- Astm E8 Tensile Specimen Dimensions Per
- Astm E8 Standard
- Astm E8 Tensile Specimen Dimensions
- Astm E8 Tensile Specimen Dimensions Guide
The tensile test on metals or metallic materials, is mainly based on DIN EN ISO 6892-1 and ASTM E8.Both standards specify specimen shapes and their testing. The objective of the standards is to define and establish the test method in such a way, that even when different testing systems are used, the characteristic values to be determined remain reproducible and correct. ASTM A370 tensile testing is very similar to ASTM E8 in that the specimens are either round or flat. Flat samples are generally tested with serrated jaw inserts while round samples use a V-insert. The size of the jaw inserts determines the allowable sample thickness within the grips.
What is ASTM E8 and E8M Tensile Testing?
- ASTM D638 is performed by applying a tensile force to a sample specimen and measuring various properties of the specimen under stress. It is conducted on a universal testing machine (also called a tensile testing machine) at tensile rates ranging from 1 to 500 mm/min until the specimen fails (yields or breaks).
- Dec 07, 2017 When the correct tensile specimen dimensions are achieved, the micrometer dial will stop turning, thus preventing cutting an undersized test specimen. After removing the completed ASTM E8 or other specimen from the master template, the tensile bar is ready for immediate testing.
- Specimens for ASTM D638 are dumbbell-shaped with either a 25 mm or 50 mm gauge length; a 50 mm gauge length is recommended. Gauge length changes with ASTM E83 Class B-2 accuracy; an absolute accuracy of 10 μm for a 50 mm gauge length and relative accuracy within ±0.5% are required by ASTM D638 for measuring the tensile modulus of elasticity.
ASTM E8 and E8M testing methods describes the tensile testing of metallic materials in various forms. Specifically, the test determines the yield strength, yield point elongation, tensile strength, elongation and reduction of area. The information gathered by tensile tests are crucial in the comparison of materials, alloy creation and designing processes. Furthermore, the standardization of testing methods are widely accepted and used for testing of commercial materials. It’s important to note that the only difference between E8 and E8M testing is the gage lengths of round specimen but the actual testing is identical.
Equipment Required
Tensile Tester – Capacity of Tensile Tester depends on the size and the ultimate tensile strength of the specimen. Speak to one of our sales engineers for possible accommodations. Frank Bacon Machinery has over 250 tensile testers in stock in various makes, models and capacities
Extensometer – Extensometer should have gage lengths equal to or shorter than the length of the reduced section of the specimen. It should also have enough travel to accommodate the elongation of the sample.
Grips – Wedge Grips are most commonly used however various types of grips may be used depending on the sample type.
Testing Software – We recommend MTESTQuattro software for all your tensile testing needs.
Astm E8 Tensile Specimen Dimensions Per
ASTM E8 & E8M Procedure
• Size the specimen according to ASTM E8/E8M specifications. Refx nexus 2 mac free trial. Specimens can be either round, flat, wire, pipe or tube. This can be performed using a Tensilkut, Mill, Lathe or Die.
Astm E8 Standard
• Gage punch the sample for both round and flat specimen. Select the correct guage length based on the specimen size you will be testing. This will give you the initial length for calculating elongation.
Astm E8 Tensile Specimen Dimensions
• Measure the width and thickness for flat specimens and the diameter of round specimens. This will allow you or the software to calculate the cross section area required to calculate the stress value.
• Place the specimen into the tensile tester. Flat or Vee wedge grips, threaded holder or shouldered button head holders are the most common ways of holding the specimens. Place the extensometer on the specimen. The extensometer will allow the software to automatically calculate the .02% offset yield.
• Start the test by applying the load to the specimen. The typical loading rate for ASTM E8/E8M is .2 inches/min. Once the specimen has yielded, stop the machine and remove the extensometer. With a fully computer controlled tensile tester the software will stop the machine and tell the operator to remove the extensometer. Once the extensometer has been removed, continue the test until the specimen fractures. The test can be resumed with a faster rate of load to minimize the test time.
Astm E8 Tensile Specimen Dimensions Guide
• Once the test specimen fails, remove the specimen and put the pieces together to measure the final distance between gage marks. This will be used for the calculation of percent elongation.
• Put together a test report with the Yield Strength (.02% offset), Tensile Strength and Elongation results (Y, T & E). A stress vs. strain graph or load vs displacement graph could also be added to the test report.
• The test is now completed! If you are looking to get started with ASTM E8/E8M testing in house please contact a sales engineer ([email protected]) at Frank Bacon Machinery to discuss your specific testing requirements. If you are looking to outsource your testing please contact [email protected] to get pricing and information on testing services.
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