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.
Ensure the support and loading rollers are free to rotate and articulate to completely eliminate parasitic twist stresses.
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.
Always sandblast and solvent-wipe the steel loading plates to bare metal immediately before applying epoxy to prevent premature bond line…
Cure the bonded block assembly under a uniform dead-weight load to ensure a perfectly flat, parallel adhesive layer.
Grind the loaded ends of the sandwich panel flat and perpendicular to the facings within 0.02mm to eliminate edge stress…
Always use a direct-contact deflectometer setup to measure core deflection; crosshead travel includes platen-seating errors.
Always place the specified elastomer pads between the anvils and the panel to spread out high localized line loads.
Always roll the tape onto the steel plate with a standardized mechanical roller at a uniform speed to eliminate manual…
Always insert spacer shims equal to the coupon thickness into the grips to guarantee a perfectly straight axial line of…
Inspect your cutting die under magnification frequently; even microscopic nicks on the blade cause severe, low-biased tear outliers.
Always apply the static bending load to the natural molded face of the panel, and cross-reference thickness variations down to…
Cut the foam blocks with a precision bandsaw or hot-wire setup to ensure the loading faces are perfectly flat and…
Always apply the exact standard-specified pre-tension (typically 0.5 cN / tex) to remove structural slack before zeroing strain metrics.
Align the pre-cut tongue lines perfectly parallel with the grip edges to ensure the tearing vector propagates straight down the…
Always track and document sheet extrusion direction; test samples in both longitudinal and transverse axes to chart directional variation.
Inspect specimens under a microscope post-test; you must verify that the failure was true interlaminar shear and not top-edge crushing.
Clean the stainless steel probe tip with reagent-grade toluene or isopropyl alcohol and a lint-free wipe before every single stroke.