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Polymer Extrusion Die Swell Ratio & Extrudate Expansion Calculator

Easily calculate and compute polymer extrusion die swell ratio & extrudate expansion calculator with accurate equations, live formulas, and expert guidance.

Circular die exit diameter.

Elastic normal stress at die wall.

Shear stress at the die boundary.

Calculated Result
1.05

Die Swell Ratio B

Die Swell Ratio B

1.05

Die Swell Ratio B

1.05

Final Extrudate Diameter Mm

3.16

Recoverable Shear Strain Gamma Rec

0.85

Cross Sectional Area Expansion Pct

10.8

1.05

Calculation Breakdown

  1. Applied FormulaApplies Tanner’s elastic recovery equation to predict extrudate swell (Barus effect) caused by stored elastic normal stresses relaxing upon exiting the extrusion die.B = \left[ 1 + \frac{1}{2}\gamma_R^2 \right]^{1/6}

Extrusion Die Swell Ratio Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.1Die Swell Ratio B

What Is the Polymer Extrusion Die Swell Ratio & Extrudate Expansion Calculator?

This tool computes polymer extrusion die swell ratio & extrudate expansion calculator with high precision arithmetic.

How Does the Polymer Extrusion Die Swell Ratio & Extrudate Expansion Calculator Work?

Applies Tanner’s elastic recovery equation to predict extrudate swell (Barus effect) caused by stored elastic normal stresses relaxing upon exiting the extrusion die.

Polymer Extrusion Die Swell Ratio & Extrudate Expansion Calculator Formula & Variables

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

B=[1+12γR2]1/6B = \left[ 1 + \frac{1}{2}\gamma_R^2 \right]^{1/6}

Applies Tanner’s elastic recovery equation to predict extrudate swell (Barus effect) caused by stored elastic normal stresses relaxing upon exiting the extrusion die.

How to Use the Polymer Extrusion Die Swell Ratio & Extrudate Expansion Calculator

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

Step-by-Step Example Calculation

Polymer Extrusion Die Swell Ratio & Extrudate Expansion Calculator Example

Input Values:

dieOrificeDiameterMm:3.0
firstNormalStressDifferenceN1Kpa:85.0
wallShearStressTauWKpa:50.0
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required Die Swell Ratio B.

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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