Yield and .2% Offset Yield In Tensile Testing
Instron 4507 Tensile Testing Machine available for sale at Frank Bacon Machinery Sales Co.
Working Definition of Tensile Testing
When using a tensile tester to test a material, important information to gather includes offset yield strength. Yield Strength identifies the stress at which the material deformation begins and the integrity of the material is compromised. Offset yield strength is the point where a line drawn parallel to the modulus line intersects the stress-strain curve.
It is the measurement of the maximum or breaking load (tensile strength). Tensile strength is the resistance of a material to breaking when pulled. We depend on tensile strength in metal & alloys, rubber & plastics, leather & textiles.
Tensile testing is used in a variety of industries. In medical, safety and occupational. We want to make sure the seatbelts we use daily will not let go of our loved ones, and that the medical devices are strong enough to withhold procedures they are made for.
The 0.2% offset yield strength is defined as the amount of stress that will result in a plastic strain of 0.2%. This is the yield strength that is most often used by engineers and suppliers.
Material Testing:
Material testing tells more than just break and elongation.
Measuring what happens between the start of the pull test and when the sample actually breaks. Gives more information. Emphasis on breaking force, yield, slope and elongation.
Yield is when sample reaches deformation. The test results shown below are on a stress v. strain graph. The analysis provides maximum load, maximum stress, and yield.
Stress V. Strain Frank Bacon Test Results
An extensometer may be used as well, a device that is used to measure changes in the length of an object.
In a material test we care about what happens to material. For example: how far it stretches, when it becomes deformed. From there an assessment can be done on the sample to understand if anything needs to be changed and if more material needs to be added to it.
The test results below show are shown in load V. position. The customer wanted to find the maximum load as seen in the analysis results.
Stress V. Strain Frank Bacon Test Results
Contact Frank Bacon Today!
If you have any questions or are looking for a tensile tester please contact a sales engineer at Frank Bacon. We will walk you through the whole process and give you a customized turnkey machine.
Phone: 586.756.4280
Toll Free: 800- 394-4280