Morteza Kianifar , Mohammad Azadi , Fatemeh Heidari
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Abstract
This study presents the effect of immersion in Simulated Body Fluid (SBF) on the fatigue behavior of Polylactic Acid (PLA) and PLA-wood composites. For the degraded fatigue tests, the testing specimens were 28 days submersed in 10X SBF, weighed, and then fatigue experiments were done. The immersed samples gained weight due to water absorption. Additionally, mineral deposits grew on their external shells. The results indicate that PLA-wood composites exhibit a superior fatigue lifespan compared to pure PLA. The immersion in SBF notably decreased the fatigue lifespan of both PLA and PLA-wood composites. The scanning electron microscopy analysis revealed that pure PLA samples display brittle fracture characteristics. At the same time, PLA-wood composites showed signs of less brittle behavior compared to PLA, including micro-void formation and wood particle debonding.
期刊介绍：
Typical subjects discussed in International Journal of Fatigue address:
Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements)
Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading
Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions
Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions)
Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects
Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue
Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation)
Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering
Smart materials and structures that can sense and mitigate fatigue degradation
Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.
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