Regression analysis: Simple Linear Regression Multiple Linear Regression
Lecture 04
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4. Fracture strength Callister, Appendix B Note that the fracture strength for ceramics is about 10* better in compression than in tension. Body armor 69 Soda lime glass 13.8-69 Graphite 230-825 SiC (sintered) 1050 Diamond (natural) 800-1400 Diamond (synthetic) 37.3-41.3 Concrete 130 Si [100] cleaved 282-551 Al 2 O 3 (99.9% pure) Strength (MPa) Ceramic
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9. MEASURING FRACTURE STRENGTH • 3-point bend test to measure room T strength. Adapted from Fig. 12.29, Callister 6e. • Flexural strength: Flexural fracture strength is higher than the tensile fracture strength. Why? Test specimens undergo compressive and tensile loads instead of pure tension. Si carbide Al oxide glass (soda) 550-860 275-550 69 Data from Table 12.5, Callister 6e. circ.
10. MEASURING ELASTIC MODULUS • Room T behavior is usually elastic, with brittle failure. • Determine elastic (Young’s) modulus according to slope: Adapted from Fig. 12.29, Callister 6e. Si carbide Al oxide glass (soda) 430 390 69 Data from Table 12.5, Callister 6e.
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![Abrasives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],http://www.abrasiveengineering.com/eurostus.pdf Almost 3000 tons a day! 700 Sand 550 Glass 600 Steel 80 Nickel 2500 Silicon carbide (SiC) 2100 Alumina (AL2O3) 2100 Tungsten carbide (WC) 800 Quartz (SiO2) 1 Graphite 7000 Diamond (C) Knoop Hardness (100g load) Material 60 1150 550 Super (no gems) 850k 310 580 Loose 70k 850 1600 Coatings 65k 860 450 Bonded tons Europe $ US $ Abrasive use, 2002 http://www.chm.bris.ac.uk/pt/diamond](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)