Material Selection of Smartphone Body Shell [Autosaved].ppt 2
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This document compares various materials for use as smartphone shells based on their fracture toughness, thermal conductivity, stiffness, embodied energy, and other properties. It presents data on aluminum, polycarbonate, carbon fiber reinforced polymer (CFRP), epoxies, and polymethyl methacrylate (PMMA) in tables and charts. The objective is to optimize fracture toughness while minimizing mass. Polycarbonate has the best material index values for thermal conductivity and embodied energy, while aluminum ranks highest for stiffness and CFRP for fracture toughness. The conclusion is that polycarbonate may be the best material for smartphone shells based on the design criteria and objectives.
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Material Selection of Smartphone Body Shell [Autosaved].ppt 2
- 3. Aluminum Density : 2.5 ~ 2.7 g/cm^3
- 4. Polycarbonate Molecular Structure of PC -thermoplastic polymers -they are polymers containing carbonate groups (–O–(C=O)–O–).
- 5. Evolution Years iPhone Samsung Galaxy 2007 iPhone 1G - 2008 iPhone 3G - 2009 iPhone 3GS Galaxy 2010 iPhone 4 Galaxy S 2011 iPhone 4S Galaxy S2 2012 iPhone 5 Galaxy S3 2013 iPhone 5S and 5C Galaxy S4 2014 - Galaxy S5
- 6. Design Criteria: •To protect the core system of a smartphone. •The compression and tension which happen in bending can affect the functionality of the phone and might as well causes the phone to break easily •To avoid any plastic deformation •Assumption: the shell must be an elastic beam
- 7. Objective Objective :Optimizing fracture toughness and minimizing the mass
- 9. Ashby Materials Chart: Fracture Toughness vs Elastic Limit Chart 1
- 10. Table of Materials and their Material Indices Material Fracture Toughness/MPa*m^1/2 YieldStrength/MPa Material Index Aluminum 35 500 0.07 CFRP 88 1050 0.083809524 Magnesium 18 400 0.045 Polycarbonate 4.6 70 0.065714286 Epoxies 2.22 71.7 0.030962343 PMMA 1.6 72.4 0.022099448 Table 1
- 12. Table of Materials and their Material Indices Table 2 Material Thermal Conductivity(W/m*K)Thermal Conductivity^2 Density(g/cm^3) Material Index Aluminum 76 5776 2.7 6.41223E-05 Magnesium 1.28 1.6384 1.74 0.35077676 CFRP 50 2500 1.5 0.000266667 Ploycarbonate 0.19 0.0361 1.114 24.86609607 Epoxies 0.18 0.0324 1.11 27.80558336 PMMA 0.08 0.0064 1.16 134.6982759
- 13. Stiffness
- 14. Ashby Materials Chart: Young Modulus vs Density Chart 2
- 15. Table of Materials and their Material Indices Table 3 Material Modulus(MPa)Modulus^(1/2) Density(g/cm^3) MaterialIndex Aluminum 82 9.055385138 2.7 3.353846347 Magnesium 47 6.8556546 1.74 3.94003138 CFRP 150 12.24744871 1.5 8.164965809 Ploycarbonate 2.44 1.562049935 1.114 1.402199224 Epoxies 2.35 1.532970972 1.11 1.381054929
- 16. Materials and Environment Carbon Footprint: The greenhouse gas emission from the material production
- 17. Ashby Materials Chart: Young Modulus vs Production energy per cubic metre Chart 3
- 18. Table of materials and their material indices Table 4 Material Modulus(MPa)Modulus^(1/2) EmbodiedEnergy(MJ/kg) Density(g/cm^3) MaterialIndex Aluminum 82 9.055385138 200 2.7 0.016769232 Magnesium 47 6.8556546 360 1.74 0.010944532 CFRP 150 12.24744871 259 1.5 0.031524965 Ploycarbonate 2.44 1.562049935 105 1.114 0.013354278 Epoxies 2.35 1.532970972 105 1.11 0.013152904
- 19. Conclusion
- 20. Reference • Callister, W. D., & Rethwisch, D. G. (2009). Material Science and Engineering : An Introduction (8th ed.). Hoboken, NJ: John Wiley and Sons Inc. • Ashby, M. F. (2011). Materials Selection in Mechanical Design (84th ed.). Oxford: Butterworth-Heineman. • Beale, A. (2011, February). Polycarbonate and ABS Engineering Resins Markets See Global • Tightening. Plastics Business Magazine. Retrieved January 21, 2013, from http:// www.plasticsbusinessmag.com/article.asp?ID=91 • Cambridge Engineering Selector, EduPack, 2012, Version 11.9.9 • Kondratov, L. A. (2012). Production and use of stainless steel.Metallurgist, 56(3), 225-228. doi: 1 0.1007/s11015-012-9563-2. • Makarov, G. S. (2002). Production of aluminum alloys: Status and prospects. Metallurgist, 46(11), doi: 10.1023/A:1022934315484. • Manning, M. (2012, May/June). Global Polycarbonate Demand to Grow by 5% a Year.Medical Plastic News. • Material Hardness. (n.d.). The Center for Advanced Life Cycle Engineering. Retrieved January 20, 2013, from http://www.calce.umd.edu/ • Pelleg, J., & SpringerLink ebooks - Engineering. (2012).Mechanical properties of materials. New York: Springer Netherlands.