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Comparison of fracture toughness testing by the single edge v-notch beam and the surface crack in flexure method on silicon nitride

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IOP Conference Series: Materials Science and engineering 2020年第1期852卷

作者： Tjokorda Gde Tirta Nindhia Study Program of Mechanical Engineering Faculty of Engineering Udayana University Jimbaran Bali Indonesia

This work is intended to compare the SEVNB and the SCF methods for fracture toughness testing. Both of the test methods are applied to a silicon nitride. Both methods are standardized and both have some minor shortcomings with respect to practicability and match of the theoretical description of the test situation with the actual test situation. SEVNB is easy to perform, but uses a notch of known depth (+ small micro-cracks of unknown size in front of a notch) instead of a crack, SCF uses a presumably residual stress-free indentation crack which is sometimes difficult to measure, not always semi-elliptical, as assumed to apply the evaluation formula, and may be accompanied by lateral cracks. Both methods will be analysed with respect to possible experimental errors. Variations of the SCF method are applied in order to examine how pre-cracks can be introduced which can be detected on the fracture surface. The geometry of the SCF-pre-crack is varied by applying different loads and by removing different amounts of material. The geometry of the Knoop pre-cracks system is investigated. The results help to identify conditions under which the SCF method can be used successfully to measure the fracture toughness of silicon nitride ceramics.

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Prototype Excavator with Pneumatic System Controlled Using Android Device 1

Prototype Excavator with Pneumatic System Controlled Using A...

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1st International Conference on Applied Science and Technology, iCAST 2018

作者： Randis Department of Mechanical Engineering Study Program of Heavy Equipment Balikpapan State Polytechnic Balikpapan Indonesia

ISBN: (纸本)9781538675489

This research is aimed to design and create a prototype excavator pneumatic system with android smart phone control system. The prototype excavator system made in this research utilizes Arduino Uno ATmega 328 as its microcontroller, while the Bluetooth module device is used as a connecting medium between the android device with the arduino to move the cylinder. The mechanical device represent the two main parts of the device: based and the arm section, six cylinders used to move each boom, arm, and bucket section, while the swing motion is done by using a DC motor. App Inventor is used to create an application on android, while arduino program is used to embed the program into the microcontroller. The working principle of the whole system is by using an android device connected with Bluetooth module to give signal to the microcontroller, then microcontroller will activate the relay and relay activate solenoid and end the process by moving the cylinder. Calculation of cylinder force obtained is 54,95 N when cylinder move forward and 46,158 when cylinder move backward. © 2018 IEEE.

关键词： Excavators

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Performance analysis of forced convection coolers using synthetic jets with variations in altitude from synthetic jets to heat sources

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Journal of Physics: Conference Series 2020年第3期1569卷

作者： Muchammad Baihaqi Muslich Damora Rhakasywi M As'adi Nur Cholis Mechanical Engineering Study Program Faculty of Engineering Universitas Pembangunan Nasional 'Veteran' Jakarta

Every electronic device has a disadvantage that is heat generated from the components contained in the device while operating. The heat that occurs during the process can affect the effectiveness of these electronic devices. The cooling fan is directed to a heat source from an electronic device with the aim of maintaining the device's performance temperature. However, the cooling fan used still has some disadvantages in terms of dimensions. Therefore, research on synthetic jets is carried out as an innovation in cooling. This study aims to find wave characteristics as a source. Optimum frequency selection to support cooling. As well as the ideal height of synthetic jets to heat sources. The method used in the research is direct and computer-based data retrieval for CFD. The use of triangular waves as a source of cooling with a frequency of 80 Hz at an altitude of 8 cm can reduce rapidly. However, the lowest final temperature comes from a height of 2 cm which is 28.1 °C.

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Analysis performance of forced convection cooling using synthetic jets with wave variations (sine, square, and triangular)

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Journal of Physics: Conference Series 2020年第3期1569卷

作者： Bintang Arya Putra Damora Rhakasywi M As'adi Nur Cholis Mechanical Engineering Study Program Faculty of Engineering Universitas Pembangunan Nasional 'Veteran' Jakarta

Cooling effectiveness using a cooling fan on an electronic device becomes a benchmark. Speaker- based synthetic jets that are becoming innovations today work on the principle of zero input mass, producing air in the cavity with an oscillating membrane which results in the suction phase occurring in the orifice hole. The generated air then flows through the orifice to pound the heat source as a forced convection cooler. Speakers used as oscillating actuators resemble waveforms using sine, square, and triangular wave functions with frequencies of 80, 100, and 120 Hz. Air flow simulation created using Fluent CFD. The use of wave variations has different characteristics. Triangular waves indicate the final test temperature reaches 27oC, with an optimum frequency of 80 Hz. Air flow created in the form of vortex flow with a type of turbulent flow. The electric power consumption of cooling fans reaches ten times the consumption of synthetic jet power.

