Tensile Test Procedure
Depending on the test standard, the gauge length is either 2 inches, 80 mm, or 50 mm. Multiplying the width and thickness within the gauge length determines the initial cross-sectional area before testing. Grips tightly clamp the edges of the sample at opposite ends.
Beside this, what are ASTM standards?
ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services.
In respect to this, what is ASTM standard for tensile test?
ASTM D638 is the most common testing standard for determining the tensile properties of reinforced and non-reinforced plastics. With the use of plastics being at an all-time high, it is critical that manufacturers be able to properly gauge the mechanical strength of their materials.
What is tensile specimen?
A tensile specimen made of a superplastic metal when tested at the proper temperature at a low enough rate will undergo over 1000% elongation and will stretch like viscous glass into a fiber before separation. From: Encyclopedia of Physical Science and Technology (Third Edition), 2003.
What is the difference between E8 and E8M?
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.
What is the maximum thickness suggested for a rectangular tensile test specimen with a width of 12.5 mm?
Maximum thickness of 12.5 and 6 mm [0.500 and 0.250 in.] wide specimens shall be 19 and 6 mm [0.750 and 0.250 in.], respectively.
What is the shape of tensile test specimen?
For tensile test , the specimen is so shaped that the failure occurs in the mid section of the specimen, where you always concentrate for measuring the changes in the cross sectional dimensions. So our interest is to induce failure in the same section hence we have a dumbbell shape.
What is the standard diameter of a specimen used in an ASTM tensile test?
However, the most common specimen is a dogbone-shaped rectangle with a width of 12.5 mm (0.5 in) and gauge length of 50 mm (2 in).
Why a dog bone shape is used for the tensile test?
This information is determined by means of a simple tensile test. For most materials, a dog bone shape is used in order to promote a failure within the gauge length of the extensometer and prevent grip end failures, but not for composites.
Why the tensile samples are dog bone shaped?
The purpose of the Dog-bone specimen is to help direct stress/strain to the narrowest part of the specimen (the gauge length). It is best to take data from samples which break in the middle. If your samples break in the middle consistently it is an indicator that it could be a suitable sample shape.
Why the tensile test specimen is in Dogbone shape?
Therefore, a dog bone sample is designed to ensure the highest probability that the sample will fail due to maximum tensile loading.