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All Journal Mekanika: Majalah Ilmiah Mekanika Pilar Teknologi : Jurnal Penelitian Ilmu-ilmu Teknik
Sudarno Sudarno
Universitas Merdeka Madiun

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Pengaruh Kolektor Pelat Gelombang Dengan Dua Kaca Penutup Terhadap Penambahan Panas Untuk Meningkatkan Kinerja Solar Water Heater Dian kusuma; Mustafa Mustafa; Sudarno Sudarno
JURNAL PILAR TEKNOLOGI Jurnal Ilmiah Ilmu Ilmu Teknik Vol. 4 No. 1 (2019): Jurnal Pilar Teknologi
Publisher : LPPM Universitas Merdeka Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33319/piltek.v4i1.25

Abstract

The worked principle of solar collector wave absorber plate was to transfer solar radiation to the worked fluid. The solar radiation that falls on the first glass was partially reflected, then on the second glass partially absorbed by the absorbent plate. The heat absorbed by the absorbent plate will be used to heat the worked fluid (water) between the absorbent plate and the storage plate. The purpose of this research was to design and make solar collector used wave plate with two cover glass. The addition of incomed water heat used temperatures of 30 ° C, 40 ° C, 50 ° C. The method used was used an expriment by analyzed the effect of initial heat addition on efficiency. From the results of test data obtained collector performance of solar water heater the greater the addition of heat used then the smaller the efficiency. Each of the average heat additions efficiency at 30 ° C was 19.66%, the temperature of 40 ° C was 17.75%, and the temperature of 50 ° C was 12.23%.
Faktor Yang Mempengaruhi Flame Cutting CNC Dan Waktu Pendinginan Terhadap Kekerasan Mustafa Mustafa; Sudarno Sudarno
JURNAL PILAR TEKNOLOGI Jurnal Ilmiah Ilmu Ilmu Teknik Vol. 6 No. 1 (2021): JURNAL PILAR TEKNOLOGI
Publisher : LPPM Universitas Merdeka Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33319/piltek.v6i1.68

Abstract

Abstract— In material that is subjected to heat treatment or workmanship such as in the welding process or flame cutting cutting, it will experience structural changes and mechanical properties. Changes in mechanical properties will cause losses such as: material becomes hard and brittle, although tensile strength and wear resistance increases. In this study an analysis of the factors affecting flame cutting cnc and cooling time against hardness was carried out. This study aims to determine the factors that influence the change in hardness on the results of flame cutting cutting. The study was conducted with three different treatments. The results of flame cutting cutting are cooled with 10 seconds, 25 seconds and 50 seconds respectively. Hardness data collection was carried out at a distance of 2 mm, 10 mm, 20 mm, 30 mm, 40 mm and 50 mm. The experimental results showed that the hardness value of SS 400 material at 10 seconds cooling time resulted in an average hardness of testing 1 = 76 HRB, testing 2 = 76 HRB, testing 3 = 76 HRB. At 25 seconds cooling time produces the average hardness from testing 1 = 74.83 HRB, testing 2 = 74.66 HRB, testing 3 = 74.33 HRB. And the 50-second cooling time produces the average hardness of the test 1 = 73.66 HRB, testing 2 = 73.33 HRB, testing 3 = 7658 HRB. Keywords—: flame cutting; SS 400; hardness.
Failure Criteria in Crashworthiness Analysis of Ship Collision and Grounding Using FEA: Milestone and Development Hermes Carvalho; Ridwan Ridwan; Sudarno Sudarno; Aditya Rio Prabowo; Dong Myung Bae; Nurul Huda
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i1.70959

Abstract

This study presents reviews of the failure criteria to capture the resulting response due to the catastrophe of ship collision and grounding using the finite element. Researchers have introduced several failure criteria, for instance, the DNV RP-C204 criterion, Germanischer Lloyd criterion, Peschmann, RiceTracey and Cockcroft-Latham (RTCL), Bressan-Williams-Hill (BWH) instability criterion, and Liu criterion. As in the mathematical formula, each criterion has a difference. The choice of failure criteria will depend on the simulation's specific requirements and the analysis's goals. Liu's criterion can be used to evaluate the failure of materials in ship collision simulations, for example, when large element sizes (i.e., 20 mm) are considered in the simulation.
Evaluating the Influence of Environmental Factors and Parameters on Advancements in Welding and Joining Processes: A Review Sudarno Sudarno; Quang Thang Do; Haris Nubli; Dandun Mahesa Prabowoputra; Nur Candra Dana Agusti; Ridwan Ridwan; Anggi Vandika
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i2.75378

Abstract

This review article presents a comprehensive overview of welding, including its environmental influence, common welding failures, welding parameters, and predictions of development regarding welding and corrosion. The quality and integrity of welds can be significantly affected by environmental factors such as temperature, humidity, and atmospheric contaminants. Moreover, welding failures can occur due to various reasons, such as improper welding techniques, inadequate preparation, corrosion, or material defects, leading to structural weaknesses and compromised joint integrity. Furthermore, notable progress has been achieved in welding system technology, encompassing automation, robotics, and real-time monitoring. These advancements underscore the vital role of welding parameters in transforming control, precision, and productivity within the welding process. The integration of innovative welding systems has led to improved welding efficiency, reduced human error, and increased overall process reliability. This review consolidates knowledge from diverse sources, making it a valuable resource for researchers, practitioners, and industries involved in welding.
Numerical Analysis of Openings in Stiffeners under Impact Loading: Investigating Structural Response and Failure Behavior Ridwan Ridwan; Sudarno Sudarno; Haris Nubli; Achmad Chasan; Iwan Istanto; Pandu Sandi Pratama
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 2 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i2.76774

Abstract

As the demand for lightweight ships continues to rise, there is a growing necessity to explore innovative methods that can reduce the weight of ship structures without altering the materials used. This research addresses this challenge by investigating the effect of opening in stiffener under impact loading. The research aims to provide valuable insights into optimizing weight reduction strategies while ensuring the ship's overall strength and performance remain uncompromised. To achieve this goal, the study employed the finite element method as a solver. By simulating impact scenarios and analyzing stiffener responses, the numerical analysis quantified the structural behavior and failure modes. The focus was on understanding the impact of openings on the structural integrity and how it relates to their positioning relative to the impact point. The results of the study indicate that opening slightly distant from the impact point exhibit greater strength, showcasing a counterintuitive relationship between opening placement and structural response.
Co-Authors Achmad Chasan Aditya Rio Prabowo Anggi Vandika Dandun Mahesa Prabowoputra Dian Kusuma Dong Myung Bae Haris Nubli Hermes Carvalho Iwan Istanto Mustafa Mustafa Nur Candra Dana Agusti Nurul Huda Pandu Sandi Pratama Quang Thang Do R. Ridwan