ASTM A370 Test Guide: Tensile Testing for Metals
TensileAlways use an extensometer rated for high-velocity shocks, and remove it immediately after yield if testing to failure.
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Always use an extensometer rated for high-velocity shocks, and remove it immediately after yield if testing to failure.
Grind the chisel edge to the exact specified angle and sharpen regularly to maintain uniform shear force application.
Clean and prime the substrate blocks precisely according to the manufacturer’s spec to isolate true sealant engineering limits.
When performing the perpendicular tensile test, use a high-strength epoxy to bond the metal blocks uniformly across the fiber face.
Cure the bonded block assembly under a uniform dead-weight load to ensure a perfectly flat, parallel adhesive layer.
Always roll the tape onto the steel plate with a standardized mechanical roller at a uniform speed to eliminate manual…
Always apply the static bending load to the natural molded face of the panel, and cross-reference thickness variations down to…
Always apply the exact standard-specified pre-tension (typically 0.5 cN / tex) to remove structural slack before zeroing strain metrics.
Clean the stainless steel probe tip with reagent-grade toluene or isopropyl alcohol and a lint-free wipe before every single stroke.
Meticulously clean the stainless steel test plate with diacetone alcohol or n-heptane and a lint-free wipe before every single strip…
Never use standard manual screw grips; vulcanized rubber narrows drastically under tension and requires self-adjusting pneumatic jaws.
Meticulously document the exact failure mode split: R (Rubber Failure), RC (Rubber-Cement), CP (Cement-Primer), or M (Metal Interface).
Store and condition tape rolls at standard atmospheric limits for exactly 24 hours prior to slitting or testing to equalize…
Calibrate the precise initial distance between the roller axes using a solid reference spacer to guarantee an exact baseline loop…
Inspect the internal perimeter of the drilled hole under a microscope before testing; any evidence of fiber fraying or ply…
Always measure real specimen cross-section thickness at 3 distinct points before clamping; do not rely on nominal molded values.
Always apply a minimal, uniform pre-load (~0.5 cN / tex) prior to starting the test loop to eliminate structural slack…
Always use a dual-blade specimen cutter to guarantee perfectly smooth, nick-free parallel edges; even a microscopic nick will act as…
Always discard the first 25mm of peeling data from calculations; adhesive failure must reach steady-state equilibrium before capturing valid averages.
Always configure the closed-loop controller to run under automated strain-rate control (0.015 mm/mm/min) during the critical yield envelope.