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Development of teaching materials for gas metal arc welding (gmaw) practice courses

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Journal of Physics: Conference Series 2020年第1期1700卷

作者： Sudiyono Ari Dwi Nur Indriawan Musyono Sunyoto Ahmad Mustamil Khoiron Mechanical Engineering Education Study Program Universitas Negeri Semarang Automotive Engineering Vocational Education Study Program Universitas Negeri Semarang Semarang Indonesia

In improving the quality of human resources, one of which lies in the quality of quality education. In this case, education has a very important meaning in human life, both in the life of individuals, nations, and countries. Therefore education must be implemented as well as possible so that it is following the objectives that have been planned. The objectives to be achieved from this study are to produce teaching materials for GMAW welding practice materials, produce teaching materials that are suitable for use in GMAW welding practices, and provide an evaluation of the effectiveness of using GMAW welding practice teaching materials after being used in learning. This research method uses the Borg and Gall development research method which is simplified into four steps, namely modified (simplified) into 4 steps consisting of: (1) preliminary study; (2) product development and validation; (3) limited trial; and (4) the final product. The type of research used in this research is the development of teaching materials in the form of practice modules, job sheets, and evaluation sheets in the GMAW welding practice course. Based on the research results, the researcher can conclude that the development of teaching materials for GMAW welding practices has been implemented properly. The revised results from the experts have been applied to the modules made so that the modules can be used properly by students.

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Measurement analysis of the level of household preparedness for facing landslide in Bogor regency

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IOP Conference Series: Earth and Environmental Science 2021年第1期708卷

作者： P D Saputra C Rahmawati K S H Purnomo E Larosa Nurhasanah Military Building Construction Engineering Study Program Faculty of Military Engineering Indonesia Defense University Bogor Indonesia Industrial Engineering Department Faculty of Industrial Technology Universitas Dirgantara Marsekal Suryadarma Jakarta Indonesia Master of Management Program Universitas Teknologi YogyakartaYogyakarta Indonesia Mechanical Engineering Education Faculty of Teacher Training and Education Universitas Negeri Yogyakarta Yogyakarta Indonesia Civil Engineering Study Program School of Engineering & Technology Tanri Abeng University Jakarta Indonesia

There are so many areas in Indonesia that are prone to landslides. Bogor is the regency with the most frequent landslides. Therefore, high community preparedness is needed to deal with the landslide, especially at the household level because it is the spearhead of preparedness and influence disaster risk. The objective of this research is to measure and analyze the level of household preparedness for facing landslide. The location of this research is in Cibadak Village, Bogor regency where a landslide disaster had happened. This is a quantitative research. The number of the samples were 100 household. Data collection was done by surveying samples and distributing questionnaires. The data would be analyzed with descriptive analysis, and the results of level of household preparedness would be categorized to five levels which were very prepared (80-100), prepared (65-79), almost prepared (55-64), less prepared (40-54), and not prepared (0-39). The results of the research are the average index value of Knowledge and Attitude (KA) parameter is 66.77, Emergency Planning (EP) parameter is 52.24, Warning System (WS) parameter is 64.80, Resources Mobilization Capacity (RMC) parameter is 51.25 and the level of household preparedness for facing landslide is 59.26 or and it is significant at the almost prepared level.

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Application of VLAB-Based STEM in The Direct Circuit Electricity Section

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Journal of Physics: Conference Series 2020年第5期1477卷

作者： A Rachmat ED Jannati D Susandi I Kaniawati P Siahaan Mechanical Engineering Study Program Universitas Majalengka Industry Engineering Study Program Universitas Majalengka Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia

Our research aims to determine the results of student responses after applying VLAB-based STEM learning in the direct current electric circuit section. This study uses a qualitative method. Sampling using a purposive sampling technique. The sample consisted of 13 students of mechanical engineering study program at Universitas Majalengka. The sample consisted of 13 students of mechanical engineering study program at Universitas Majalengka.. Data collection techniques using student questionnaire responses. The results of the questionnaire were analyzed descriptively. Most students respond like VLAB-based STEM, the stages of learning provide learning experiences for students so students are motivated in learning.

