Tangential Shrinkage Calculator

Extract actual tangential shrinkage coefficients from paired dimensional/moisture-drop observations, negative apparent shrinkage retained; not forward carpenter movement coefficient. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.

Description

Tangential shrinkage compares dimensions measured along the tangential wood direction.

Tangential shrinkage compares dimensions measured along the tangential wood direction.^[1]

Dividing its fractional change by the measured moisture drop gives a protocol-dependent change per moisture percentage point. Use this tool to calculate tangential shrinkage from the supplied measurements and assumptions.

When to use Tangential Shrinkage Calculator

Use this tool to calculate tangential shrinkage from the supplied measurements and assumptions. Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.

How to use Tangential Shrinkage Calculator and understand its results

Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
Enter observedGreenTangentialLengthsMm, observedDryTangentialLengthsMm, observedMoistureDropPoints, using the field meanings and rules below, then run the tool.
Read observedShrinkageFractions, observedFractionShrinkagePerMoisturePoint. Interpret the fields using their units, signs and evidence conventions below.
If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.

Input field	Meaning	Value type	Requirement
observedGreenTangentialLengthsMm	Observed green tangential lengths mm	list of number	Required
observedDryTangentialLengthsMm	Observed dry tangential lengths mm	list of number	Required
observedMoistureDropPoints	Observed moisture drop points	list of number	Required

Enter nonempty aligned positive green and dry dimensions and positive moisture-drop percentage points. Compute 1−dry/green as a signed shrinkage fraction and divide it by the moisture drop to return fraction per percentage point. Negative shrinkage from expansion is retained; no percent scaling or conditioning correction occurs.

shrinkageFraction_i=1−dryDimension_i/greenDimension_i; fractionPerMoisturePoint_i=shrinkageFraction_i/moistureDropPoints_i

Use the exact units, boundary rules, ordering and missing-evidence conventions above.

Output field	Meaning	Value type
observedShrinkageFractions	Observed Shrinkage Fractions; follow the units, sign, ordering and evidence convention stated above	list of number
observedFractionShrinkagePerMoisturePoint	Observed Fraction Shrinkage Per Moisture Point; follow the units, sign, ordering and evidence convention stated above	list of number

json

{
  "input": {
    "observedGreenTangentialLengthsMm": [
      100,
      200
    ],
    "observedDryTangentialLengthsMm": [
      90,
      190
    ],
    "observedMoistureDropPoints": [
      10,
      20
    ]
  },
  "output": {
    "observedShrinkageFractions": [
      0.09999999999999998,
      0.050000000000000044
    ],
    "observedFractionShrinkagePerMoisturePoint": [
      0.009999999999999998,
      0.0025000000000000022
    ]
  }
}

Limitations and assumptions

Dividing its fractional change by the measured moisture drop gives a protocol-dependent change per moisture percentage point. Interpretation depends on the units, sampling scope and exact model described above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.

Alternative or Complementary methods

Use Basic Wood Density Lookup for this related task: Basic wood density uses a specified dry-mass and volume convention.

Use Stere to Cubic Meter Roundwood Converter when its separate inputs and assumptions fit the question: A stere measures stacked wood volume including spaces between pieces.

References

Tangential Shrinkage Calculator — tool.io

Similar or alternative tools

Basic Wood Density Lookup
Basic wood density uses a specified dry-mass and volume convention.
Stere to Cubic Meter Roundwood Converter
A stere measures stacked wood volume including spaces between pieces.