturing techniques in producing metal components with complex shapes. One of the main challenges in the casting process is controlling the flow of molten metal so that it can fill the mold perfectly without producing defects. The channel in the casting mold is usually called a runner. The runner functions as a distribution channel for molten metal into the mold cavity. Optimal runner design settings are very important to prevent defects in the final product such as porosity, cold shut, and shrinkage. This study aims to identify the effect of runner shape variations on the quality of Al-Si casting. The method used in this study is a laboratory experimental method. The study began with preparing the tools and materials, the materials used in this study were used pistons. The piston melting temperature was carried out at 750°C. The results showed that the results of the cast product using a truncated cone-shaped runner (variation 1) were the best results. Macrostructural analysis showed that specimens in variation 1 had minimum casting defects and lower shrinkage compared to variation 2. Microstructural analysis showed that the cast product produced several phases. Meanwhile, the hardness number for specimen variation 1 reached 98 HRE.
Revitalizing Orange Products: Implementation of Appropriate Technology for Higher Market Value Subiyantoro, Edi; Santi, Fitriana; Tsamroh, Dewi Izzatus; Wea, Efrida; Mutadafiq, Fiqih Syahdani
REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat Vol 5, No 1 (2024): REKA ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaelkomika.v5i1.51-58

Abstract

Oranges have a short shelf life, requiring immediate sale or processing to maintain their market value. Gading Kulon Village in Malang Regency has fertile land, making it a potential area for citrus picking tourism. The phenomenon of abundant harvests every season causes tour operators to incur losses due to plummeting prices. Unsold oranges are given away for free, leading to minimal profits for the tour operators. The objective of this community service is to increase the selling price of products by processing oranges into candies. Efficient processing requires appropriate technology, facilitating tour operators in meeting consumer demands. The community service method involves training and product trials. The results of the community service demonstrate the enthusiasm of the women processing oranges in turning them into candies.
Analisis Shaft Piston Rod Shock Absorber dengan Material Baja Karbon Menggunakan Finite Element Method Agus Dwi Putra; Bella Cornelia Tjiptady; Dewi Izzatus Tsamroh; Yayi Febdia Pradani; Dimas Hani Saputra
JURNAL FLYWHEEL Vol 15 No 2 (2024): Jurnal Flywheel
Publisher : Teknik Mesin S1 ITN Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/flywheel.v15i2.9453

Abstract

Shock merupakan komponen yang berperan dalam sistem kenyamanan berkendara. Fungsi dari shock itu sendiri adalah untuk meredam segala kejuatan di medan jalan. Tujuan penelitian ini adalah untuk mengsimulasikan shock kendaraan X yang mengalami patah. Material yang digunakan dalam pembuatan shock adalah baja karbon sedangkan metode yang digunakan dalam penelitian ini meliputi pembuatan desain model geometri shock absorber dan simulasi dengan finite element method. Finite element method dimaksudkan utnuk menganalisis von mises stress, strain dan safety factor. Hasil analisis menunjukkan bahwa von mises stress maksimum sebesar 100,7 N/m² dan strain maksimum sebesar 0,0000000003515 mm, serta safety factor yang dihasilkan mencapai 2.808e+006.
ANALISIS KEKERASAN DAN STRUKTUR MIKRO BAJA 304 DENGAN VARIASI HOLDING TIME Tsamroh, Dewi 'Izzatus; Pungky Eka Setyawan; Andrian Dwi Kristianto
RING ME Vol 3 No 1 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i1.20425

Abstract

Metallurgy is the science that studies the properties of metals and their alloys through the analysis of their structures. Metal structure and alloys are the determining factors of the steel microarrangement that affect metal properties. The purpose of this study was to determine the strength and hardness of steel 304. This study used an experimental method by treating the workpiece and then characterizing it to see the results. In the hardness test it was concluded that a temperature does not affect the level of hardness of a specimen. While the cooling medium greatly affects the level of hardness. The higher the viscosity of a cooling fluid, the higher the hardness formed. Microstructural testing concluded that temperature and cooling media both have an effect on the formation of pearlite and ferrite in a material. If the temperature is the same and the fluids have the same properties, then the pearlite and ferrite contents will be the same. Pearlite will easily form at high temperatures with a high viscosity of the coolant, while ferrite will easily form if the temperature is low with a high fluid viscosity.
ANALISIS HUBUNGAN PUTARAN KATUP DENGAN KONSTANTA PEGAS DENGAN MENGGUNAKAN PEREDAMAN Tsamroh, Dewi 'Izzatus; Jumiadi; David Ross
RING ME Vol 3 No 1 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i1.20429

