Make elongation comparable

The percentage needs a known specimen, load path and reading time.

Specimen
Record: Construction, lot, direction, conditioning and jaw protection
Project detail: ____________________
Confirm: Match the label and sample

Gauge setup
Record: Initial gauge length, marks, preload and zero point
Project detail: ____________________
Confirm: Photograph marks before loading

Load history
Record: Target force, loading rate, hold time and number of cycles
Project detail: ____________________
Confirm: Compare machine program and request

Loaded readings
Record: Extension on reaching force and during hold
Project detail: ____________________
Confirm: Read from the defined gauge marks

Recovery readings
Record: Length immediately after release and after stated intervals
Project detail: ____________________
Confirm: Return the specimen to the same support

Assembly separation
Record: Tape extension, seam movement and buckle slip observations
Project detail: ____________________
Confirm: Use independent marks at each interface

Forces, timing and limits are project-defined. Elongation at a force is not a safe working-load rating.

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