MODEL MATEMATIS PROBABILITAS KERUSAKAN GRANULA AKIBAT PEMBEBANAN BERULANG

Salman Salman

Abstract


Perhitungan probabilitas kerusakan granula masih kompleks karena tidak memungkinkannya memasukkan semua paramater dalam satu model matematis. Selama ini posisi titik kontak pada penelitian probabilitas kerusakan untuk granula bulat pada saat uji pembebanan berulang diabaikan. Sejumlah peneliti menganggap seluruh permukaan granula adalah homogen. Kenyataannya struktur mikro dan sifat mekanik di tiap titik pada granula terdistribusi scara random. Distribusi struktur mikro ini mempengaruhi sifat probabilitas kerusakan akibat pembebanan berulang di bawah titik kritis. Karena itu probabilitas kerusakan pada butiran atau granula akibat pembebanan berulang dengan memperhitungkan posisi titik kontak selama pembebanan sangat penting dipelajari.  Hal ini berguna bagi para peneliti agar memperhitungkan distribusi sifat mekanik dan struktur mikro pada badan granula saat pengujian. Baik pengujian sifat mekanik, kimiawi dan fisik akibat perlakuan pengujian. Sebuah model matematis dipaparkan guna menentukan nilai probabilitas kerusakan pada granula akibat beban impak berulang dengan memperhitungkan posisi titik kontak. Selain itu juga memperoleh parameter baru dari model matematis tersebut yang berkaitan dengan posisi titik kontak selama pembebanan berulang pada granula. Persamaan matematis diuji secara numerik dan  divalidasi melalaui eksperimen.


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References


Aman, Sergej; Tomas, Jürgen; Kalman, Haim, (2011). ”Breakage Probability of Irregularly Shaped Particles by Impact Stressing.” Chemie Ingenieur Technik, Volume 83, issue 5 p. 704-709. ISSN: 0009-286X DOI: 10.1002/cite.201000152 WILEY-VCH Verlag.

Beekman, W.J., Meesters, G.M.H., Becker, T., Gaertner, A., Gebert, M., Scarlett, B. (2003). "Failure mechanism determination for industrial Granules using a repeated compression test. " Powder Technol. 130, 367–376.

Kalman, H., Rodnianski, V., Haim, M. (2009). "A new method to implement comminution functions into DEM simulation of a size reduction system due to particle–wall collisions. " Granular Matter 11 253–266.

Kalman, Haim (2004). "Empirical breakage ratio of particles due to impact.” Powder Technology 143– 144, 160– 169.

Pitchumani, R., Strien, S.A., Meesters, G.M.H., Schaafsma, S.H., Scarlett, B., (2004). "Breakage of sodium benzoate granules under repeated impact conditions." Powder Technology 140, 240–247.

Peukert, W.,Vogel, L. (2001). "Comminution of polymers—an example of product engineering.” Chemical Engineering & Technology 24, 945–950.

Rumpf, H. (1973). "Physical aspects of comminution and new formation of law of communition, Powder Technology, Vol. 7, 145-159.

Russell, A., Tomas, J., (2013) "Multiple Compression of Moist Spherical Elastic-Plastic Zeolite 4A Granules.” Chemical Engineering Technology, 36, No. 7, 1240–1248.

S.Salman, S. Aman, J.Tomas., (2012). “Breakage probability of granules by repeated stressing”, CIT Wiley, Volume 84 (9), 1594–1598

Schubert, W., Khanal, M., Tomas, J. (2005). "Impact crushing of particleParticle compounds – experiment and simulation.” Int. J. Mineral Processing, 75(1–2), 41–52.

Salman, A.D., Reynolds, G. K., Fu, J. S., Cheong, Y. S., Biggs, C. A., Adams, M.J. Gorham, D. A., Lukenics, J. and Hounslow, M. J. (2004). "Descriptive classification of the impact failure modes of spherical particles.” Powder Technology, vol. 25, 143-144.

Samimi, A., Boerefijn, R., Kohlus, R., Ghadiri, M., (2002).“Breakage of soft granules under uniaxial bulk compression and impact conditions.” World Congress on Particle Technology (WCPT 4), Sydney.

Simmchen, E., Riehle, M., (2000). "Grundlagen der Werkstofftechnik.“ Dt.Verl. fuer Grundstoffindustrie, Stuttgart.

S. Antonyuk,S., Tomas, J., Heinrich, S. and Mörl, L. (2005). "Breakage behaviour of spherical granulates by compression." Chem. Eng. Technol. , 28 (5), 623-629.

Tavares, L.M., Carvalho, R.M. (2007). "Impact work index prediction from continuum damage model of particle fracture. " Miner. Eng. 20 1368–1375.

Vogel, L., Peukert, W. (2005). "From single impact behaviour to modelling of impact mills.” Chemical Engineering Science 60, 5164–5176.

Weichert, R. (1991). "Theoretical Prediction of Energy Consumption and Particle Size Distribution in Grinding and Drilling of Brittle Materials.” Part. Part. Syst. Charact., 8, 55-62.

Weibull, W. (1939). "A statistical theory of the strength of materials.” Ingeniörsvetens-kakademiens Handlingar 151, Generalstabens Litografiska Anstalts Förlag, Stockholm.


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