Table of Contents
Is Spider Silk Stronger Than Steel?
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In this video I test if spider silk is actually stronger than steel! I do a real life experiment with spider silk and steel wire to see which can hold more weight.
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Tensile Tester Universal Testing Machine (UTM)
Tensile Tester Universal Testing Machine (UTM)
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Understanding Young’s Modulus
Young’s modulus is a crucial mechanical property in engineering, as it defines the stiffness of a material and tells us how much it will deform for an applied stress.
In this video I take a detailed look at Young’s modulus, starting with tensile tests and stressstrain curves, all the way through to what is happening at the atomic scale.
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HYDRAULIC PRESS VS CARBON FIBER
Let’s check with the help of a 100ton hydraulic press, how strong is the carbon fiber?
Rubber and Elastomer Tensile Strength Test – ASTM D412
This shows a tensile strength and elongation test appropriate for rubbers, elastomers, and silicones, and performed according to ASTM D412 on an ADMET universal testing machine. For more information on the test and equipment visit http://info.admet.com/specifications/bid/34241/ASTMD412TensileStrengthPropertiesofRubberandElastomers
Testing the Tensile Properties of Plastics and Elastomers
Summary of Test
ASTM D412 covers the testing of tensile properties of thermoset rubbers and thermoplastic elastomers. The specification describes two test methods: A and B. Method A is common and can be performed on a universal testing machine (tensile testing machine). If you are going to perform this test, you should read the entire specification from ASTM. This is a quick summary to decide if ASTM D412 is right for you and to point out what equipment you need to perform the test.
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Test Procedure
To perform this test, cut your material into a “dogbone” shaped sample. Load the sample into a pair of tensile grips suitable for elastomers and attach your extensometer (if you have one). Begin the test by separating the tensile grips at a rate specified in the standard and run until sample break (rupture).
Calculations:
Stress at UserSpecified Extension or Elongation
Tensile Yield Stress
Tensile Yield Strain
Tensile Strength at Rupture
Elongation at Rupture
Equipment Required for ASTM D412
A Universal Testing Machine with the following specifications:
Servocontrol to ensure constant rate of speed during the test (+/ 2 inches per minute)
At least 30 inches of crosshead travel or more for higher elongation materials
A load capacity of at least 1kN
ADMET Recommends: eXpert 2600 Dual Column Testing Machine, eXpert 7600 Single Column Testing Machine
An extensometer is optional but recommended. We recommend using an extensometer for two reasons:
Dogbone specimens do not have uniform widths which can cause errors when both the wide and narrow sections of the dogbone shaped specimen elongate at different rates
Elongation is usually an important design characteristic of rubbers and elastomers so an extensometer can be used to improve accuracy of the measurement
ADMET Recommends: Extensometers
Software or suitable electronics are required to operate the machine and to take the measurements
Basic systems will provide the raw data and stressstrain charts. Using these data, you can determine and calculate all of the analyses listed above. Fully PCbased systems have the capability to calculate all of these automatically. ADMET offers both
ADMET Recommends: MTESTQuattro PCbased Controller
Tensile grips hold your specimen during the test as it is being pulled apart
Elastomers pose a challenge to hold because they thin as they are pulled axially. Therefore, the vast majority of elastomers need to be held with self tightening grips such as wedge, pneumatic, or eccentric roller design.
ADMET Recommends: Selftightening Tensile Grips, Wedge Grips, Pneumatic Grips
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