Investigation of internal friction and fracture fatigue entropy of CFRP laminates with various stacking sequences subjected to fatigue loading

Huang, Jia; Li, Chen; Liu, Wencheng

doi:10.1016/j.tws.2020.106978

Cited by 40 publications

(20 citation statements)

References 40 publications

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“…Sato et al reported that the fracture entropy generation of TriA-X polyimide was ~15.5 kJ/m 3 K [11]. Entropy-based damage evaluation has been experimentally confirmed for metallic [12][13][14], polymeric [9], and composite materials [15][16][17][18]. In the following, we distinguish between thermal and mechanical entropies.…”

Section: Introductionmentioning

confidence: 90%

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

et al. 2022

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Entropy generation from a mechanical and thermal perspective are quantitatively compared via molecular dynamic (MD) simulations and mechanical and thermal experiments. The entropy generation values regarding mechanical tensile loading—which causes invisible damage—of the Polyamide 6 (PA6) material are discussed in this study. The entropy values measured mechanically and thermally in the MD simulation were similar. To verify this consistency, mechanical and thermal experiments for measuring entropy generation were conducted. The experimentally obtained mechanical entropy was slightly less than that calculated by MD simulation. The thermal capacity is estimated based on the specific heat capacity measured by differential scanning calorimetry (DSC), applying the assumed extrapolation methods. The estimated entropy generation was higher than the aforementioned values. There is a possibility that the entropy-estimating method used in this study was inappropriate, resulting in overestimations. In any case, it is verified that entropy increases with mechanical loading and material invisible damage can be qualitatively detected via thermal property measurements.

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Section: Introductionmentioning

confidence: 90%

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

et al. 2022

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“…Naderi et al 97 demonstrated that by summing the entropy production over its life cycle, one arrives at a material property known as fracture fatigue entropy (FFE). Recent developments have established FFE as a viable fatigue failure index for metallic and composite materials 98–100 because it is independent of geometry, load, and frequency. A simplified version of FFE can be determined from the following equation.…”

Section: Microstructure‐sensitive Studies Using Statistical Representationmentioning

confidence: 99%

General quantification of fatigue damage with provision for microstructure: A review

Jirandehi

Khonsari

2021

Fatigue Fract Eng Mat Struct

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Recent developments in microstructure‐sensitive computational modeling and experimental verification have provided significant insight on how one can estimate fatigue damage and predict useful life. As a myriad of methods and approaches are available, it is important to understand how to properly utilize them in a unified and efficient framework for the quantification of damage in safety‐critical components such as jet engine fan blades, gas turbine disks, and airframe structural connections. To this end, the microstructure‐sensitive studies considering crystal plasticity are reviewed, and methods for implementing the statistical representations of material microstructure are presented. Finally, a computational crystal plasticity approach utilizing the statistical representation of parameters and a new thermodynamically based framework is suggested.

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“…CFRP can be used in the moving structures such as airplanes and helicopters [ 1 ]. When it is used for components in the aircraft engine blades and fuselage, the fatigue behavior should be considered because both these components are subjected to fatigue cyclic loading [ 2 , 3 ]. Compared to metals, the fatigue process of composites is more complex.…”

Section: Introductionmentioning

confidence: 99%

Influence of Humidity on Fatigue Performance of CFRP: A Molecular Simulation

Chen

et al. 2020

Polymers

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The study on durability of carbon fiber reinforced plastics (CFRP) in complex environments is critical because of its wide applications. Herein, mechanical behavior of carbon fiber reinforced epoxy composites in the fatigue process were investigated under different humidity via molecular dynamics (MD) simulation method. Transversely isotropic atom based models were established to simulate the structure of CFRP at the atomistic level. Owing to the weak performance in vertical fiber direction, mechanical behavior in a 90° orientation was investigated. Mean stress and energy were both employed to describe the evolution of mechanical performance while mean squared displacement (MSD), radius of gyration (Rg), and free volume were performed to describe the evolution of structural change during the fatigue process. The results show that the humidity led to a weakened interfacial adhesive performance. Free volume became larger under cyclic load, which caused the water molecules to diffuse into the inside of epoxy resin. The distance between the matrix and fiber became larger in the dry system while it reduced because of the diffusion of water molecules in wet system. The rate of performance degradation decreased with the increase in humidity because of poor initial performance at high humidity.

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Investigation of internal friction and fracture fatigue entropy of CFRP laminates with various stacking sequences subjected to fatigue loading

Cited by 40 publications

References 40 publications

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material

General quantification of fatigue damage with provision for microstructure: A review

Influence of Humidity on Fatigue Performance of CFRP: A Molecular Simulation

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