http://repository.president.ac.id/xmlui/handle/123456789/3907 2026-04-06T10:53:25Z 2026-04-06T10:53:25Z Anggraini, Lydia dkk. http://repository.president.ac.id/xmlui/handle/123456789/11778 2024-02-23T04:31:51Z 2024-01-01T00:00:00Z

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 Anggraini, Lydia dkk. http://repository.president.ac.id/xmlui/handle/123456789/11777 2024-02-23T04:20:51Z 2023-01-01T00:00:00Z

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 Anggraini, Lydia Kalimi http://repository.president.ac.id/xmlui/handle/123456789/11733 2024-01-24T03:50:34Z 2021-01-01T00:00:00Z

Welding Shape Control of Cross Member Backbone Assembly by Automatic Gas Metal Arc Yaskawa-MA1440 Type Anggraini, Lydia; Kalimi In order to prevent distortion caused by heat which affects the material deformation, the properties controlled are required. The properties changes and the placement of the mounting position will effect the weld strength that causes cracks and broken joints, therefore it affects the safety of machine construction. Thus, the objective of this paper is to control the shape of cross member backbone assembly by gas metal arc welding (GMAW). The welding is produced by an automatic robot Yaskawa-MA1440 type. In order to obtain the good quality of the result, the welding shape is controlled by a parameters combination of voltage, current, and speed. Yaskawa-MA1440 type is used as the automatic welding machine. The main material used is cold rolled steel coil sheet MJSC270D-OD with a thickness of 1.2 mm. In addition, to control the welding shape, the specified shape design standard is followed include travel speed, gas flow, welding direction, torch tip distance to the workpiece, torch angle and welding angle. The results of visual and dimensional were also examined in this research. Furthermore, the macrostructure i.e. leg length, fusion penetration, throat thickness have been analyzed and confirmed based on the standards used in the auto body vehicle part company. The appropriate parameters for the finest welding shape are defined at the horizontal position using an electric current of 120 A and the welding voltage of 18 V (± 1 V). Thus, the measurement control of macrostructure is defined as reference parameters for mass production of cross member backbone assembly. Key Engineering Materials 2021, Vol. 877, pp 90-95.

2021-01-01T00:00:00Z Anggraini, Lydia Adelya Anjany http://repository.president.ac.id/xmlui/handle/123456789/11732 2024-01-24T03:42:53Z 2021-01-01T00:00:00Z

Sustainable Fabrication Technology of Composite Board by Kenaf-Polypropylene for Automobile Door Interior Applications Anggraini, Lydia; Adelya Anjany Polypropylene resins have been enfolded with the automotive industry and suppliers to produce several spare parts. This is aimed at achieving zero emissions, kenaf plant which in Latin is Hibiscus Cannabinus is a natural fiber replacement resin. Natural fiber composites come in many different types, but kenaf has been exploited extensively over the last few years. The pre-board flow process of kenaf-polypropylene starts from mixing kenaf about 40% with 60% polypropylene, forming a pre-mat as the first output, entering the main treatment with the hot press into pre-board as the final output. Kenaf-polypropylene door trim is very absorbent of CO2, which is related to natural fiber base material. Door trim with kenaf-polypropylene as the base material reduces the weight by about 30% of the previous polypropylene resin and still provides high rigidity even at a reduced weight. The entire process is requiring 48382.4 kWh / month per cycle of total power consumption. Key Engineering Materials, Vol. 897, pp 51-56.

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