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Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator

Easily calculate and compute polymer extrusion die swell (barus effect tanner equation) calculator with accurate equations, live formulas, and expert guidance.

Calculated Result
1.19 ratio

Die Swell Ratio (B = D_extrudate / D_die)

Die Swell Ratio (B = D_extrudate / D_die)

1.19 ratio

Die Swell Ratio B

1.1851490288519615

Final Extrudate Diameter Mm

2.370298057703923

Recoverable Shear Strain S R

1.125

Percentage Expansion Percent

18.51490288519615

1.19 — ratio

Calculation Breakdown

  1. Applied FormulaPredicts extrudate post-die elastic expansion (die swell ratio B) resulting from first normal stress difference (N1) relaxation using Tanner’s classic viscoelastic recovery equation.B = \frac{D_{\text{ext}}}{D_{\text{die}}} = \left[ 1 + \frac{1}{2} \left( \frac{N_1}{2 \tau_w} \right)^2 \right]^{1/6} + 0.1

Polymer Die Swell (Tanner) Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.60.91.2Die Swell Ratio (B = D_extrudate / D_die)

What Is the Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator?

The Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator computes results using established domain formulas, verified conversion factors, and user-entered parameters.

How Does the Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator Work?

Predicts extrudate post-die elastic expansion (die swell ratio B) resulting from first normal stress difference (N1) relaxation using Tanner’s classic viscoelastic recovery equation.

Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

B=DextDdie=[1+12(N12τw)2]1/6+0.1B = \frac{D_{\text{ext}}}{D_{\text{die}}} = \left[ 1 + \frac{1}{2} \left( \frac{N_1}{2 \tau_w} \right)^2 \right]^{1/6} + 0.1

Predicts extrudate post-die elastic expansion (die swell ratio B) resulting from first normal stress difference (N1) relaxation using Tanner’s classic viscoelastic recovery equation.

How to Use the Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Polymer Extrusion Die Swell (Barus Effect Tanner Equation) Calculator Example

Input Values:

dieExitDiameterMm:2
wallShearStressKpa:80
firstNormalStressDifferenceKpa:180
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required ratio.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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