lab2 - Analysis of Results 1. -1025-825-625-425-225-25 175

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Unformatted text preview: Analysis of Results 1. -1025-825-625-425-225-25 175 375-3.5-3-2.5-2-1.5-1-0.5 0.5 1 Strain(%) Stress(MPa) Figure 1: Engineering stress vs. engineering strain for cast iron-800-600-400-200 200 400 600 800-3 2 7 12 17 22 Strain(%) Stress(MPa) Figure 2: Engineering stress vs. engineering strain for steel 1045 1-500-400-300-200-100 100 200 300 400-20-15-10-5 5 10 15 20 Strain(%) Stress(MPa) Figure 3: Engineering stress vs. engineering strain for aluminum 6061-150-100-50 50 100-30-25-20-15-10-5 5 10 Position(mm) Stress(MPa) Figure 4: Stress vs. position for PMMA 2 2. Refer to question 3 in question four for the computed modulus of elasticity, the yield strength, and the ultimate strength in compression. 3. -800-700-600-500-400-300-200-100-3-2.5-2-1.5-1-0.5 0.5 Strain(%) Stress(MPa) Figure 5: True stress vs. true strain (pink) plotted with engineering stress vs. strain (blue) for steel 1045 3 4. Table 1-Compression and hardness data Measurement or property Material Quantity Symbo l Units Cast Iron 1045Stee l 6061 Alum PMMA Initial Data Diameter d mm 12.72 12.68 12.71 19.12 Cross-sectional area A mm 2 127 126 127 287 Gage length l mm 40 40 40 65 Strength Approximate yield load P y kN 60.8 84.3 36.6 29 Approximate max. load P max kN 100 100 84.4 33.3 Reason for stopping test-- Max load Max load max load failure Final shape or fracture-- cylinder cylinder buckled cylinder fractured/several pieces Hardness-Rockwell B (1/16" ball, 100 kg) Overall Hardness reading HRB- 99.8 99.5 48.8 N/A Correction for curvature HRB- 1.5 1.5 4.0 N/A Rockwell hardness HRB- 101.3 101 50.8 N/A Brinell Hardness HB kg/mm^2 246 246 N/A N/A Table 2b-Comparative hardness data (lab section average) Measurement or Property Material Quantity Symbol Units 4340 Steel 6061 Al Hardness-Brinell (ball diameter D=10mm; indenter load=3000kg) Brinell hardness number HB kg/mm^2 675 99.5 Hardness-Rockwell B and C Rockwell B hardness number HRB- 120 58.5 Rockwell C hardness number HRC- 61.1-23.7 Brinell hardness (conveted from Rockwell C or Rockwell B) Converted Brinell hardness number HB kg/mm^2 670 106 Table 3-Summary of Results 4 Mechanical Property Material Quantity Symbol Units Cast Iron 1045Steel 6061 Alum PMMA Tensile Properties (from Tensile Test Lab) Young's modulus...
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This lab report was uploaded on 04/20/2008 for the course GE 312 taught by Professor Reis during the Spring '06 term at University of Illinois at Urbana–Champaign.

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lab2 - Analysis of Results 1. -1025-825-625-425-225-25 175

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