Abstract

One of the problems of a machine is the vibration generated by the machine itself. Vibration is very influential on the structure and construction of the machine. One of the issues that is very important to note in these plans is the calculation of the deflection/deflection of the elements when subjected to a load. This is very important especially in terms of strength (strength) and stiffness (stiffness), where a horizontal bar that is loaded laterally will experience deflection. The deflection that occurs in elements that experience loading must be within an allowable limit. Based on the actual and theoretical research results for the Simple vibration apparatus, load and valve variations are directly proportional to the damping constant. The greater the load and valve rotation, the greater the damping constant. The beam deflection apparatus has several results, namely the load variation is directly proportional to the static deflection value. The greater the load, the greater the static deflection. Variation of distance (intermediate load point) is directly proportional to the static deflection value. The greater the distance, the greater the static deflection. Variation of distance (end load point) is directly proportional to the static deflection value. The greater the distance, the greater the static deflection. Thickness variation is inversely proportional to the static deflection value. The greater the thickness value, the smaller the static deflection. The width variation is inversely proportional to the static deflection value. The greater the width value, the smaller the static deflection.
ANALISIS HUBUNGAN ANTARA KONSTANTA PEGAS DAN DEFLEKSI STATIS DENGAN PEMBEBANAN BERBEDA TANPA PEREDAM Jumiadi; Dewi Izzatus Tsamroh; Ike Widyastuti; Arif Budiono
RING ME Vol 3 No 1 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i1.20430

Abstract

One of the most frequently encountered motions in nature is oscillatory motion (vibration). A particle oscillates when it moves periodically about an equilibrium position. A load attached to a spring that is stretched once is released, then it begins to oscillate. Basically, vibration is a technical system that contains mass and elasticity that is able to move relatively or can be said to be a movement that repeats itself at certain time intervals. Increasing technological developments show that the tools that have to do with vibrations are very diverse. One of them is the vibration that utilizes the Simple Vibration Apparatus. In the free vibration frequency experiment, from the test results without a damper with a mass of 0.47kN/m; 1.22kN/m and 3.3kN/m it can be seen that there is a big difference between the theoretical frequency value and the actual frequency value. The results of the theoretical deflection from experiments 1 - 5 have increased constantly. The greater the loading, the greater the deflection.
ANALISIS TEGANGAN DAN REGANGAN PADA KAWAT STAINLESS STEEL 304 HASIL PERLAKUAN HARDENING DAN TEMPERING Sekiwa; Suprapto, Agus; Tsamroh, Dewi Izzatus; Rusdijanto
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21747

Abstract

Currently, the demand for materials, especially metals, is very significant. Iron and steel are inseparable basic needs. However, with diverse needs, the desired mechanical characteristics of a material also vary. These mechanical aspects include hardness, ductility, strength, and toughness. The use of stainless steel is increasing worldwide due to its superior characteristics. One of them is using stainless steel wire. This research aims to identify the tensile strength limit of 304 stainless steel wire with variations in hardening and tempering. The test results show that the unheat treated 304 stainless steel wire has a higher stress value than the heat treated one. The test results show that the stress value in the test object which has undergone heat treatment of hardening at a temperature of 820°C with a holding time of 30 minutes with water cooling and tempering at a temperature of 400°C with a holding time of 20, 30, 40 minutes with air cooling has decreased. This can be compared with raw or untreated specimens which have a stress value of 176.815 kg/mm2. For specimens that underwent the hardening heat treatment process, the stress value decreased to a value of 88.025 kg/mm2. Meanwhile, for test objects that underwent a tempering process, the stress also decreased compared to normal or untreated test objects with stress values ​​for 20 minutes of tempering 87,261 kg/mm2, 30 minutes of tempering 87,261 kg/mm2, and 40 minutes of tempering 87,006 kg/mm2.
ANALISIS PENGARUH KOMPOSISI GARAM TERHADAP LAJU KOROSI PADA BAJA HSS Jago, Thomas Apriliano; Tsamroh, Dewi Izzatus; Jumiadi; Setyawan, Pungky Eka
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21748

Abstract

Corrosion, which is the process of metal damage due to environmental factors such as microbes, pH, humidity, temperature, and contaminants from the metal itself, has very destructive properties for metal. Before implementing appropriate control methods, testing is often necessary to determine the appropriate approach. One useful testing method is the spray chamber test, the working principle of which involves creating a mist of corrosive media on the test sample. In this research, HSS steel was used as a test sample. Using a spray chamber test, salt water of various compositions is poured into a container to produce mist, which is produced by a mist maker. The mist is then pushed upwards by a small fan with a current of 12 v and sprayed onto the test specimen over an 8 day period. This tool is useful for determining the corrosion rate of the metal being tested, allowing the determination of how quickly the metal is subject to corrosion, which is useful in selecting materials for construction that are appropriate to environmental conditions. Based on the test results, it can be concluded that the corrosion rate for HSS steel is 0.070 MPY with a salt composition of 500 grams, 0.072 MPY with a salt composition of 750 grams, 0.142 MPY with a salt composition of 1.250 grams, and 0.162 MPY with a salt composition of 1.750 grams.
INVESTIGASI PENGARUH VARIASI AIR LAUT TERHADAP LAJU KOROSI BAJA ST 37 Djahilepang, Raywantus Baur; Suprapto, Agus; Tsamroh, Dewi Izzatus
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21765

