Mechanical Failure: Brittle Fracture and Impact Testing
FAKULTI TEKNOLOGI KEJURUTERAAN
UNIVERSITI TEKNIKAL MALAYSIA MELAKA | ENGINEERING MATERIALS | BKTP 1313 | SEMESTER 2 | SESI 2012/2013 | LAB 4: IMPACT TEST | NAME | | MATRIX NUMBER | | COURSE | | DATE | 02 / 05 /2013 | NAME OF INSTRUCTOR | 1.. | | 2. | EXAMINER’S COMMENT | VERIFICATION STAMP | | TOTAL MARKSProcedure: /15Data recording: /15
Results: /15Discussion: /15Questions: /30Conclusion: /10 |
OBJECTIVE 1. To study the principle of impact testing by understanding the resistance of a material to crack propagation can be determined using impact test. 2. To characterize the impact fracture behavior of different temperature. 3. To determine the energy absorbed during fracture. 4. To understand the difference between brittle and ductile fracture and the energy absorbed in each condition. 5. To interpret the obtained experimental data for the selection of engineering materials.
EQUIPMENT AND APPARATUS
1. Impact testing machine 2. Copper alloy rod (D 6mm) 3. Aluminum alloy rod (D 6mm) 4. Teflon rod (D 6mm) 5. Handsaw 6. Verniercaliper 7. Beakers 8. Oven 9. Gloves 10. Tongs 11. Thermometer 12. Ice cube 13. NaCl (salt) 14. Water 15. Bunsen burner
SYNOPSIS ADN THEORY
Notched-bar impact test of metals provides information on failure mode under high velocity loading conditions leading sudden fracture where a sharp stress raiser (notch) is present. The energy absorbed at fracture is generally related to the area under the stress-strain curve which is termed as toughness in some references. Brittle materials have a small area under the stress-strain curve (due to its limited toughness) and as a result, little energy is absorbed during impact failure. As plastic deformation capability of the materials
UNIVERSITI TEKNIKAL MALAYSIA MELAKA | ENGINEERING MATERIALS | BKTP 1313 | SEMESTER 2 | SESI 2012/2013 | LAB 4: IMPACT TEST | NAME | | MATRIX NUMBER | | COURSE | | DATE | 02 / 05 /2013 | NAME OF INSTRUCTOR | 1.. | | 2. | EXAMINER’S COMMENT | VERIFICATION STAMP | | TOTAL MARKSProcedure: /15Data recording: /15
Results: /15Discussion: /15Questions: /30Conclusion: /10 |
OBJECTIVE 1. To study the principle of impact testing by understanding the resistance of a material to crack propagation can be determined using impact test. 2. To characterize the impact fracture behavior of different temperature. 3. To determine the energy absorbed during fracture. 4. To understand the difference between brittle and ductile fracture and the energy absorbed in each condition. 5. To interpret the obtained experimental data for the selection of engineering materials.
EQUIPMENT AND APPARATUS
1. Impact testing machine 2. Copper alloy rod (D 6mm) 3. Aluminum alloy rod (D 6mm) 4. Teflon rod (D 6mm) 5. Handsaw 6. Verniercaliper 7. Beakers 8. Oven 9. Gloves 10. Tongs 11. Thermometer 12. Ice cube 13. NaCl (salt) 14. Water 15. Bunsen burner
SYNOPSIS ADN THEORY
Notched-bar impact test of metals provides information on failure mode under high velocity loading conditions leading sudden fracture where a sharp stress raiser (notch) is present. The energy absorbed at fracture is generally related to the area under the stress-strain curve which is termed as toughness in some references. Brittle materials have a small area under the stress-strain curve (due to its limited toughness) and as a result, little energy is absorbed during impact failure. As plastic deformation capability of the materials
References: * http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Mechanical/ImpactToughness.htm * http://en.wikipedia.org/wiki/Charpy_impact_test * http://metals.about.com/library/bldef-Impact-Test.htm * http://composite.about.com/library/glossary/c/bldef-c1035.htm