Material Reliability Test of PLA Polymer Degradation

Reliability Test Approach

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

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

Hydrolysis reaction of PLA:

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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