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.
Measure both the pin outer diameter and hole inner diameter to the nearest 0.01mm to document exact clearance values.
Always grind or deburr the sheared longitudinal edges of the bend specimen to a smooth radius to prevent invalid edge-tear…
The active gauge area must be polished longitudinally to a mirror finish (down to 0.2-micron roughness) to eliminate circumferential machining…
Ensure the specimen edges are polished completely free of blanking burrs; even minor edge roughness skews the transverse width extensometer…
Always apply a standardized, high-pressure grease lubricant uniformly to the punch apex to guarantee pure, friction-free stretch-forming dynamics.
Always verify that the linear regression regression coefficient (R^2) exceeds 0.995; a lower value indicates invalid data collection or localized…
Always configure the closed-loop controller to run under automated strain-rate control (0.015 mm/mm/min) during the critical yield envelope.