Abstract

In the current era of globalization, metal has an important role and is a primary need in various aspects of human daily life. One metal that is widely used is steel, which is a mixture of iron (Fe) and carbon (C) with the addition of other ingredients in the modern context. Low carbon steel, such as ST 37, is often used in making components such as nails, bolts and screw threads. The affordability and availability of ST 37 makes it a top choice in the construction industry, although it is often subject to corrosion problems due to its natural properties. In various situations and conditions, the wide use of ST 37 steel often interacts with natural elements, such as sea water, river water, oxygen, pH values, and other environmental conditions. The problem of corrosion is a major concern for many researchers and industry, because it can affect various processes such as cleaning by etching, pickling, and the use of corrosive chemicals such as acids and salts to inhibit corrosion. The test results showed that the highest corrosion rate occurred in Tanjung Perak Surabaya sea water, amounting to 2.817 mpy, while Panjang Pasuruan sand sea water had the lowest corrosion rate of 0.626 mpy.
Co-Authors Abdullah, Mohd Firdaus Abdurrabi Abdurrabi Abi Suwito Adrianto, Sis Nanda Kus Agus Suprapto Ahmad Muflih Ahmad Saepuddin Aji, Bagas Dwi Purnama Alief Muhammad Andrian Dwi Kristianto Andrianto, Sis Nanda Kus Andrijono, Djoko Andromeda, Tata Ani, Adi Izhar Che ANISA ZUHRIA SUGEHA Anitasari, Silvi Ardiansyah, Mochammad Fachrizal Arif Budiono Asrizal Azhar, Moh. Na'im Bagus Shandy Narmaditya Bella Cornelia Tjiptady Bella Cornelia Tjiptady Bimantara, Muhammad Yoka Brilliandy, Hikmal Akbar C., Muhammad Ilham Abednego Elsa Danang Yugo Pratomo Dandya, Habli Abid David Ross Dewi Puspitasari Diama Rizky Septiawan Didin Zakariya Lubis Dika, Johan Wayan Dimas Hani Saputra Djahilepang, Raywantus Baur Edi Subiyantoro Elsa C., Muhammad Ilham Abednego Ena Marlina Evi Rinata Fadillah, Rahmat Fahil Fahrozy, Muhammad Micho Faidillah, Hikmal Firdiansyah, Mokhamad Rizki Fitriani, Indah Martha Herawati, Andini Sofia Hikmal Akbar Brilliandy Ike Widyastuti Irwandi, Jul Viansyah Dwiki Jago, Thomas Apriliano Jibril Maulana Jumiadi Jumiadi, Jumiadi Kus Andrianto, Sis Nanda Mahfudi Sahli Subandi Mohammad Ainul Yaqin, Mohammad Ainul Muchammad Riza Fauzy Muhammad Arif Nur Huda Muhammad Ilham Abednego Elsa C. Muhammad Ilman Nur Sasongko Mutadafiq, Fiqih Syahdani Nika Devi Permata Wijaya Pancayudha, Den Arsyah Pilar Permatasari, Meirna Puspita Prakoso, Bagas Eka Prasanta, Ida Bagus Sradha Dana Prasetiyo, Ardianto Pratiwi, Y. R. Pungky Eka Setyawan Pungky Eka Setyawan Putra, Agus Dwi Putri, Widyarini Susilo Qur’aini, Dinda Faranita Rahmat Fahil Fadillah Ratna Fajarwati Meditama Riana Nurmalasari Riyanto, Obaja Eden Sentosa Rusdijanto Rusdijanto Rusdijanto, Rusdijanto Saifuddin Karim Santi, Fitriana Saputra, Catur Surya Saputra, Mohammad Iqbal Juan Seftiansyah, Albi Abimanyu Sekiwa Sentosa Riyanto, Obaja Eden Shiddiqy, Taqiyyudin Ahmad As Simangunsong, Rahel Sis Nanda Kus Andrianto Siskuhita, Dhoris Agritia Sudjatmiko Sudjatmiko, Sudjatmiko Sudjatmiko, Sudjatmiko Sunariati, Okta Rezki Syafana, Mohammad Arju Wandoyo, Ilham Akbar Wea, Efrida Widowati, Tamara Rahma Widyarini Susilo Putri Widyarini Susilo Putri Yahya Zakaria Yayi Febdia Pradani Yazirin, Cepi