Sewing

Seam Strength

Tensile seam strength estimate.

Measured maximum seam force

Seam length

User-entered required minimum for this index

Import tool JSON

Formula or method

Seam strength index = measured maximum seam force (N) ÷ seam length (mm), reported in N/mm; disposition compares that index with the user-entered minimum for the same index.

Worked example

Inputs: {"measuredForce":100,"seamLength":2,"requiredMinimum":45}
Substitution: Seam strength index = measured maximum seam force (N) ÷ seam length (mm), reported in N/mm; disposition compares that index with the user-entered minimum for the same index.
Result: 50

Assumptions

Force and length are entered in the displayed units, so the index is expressed in newtons per millimetre.

Limitations

ISO 13935 reports the maximum seam force of a specimen in newtons, not a force-per-length index, so this normalised index is an internal comparison only and is not a standard test result or certification.
Compare the retained maximum seam force with the standard's requirement; compare the index only with an index limit you set.

Seam Strength

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