Testing Products for ASTM D7791
FatiguePhase Shift: High-frequency cycling can introduce a lag between force and displacement data.
Browse validated testing configurations. Filter by regulatory standard, material type, or force requirements.
78 items found
Phase Shift: High-frequency cycling can introduce a lag between force and displacement data.
Compliance Errors: Measuring crosshead travel includes machine squish.
The Edge Effect: Any tiny nick in the side of the film strip from a dull blade will cause a…
The 180° Rule: The flexible part is folded back on itself and pulled parallel to the bond.
The 5% Rule: Bending strain must be less than 5% of the axial strain for a Perfect machine.
Pin Fit: The clearance between the pin and the hole must be tight to avoid point loading stress.
A qualitative test to determine if a metal can be bent to a specific radius without cracking on the outer…
Determines the resistance of a material to crack propagation. Requires a fatigue-pre-cracked specimen.
Surface Finish: Scratches perpendicular to the load act as stress risers and drastically shorten fatigue life.
The Yield Point: Metals have a specific kick in the curve (0.2% Offset).
A variation of fracture testing for very brittle materials where KIc might not be valid due to specimen size.
Perfect Parallelism: If the cylinder ends aren’t ground flat to within 0.001″, it will kick sideways.
Bio-Environment: Testing should be done in a BioBath heated saline bath (37°C) to simulate the human body.
Critical for medical stents. Captures the loading plateau and unloading plateau of Shape Memory Alloys.
Bio-Simulation: Bone plates must survive millions of cycles of walking loads without snapping.
Wedge Angle: Using a 10° wedge under the bolt head tests the strength of the head-to-shank transition.
Tail Support: Decide if the tail is supported at 90° or hanging free; this must be documented in the report.
H/D Ratio: The height-to-diameter ratio must be 1.0 or 1.5 to prevent buckling.
The S Specimens: DIN uses different dumbbell shapes (S1-S3) than ASTM D412 (Dies A-F).
Core Failure: The foam core usually fails before the metal skins or the adhesive bond.