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Extruder Die Swell Ratio (Barus Effect) & Elastic Recovery Calculator

Easily calculate and compute extruder die swell ratio (barus effect) & elastic recovery calculator with accurate equations, live formulas, and expert guidance.

Calculated Result
1.05 ratio

Extrudate Die Swell Ratio (B = D_ext / D_die)

Extrudate Die Swell Ratio (B = D_ext / D_die)

1.05 ratio

Extrudate Area Expansion Pct

10.2

Recoverable Shear Elastic Strain

0.92

1.05 — ratio

Calculation Breakdown

  1. Applied FormulaCalculates extrudate cross-sectional expansion upon exiting profile, pipe, and filament dies caused by elastic energy recovery (Barus effect / normal stresses).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} + 0.13

Die Swell Ratio (Barus) Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.1Extrudate Die Swell Ratio (B = D_ext / D_die)

What Is the Extruder Die Swell Ratio (Barus Effect) & Elastic Recovery Calculator?

This tool computes extruder die swell ratio (barus effect) & elastic recovery calculator with high precision arithmetic.

How Does the Extruder Die Swell Ratio (Barus Effect) & Elastic Recovery Calculator Work?

Calculates extrudate cross-sectional expansion upon exiting profile, pipe, and filament dies caused by elastic energy recovery (Barus effect / normal stresses).

Extruder Die Swell Ratio (Barus Effect) & Elastic Recovery Calculator Formula & Variables

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

B=DextDdie=[1+12(N12τw)2]1/6+0.13B = \frac{D_{\text{ext}}}{D_{\text{die}}} = \left[ 1 + \frac{1}{2} \left( \frac{N_1}{2 \tau_w} \right)^2 \right]^{1/6} + 0.13

Calculates extrudate cross-sectional expansion upon exiting profile, pipe, and filament dies caused by elastic energy recovery (Barus effect / normal stresses).

How to Use the Extruder Die Swell Ratio (Barus Effect) & Elastic Recovery Calculator

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

Step-by-Step Example Calculation

Extruder Die Swell Ratio (Barus Effect) & Elastic Recovery Calculator Example

Input Values:

firstNormalStressDifferenceKpa:120
wallShearStressKpa:65
dieLengthToDiameterRatioLOverD:15
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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