http://repository.president.ac.id/xmlui/handle/123456789/3193 2026-04-07T08:21:03Z http://repository.president.ac.id/xmlui/handle/123456789/11778 Low cycle fatigue behavior and deformation mechanism of core–shell heterogeneous grain structured CoCrFeMnNi high-entropy alloy Anggraini, Lydia dkk. Heterogeneous grain structured high-entropy alloys (HEAs) exhibit excellent strength-ductility synergy due to the peculiar grain structure topology. However, the understanding of cyclic response and deformation mechanism under low cycle fatigue (LCF) loading is still inadequate. Therefore, the LCF behavior and deformation mechanism of CoCrFeMnNi HEAs with a three-dimensional core–shell grain structure were investigated in this paper. The effects of core–shell network structure on cyclic response and fatigue life are revealed. The dislocations activity dominantly appears in the soft core regions prior to the hard shell region. The LCF resistance remains when the strain amplitude is below 0.5%. International Journal of Fatigue 182 (2024) 108185. p. 1-14. 2024-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/11777 Utilization of biosilica for energy-saving tire compounds: Enhancing performance and efficiency Anggraini, Lydia dkk. Energy-saving tires have been developed by researchers in the industry in order to minimize hysteresis loss. In general, this is achieved by combining precipitated silica sourced from silica sand with a silane coupling agent. This strategic reaction serves to elevate the performance characteristics of tread tire, effectively enhancing their properties. Therefore, this research is aimed to investigate the utilization of commercially available biosilica compared to high dispersed (HD) silica, examining their potential as reinforcing agents in the composition of passenger tread tire compound. This compound was formulated using a blend of solution styrene-butadiene rubber (SSBR) and butadiene rubber (BR). A comprehensive analysis was conducted to assess the impact of varying ratios between biosilica and HD silica on themechanical and dynamic properties of tread tire compound composed of SSBR and BR blend. The results showed that the incorporation of biosilica could effectively reduce the filler network resulting in better dispersion of biosilica in the SSBR/BR blend matrix. As a result, it improved wet grip (44%) and rolling resistance (26%) while maintaining abrasion resistance compared with HD silica in passenger tread tire compound. The application of biosilica as an ecofriendly reinforcement material exhibited its potential for elevating the performance of energy-efficient tread tire. e-Polymers 2023; 23: 20230043. p. 1-13. 2023-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/11742 PEMODELAN DAN ANALISA STRUKTUR MEKANIKA PADA KONTROL SISTEM ADAPTIF END EFFECTOR DENGAN DYNAMIXEL AX-18A MOTOR SERVO Anggraini, Lydia; Ardhi Bebi Laksono Tujuan utama dari proyek ini adalah untuk memberikan kontribusi secara deskriptif terhadap pemahaman perancangan adaptif end-effector yang dikombinasikan dengan motor servo. Simulasi dan perancangan alat ini terletak pada ujung lengan robot, yang mana merupakan salah satu topik yang paling banyak diteliti dalam dunia robotik dan industri otomasi. End-effector merupakan sistem perancangan pada sebuah proses otomasi yang harus memperhitungkan banyak kemungkinan dari respon statika dan mekanika dalam pengembangan menghadapi persaingan yang sangat ketat di dunia industri. Untuk menentukan perangkat tambahan pada suatu robot, end-effector akan didesain dengan mempertimbangkan dari berbagai kemungkinan yang terjadi pada berbagai variasi terhadap respon benda kerja, sehingga dapat mensimulasikan berbagai tingkat gesekan dan tekanan maupun pengaruh dari kontak end-effector dengan berbagai bentuk benda. Thesis ini memperkenalkan proses desain terpadu untuk desain Gripper dua jari dengan menggunakan simulasi. Untuk memfasilitasi desain terpadu dari Gripper, penulis memakai perangkat lunak Matlab R2015a / Simulink (SimMechanics) dan Inventor sebagai 3D Cad Model. Motor Servo yang akan digunakan disini adalah jenis motor servo Dynamixel AX-18A yang mempunyai kecepatan 97RPM dan Torsi sebesar 1,8 N.m dengan tegangan 12Volt. Untuk menghadapi revolusi industri 4.0 maka desain dan rancangan seperti alat ini akan membantu dalam proses improvisasi seiring teknologi yang semakin berkembang pesat dengan harapan dapat meminimalisir pengeluaran biaya yang berlebihan ketika melakukan improvement. Dari thesis ini bisa dilihat respon power, torque, speed, power in, power out, effeiciency dan current. Ketika suatu kasus memerlukan spesifikasi tertentu maka dengan perhitungan ini bisa dengan mudah menyelesaikan permasalahan hanya dengan mengganti motorservo yang sesuai dengan spesifikasi yang dikehendaki. Journal of Mechanical Engineering and Mechatronics 2018, Vol. 3 No. 1. 2018-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/11741 Tensile Behavior of SM520B-1G Plate by SMAW Joint Applied for Elevated Highway Road Construction Anggraini, Lydia; Revi Rinaldi; Jalu Wening Wangsanagara The main objective of this project is to study the mechanical and chemical characteristics of the SM520B welding plate used in the Jakarta-Cikampek Elevated Highway construction. The construction is needed to decrease the high volume of vehicles passing the highway every day. SM520B metal plate is used as the material in the girder box due to high strength and toughness and also good weldability. There are several tests conducted in the lab of PT Biro Klasifikasi Indonesia (Persero), i.e., spark OES test, tensile test, bending test, Charpy impact test, macro hardness test, and macro etch test. Spark OES test result shows that SM520B is low alloy steel with 0.165% carbon content. The SM520B tensile test result determines that the average yield strength, i.e., 503.45 N/mm², and the average tensile strength, i.e., 608.87 N/mm² of SM520B steel plate has met the requirement according to ASTM DS67B standard. The bending test result shows that no crack was found in the welding area. The Charpy impact test results of SM520B Welding plate indicates that high impact energy occurs in the welding area with the highest value of 214,24 J and slowly reduces when approaching close to the fusion line, i.e., 186.08 J. Higher Hardness Vickers value occurs in the HAZ area of SM520B during Vickers hardness, i.e., 235.8 J and the macro etch test result on the welding plate indicate there is no significant crack, porosity, and slag inclusion found in the welding. Journal of Mechanical Engineering and Mechatronics, Vol. 8 No. 2, pp. 63 - 71 2023-01-01T00:00:00Z