Challenge 3: Strain Measurements from Modulus to Break
When testing various plastics it can be difficult to select an extensometer that is capable of accurately measuring modulus and strain at break. This is true for extensometers where accuracy is inversely proportional to travel and the strain at break is 50% or higher, which is common for many thermoplastics.
Solution: For operators that remove the extensometer at yield or test materials that strain less than 50%, a traditional clip-on style extensometer is highly recommended. For operators testing higher elongation materials to failure, we have two recommendations:
1. For non-contacting measurement, the video extensometer is an excellent choice.
2. For contacting solutions, we recommend an automatic contacting extensometer where the measuring arms are counterbalanced and operate on a nearly frictionless linear guidance system.
When testing various plastics it can be difficult to select an extensometer that is capable of accurately measuring modulus and strain at break. This is true for extensometers where accuracy is inversely proportional to travel and the strain at break is 50% or higher, which is common for many thermoplastics.
Solution: For operators that remove the extensometer at yield or test materials that strain less than 50%, a traditional clip-on style extensometer is highly recommended. For operators testing higher elongation materials to failure, we have two recommendations:
1. For non-contacting measurement, the video extensometer is an excellent choice.
2. For contacting solutions, we recommend an automatic contacting extensometer where the measuring arms are counterbalanced and operate on a nearly frictionless linear guidance system.
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