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The effect of sea water corrosion on tensile strength of combination welded joint of stainless steel 304-201

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： Tjokorda Gde Tirta Nindhia I Wayan Surata I Wayan Bandem Adnyana I Gusti Komang Dwijana Study Program of Mechanical engineering Engineering faculty Udayana University JimbaranBali Indonesia 80361

Construction installations built with stainless steel are the main choice of the list of materials that can be used for construction near the sea. With the recent discovery of tungsten inert gas (TIG) technology, construction with stainless steel can be realized. In some cases stainless steel welding joints are made by connecting with stainless steel of different types without regard to the strength generated especially if experiencing corrosion in this case corrosion due to sea water. In this study the tensile strength of stainless steel combination joints of type 304-201 was tested and compared with similar joints of types 304-304 and 201-201. The effect of seawater corrosion on the tensile strength of stainless steel joints was also examined. This research found that the highest tensile strength is 304-304 joints followed by 304-201 combination connections and the lowest is 201-201 joints. The effect of seawater corrosion is known to reduce the tensile strength of all types of joints.

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Characteristics of gradual discharging process on a thermosyphon SWH tank containing PCM 4

Characteristics of gradual discharging process on a thermosy...

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4th International Conference on Science and Technology, ICST 2018

作者： Nadjib, Muhammad Suhanan Waluyo, Joko Department of Mechanical and Industrial Engineering Faculty of Engineering Gadjah Mada University Yogyakarta Indonesia Mechanical Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Yogyakarta Yogyakarta Indonesia

ISBN: (纸本)9781538658130

This paper aims to reveal the characteristics of thermal energy release in a solar water heater (SWH) tank involving phase change materials (PCM) as thermal energy storage material. A bundle of cylindrical capsules was inserted in 31.37 liters of SWH tank. The capsule contains paraffin wax as latent type heat storage. K type thermocouples were mounted on the water side and the PCM side. Experiments was begun with the charging process using solar energy until water temperature exceeds the melting temperature of PCM. After that, a gradual discharging process is done to release the thermal energy from the tank. The SWH tank containing 17.3 liters of water can produce 60 liters of hot water with an average water temperature of 45.13 °. This condition is achieved when the average daily radiation intensity is 699.92 W/m2. The PCM has contributed in storing thermal energy during the discharging process. © 2018 IEEE.

关键词： Phase change materials

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The effect of artificial age time on crystal size, dislocation density, hardness and micro structure on Al 6061 materials alloy

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AIP Conference Proceedings 2021年第1期2342卷

作者： Budiarto Susilo Ulung Sanjaya 1Mechanical Engineering Study Program Faculty of Engineering Universitas Kristen Indonesia Jakarta Indonesia 2Electrical Engineering Study Program Faculty of Engineering Universitas Kristen Indonesia Jakarta Jl. Mayjen Sutoyo no.2 Cawang Kramat Jati Jakarta 13630 Indonesia 3Fields of Balmetsenpi Puslabfor Police Headquarters Jakarta Indonesia

Research on the effect of T6 heat treatment and artificial life time on crystal size, density dislocation, hardness, and microstructure of Al 6061 alloy material made from powder metallurgy. The T6 heat treatment starts with a solid solution which is heated at 530 ° C, held for 60 minutes, then quenching into the water media, and the artificial aging process at 200 ° C and variations in the holding time of 1h, 24h, and 30h. Crystal size, dislocation density and lattice microstructure testing using X-ray diffractometer, hardness testing with Vickers scale and surface microstructure with SEM-EDX. Test results of crystal size, dislocation density, and micro lattice strain on 4 phase α-Al at the miller index plane (111), (200), (220), and (311) show that the crystal size increases with the duration of heating time of artificial aging. While dislocation density and micro lattice strain increase over a heating period of 1h to 30h, dislocation density and lattice strain decrease at the Miller index plane (111) to (311). The hardness testing of Al 6061 as-cast material was 54 HV after quenching the water hardness value of 75 HV, but after artificial aging the hardness decreased with a longer holding time from 45.50 HV to 39.95 HV. Microstructure observations with SEM-EDX, showed that the Al 6061 test sample without heat treatment showed a dominant α-Al matrix, whereas in the Al 6061 sample after the T6 process it was seen that the Mg2Si phase functioned to harden the Al 6061 alloy.

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