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All Journal Jurnal Teknik Mesin Indonesia Journal of Applied Sciences and Advanced Technology
Andres Budiono
Universitas Kebangsaan Republik Indonesia (UKRI)
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Simulasi atom mekanika retakan material alumunium dengan pembebanan singkat Andres Budiono; Erdiansyah Erdiansyah
Jurnal Teknik Mesin Indonesia Vol 16 No 2 (2021): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v16i2.236

Abstract

Penelitian ini bertujuan untuk mem-validasi hasil eksperimen pada uji ketangguhan retak material paduan aluminium di bawah pembebanan dinamik dengan simulasi atom. Model retakan yang digunakan adalah material Alumunium dengan orientasi atom [111], [110], dan [112] dengan jumlah atom 17.402 dan kondisi batas periodik untuk mempresentasikan kondisi regangan bidang. Hasil yang diperoleh menunjukkan beberapa dislokasi yang dipancarkan dari ujung retak, nukleasi dan pertumbuhan lubang kecil (micro void) terjadi di depan ujung retak. Lubang kecil dimulai dari inti dislokasi saat beban dijaga konstan yang tidak pernah bersatu dengan retak utama karena jarak antara lubang kecil dan celah utama terlalu jauh secara atom dan pertumbuhan lubang menjadi stabil. Validasi secara kualitatif dapat diberikan oleh simulasi atom ini.
Molecular Dynamics Approach on Dislocation Emission from Crack Tip Under Stepwise Loading in Aluminum Andres Budiono; Hiroomi Homma
Journal of Applied Sciences and Advanced Technology Vol 3, No 3 (2021): Journal of Applied Sciences and Advanced Technology
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jasat.3.3.97-108

Abstract

Molecular dynamics (MD) simulation is carried out for pure aluminum under stepwise loading condition. This simulation aims to understand the experimental results on impact fracture toughness of aluminum alloys under short pulse loading.  The model used in this simulation is featured by  an atomistic model with single atom and the [111], [110], and [112] directions, a center-cracked plate model by the atomistic model with 17,402 number of atoms, and the periodic boundary condition in z-axis to postulate the plane strain condition. The obtained results are some dislocations emitted from crack tip, a void nucleation and growth taking place ahead of the crack tip. This micro void was initiated from a dislocation core when the load was kept being constant. This micro void never coalesced with the main crack as the distance between the micro void and the main crack was too far atomically and the micro void growth was stabilized. Energy balance investigation shows kinetic energy of the system was very small and almost constant during the process.   The potential energy increased as the external load increased and then became constant when the load became constant. Significant fluctuation of energy was observed during dislocation emission. Some amount of barrier energy must be released for the dislocation emission. The qualitative understanding can be provided by this molecular dynamic simulation.
Co-Authors Erdiansyah Erdiansyah Hiroomi Homma