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Impact test on metals

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Impact test on metals

1. 1. Chittagong University of Engineering & TechnologyChittagong University of Engineering & Technology Department of Civil EngineeringDepartment of Civil Engineering Impact Test on MetalsImpact Test on MetalsImpact Test on MetalsImpact Test on Metals Present By AL – MASUM B.Sc in Civil Engineering Pursuing at Chittagong University of Engineering & Technology Chittagong-4349 , Bangladesh
2. 2. What isWhat is ImpactImpact oror Impact ForceImpact Force ??  In mechanicsIn mechanics, an impact is, an impact is a high force or shocka high force or shock applied over aapplied over a short time periodshort time period when two or more bodieswhen two or more bodies collidecollide. Such a force or. Such a force or acceleration usually has a greater effect than a lower force appliedacceleration usually has a greater effect than a lower force applied over a proportionally longer period. The effect depends critically onover a proportionally longer period. The effect depends critically on the relative velocity of the bodies to one another.the relative velocity of the bodies to one another.  Example :Example : car crush, wind force, earthquakecar crush, wind force, earthquake etc.etc.
3. 3. Why impact test is necessary?Why impact test is necessary?  To measureTo measure Impact energyImpact energy - the energy required to break a- the energy required to break a standard sized sample with a sudden, sharp load.standard sized sample with a sudden, sharp load.  FindFind ToughnessToughness - the impact test is used to find a material's- the impact test is used to find a material's toughness , it's ability to absorb energy without breaking.toughness , it's ability to absorb energy without breaking.  To determine the tendency of a material in aTo determine the tendency of a material in a brittle mannerbrittle manner .It.It detects difference between materials which are not in a tension test.detects difference between materials which are not in a tension test.
4. 4. Test Method & Standard SpecimenTest Method & Standard Specimen  The most common methods of performing impact test are -The most common methods of performing impact test are - 1. Charpy Test Method1. Charpy Test Method 2. Izod Test Method .2. Izod Test Method .  The Standard Size of Charpy impact test Specimen is 10mm xThe Standard Size of Charpy impact test Specimen is 10mm x 10mm x 55mm with 2mm deep notch at the middle of a specified10mm x 55mm with 2mm deep notch at the middle of a specified surface. The notch should be V shaped & 45degree angled.surface. The notch should be V shaped & 45degree angled. Fig : V notch Specimen  The Standard Size of Izod impact testThe Standard Size of Izod impact test Specimen is 64mm x 12.7mm x 3.2mm .Specimen is 64mm x 12.7mm x 3.2mm . The V notch Shaped bar is also used .The V notch Shaped bar is also used .
5. 5. Charpy test MethodCharpy test Method  The Charpy impact test, also known asThe Charpy impact test, also known as the Charpy V-notch testthe Charpy V-notch test,, is a standardized high strain-rate test which determinesis a standardized high strain-rate test which determines thethe amount of energy absorbedamount of energy absorbed by a materialby a material during fractureduring fracture..  The specimen is set likeThe specimen is set like a simply supported beam.a simply supported beam.
6. 6. Izod test MethodIzod test Method  The test piece isThe test piece is a cantilevera cantilever, clamped upright in an anvil, with a V, clamped upright in an anvil, with a V notch at the level of the top of the clamp.notch at the level of the top of the clamp.  The test piece is hit by a striker carried on a pendulum which isThe test piece is hit by a striker carried on a pendulum which is allowed to fall freelyallowed to fall freely from a fixed heightfrom a fixed height, to give a blow of, to give a blow of 120 ft lb120 ft lb energy.energy.
7. 7. ProcedureProcedure
8. 8. Preparation ofof testtest piecepiece ProcedureProcedure Place the sample in positionPlace the sample in position
9. 9. CalculationCalculation  Impact energyImpact energy = mgH-mghmgH-mgh ; Where, m=mass of pendulum. g=acceleration due to gravity.=9.81ms-2 The absorb energy in Joule Unit. Fig : Impact energy
10. 10. Difference between Charpy & Izod testDifference between Charpy & Izod test In Charpy method the Specimen set is like aIn Charpy method the Specimen set is like a simply Supportedsimply Supported beambeam On other hand in Izod method the Specimen set is like aOn other hand in Izod method the Specimen set is like a CantileverCantilever.. Thus Why in Charpy method gives aThus Why in Charpy method gives a higher readinghigher reading than the Izodthan the Izod method.method.
11. 11. THANKTHANK YOUYOU