Material Reliability Test of PLA Polymer Degradation

This App Note shows the approach of EAG Laboratories to test the material reliability of PLA Polymer Degradation

Reliability Test Approach

Test plan definition (define CtQ & pass-fail criteria) => experimental phase => data analysis => prediction model

Hydrolysis reaction of PLA:

Material Reliability Test Example

Degradation of polylactic acid (PLA) polymer – predictive life-time modelling for different use scenarios

Test Plan Definition — Accelerated Testing

PLA based polymers degrade when exposed to moisture, this chemical
degradation process is accelerated by temperature

Test Plan

Damp-heat storage tests at 3 T%RH combinations

Response Parameters

Mechanical degradation (tensile stress measurement) & Chemical degradation (FTIR measurement)

Experimental Phase

Data Analysis

The mechanical degradation data, the chemical degradation data or both can be analyzed using Reliability software

Damp-heat test 25°C/95%RH – 60°C/50%RH – 60°C/95%RH

1A: Find degradation model that fits the experimental data set
1B: Definition fail level (for example 30% remaining strength or 30% chemical degradation

2A: Choose a reliability failure mechanism acceleration model (Arrhenius, Eyring, Temp-humidity…)
2B: Choose life distribution that fits the fail data (Weibull, lognormal, exponential)

3: Check validity of experimental data

Prediction Model

4: Generation of a prediction model to predict reliability parameters for different use scenarios
Specification PLA reliability: ≥90% at 4500 hour

5: Calculate reliability parameters for different use scenarios

The prediction model predicts the material lifetime under the chosen operating conditions.

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