Clip on Extensometer: E-ASTM-D1623
ASTM- Video Extensometer
Foam Tension: Use very lightweight knife edges so the extensometer doesn’t tear the soft foam cells.
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Foam Tension: Use very lightweight knife edges so the extensometer doesn’t tear the soft foam cells.
Micro-Samples: Large extensometers will pull the sample out of the grips. Use the ultra-lightweight 3442 series.
Spring Rate: Do not use crosshead travel; the seating of the spring ends creates false initial displacement.
Brittle Failure: Ceramics have near-zero strain. A high-resolution deflectometer is the only way to capture modulus.
Wood Swell: Requires a long-range LVDT to monitor thickness changes during water immersion cycles.
Foam Squish: Avoid crosshead travel; the machine frame’s own compliance can be 10% of your foam’s total deformation.
For rigid materials, a deflectometer or a compressometer is vital because crosshead travel includes machine compliance (squish). Measuring crushing height…
A deflectometer measures the actual mid-span deflection, which is much more accurate than crosshead data. Note you need a deflection…
Metal Comp: Vital for Modulus of Elasticity. Crosshead travel is too noisy due to machine compliance.
Bone Plates: 4-point bend requires measuring the sag of the plate; use a deflectometer at the center.
Sandwich Panels: Measure core deflection using an LVDT on the underside; skin movement is misleading.
Composite Flex: Mandatory for Modulus. Use a Class 1 deflectometer per ISO 9513.
Similar to ASTM D790, but ISO is often stricter about Type 1 accuracy. The Epsilon 3540 (Deflectometer) is perfect here…