Effect of hygrothermal environment on the tension–tension fatigue performance and reliable fatigue life of T700/MTM46 composite laminates

Ma, Binlin; Feng, Yu; He, Yuting; Zhang, Teng; Zhang, Sheng; Zhang, Tianyu

doi:10.1631/jzus.a1900081

Cited by 14 publications

(7 citation statements)

References 41 publications

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“…Herein, ε 0 , B , and T were 5%, 0.5%, and 1000 fs, respectively. Mean stress [ 13 ] is widely used to describe the performance of the composites and can be defined as follows:

where σ min and σ max are the minimum stress and maximum stress per cycle. Some researchers have predicted the long-term performance using short-term performance with a certain function.…”

Section: Resultsmentioning

confidence: 99%

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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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“…Herein, ε 0 , B , and T were 5%, 0.5%, and 1000 fs, respectively. Mean stress [ 13 ] is widely used to describe the performance of the composites and can be defined as follows:

where σ min and σ max are the minimum stress and maximum stress per cycle. Some researchers have predicted the long-term performance using short-term performance with a certain function.…”

Section: Resultsmentioning

confidence: 99%

“…Ma et al [ 13 ] investigated the effect of hygrothermal environment on tension-tension fatigue performance and reliable life of CFRP. Their results show that the degree of damage of the saturated specimens is especially, is more severe than that of the virgin specimens.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2020

Polymers

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“…This is confirmed by numerous existing investigations. [ 38–45 ] Jean‐St‐Laurent et al [ 38 ] investigated the effect of temperature during impact on the CAI behavior of carbon/epoxy composite sandwich panels. Elamin [ 40 ] experimentally conducted the low velocity impact and CAI tests across temperature from −70 to 23°C.…”

Section: Introductionmentioning

confidence: 99%

“…This is confirmed by numerous existing investigations. [38][39][40][41][42][43][44][45] Jean-St-Laurent et al [38] investigated the effect of temperature during impact on the CAI behavior of carbon/epoxy composite sandwich panels. Elamin [40] experimentally conducted the low velocity impact and CAI tests across temperature from À70 to 23 C. The results showed that the higher compressive strength for non-impacted specimens at low temperature, however, upon impact, severe damage, and complex failure modes at low temperature lead to significant reduction in CAI strength by 60%.…”

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confidence: 99%

Experimental and numerical investigation on compression after impact behavior of hygrothermal aged CFRP laminates

Huang

Xie

et al. 2022

Polymer Composites

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In the paper, a detailed experimental and numerical investigation of compression after impact (CAI) behavior of hygrothermal aged T300 985LV carbon/ epoxy composites is presented. Rectangular fabric laminates are damaged by low-velocity impact, and moisture absorption conditioning is carried out. The moisture absorption curves agree with Fick's law, with a moisture equilibrium rate of 0.84% at 1392 h. Then, CAI experiments are carried out on moisture saturated specimens at different temperatures. The effects of hygrothermal environments on CAI strength are obtained with an interpretation of corresponding mechanism. Furthermore, finite element analysis based on hygrothermal mechanics formulation and incremental Newton-Raphson mixed iteration equation is established. The numerical results are in good agreement with the experimental ones, with an accuracy of up to 92%, which demonstrates the effectiveness of the established numerical model. The results show that the CAI strength of 85 RH% hygroscopic saturated laminates is decreased by approximately 12% at 85 C and 17% at 128 C. Additionally, the allowable compression value of 3546 μϵ is obtained for T300 985LV composite laminates, which is useful for applications in civil aircraft design. K E Y W O R D Scompression after impact, finite element analysis, hygrothermal aged, impact damage, moisture absorption | INTRODUCTIONCarbon fiber reinforced plastic (CFRP) is widely used in aerospace, marine and other engineering industries. [1,2] Compared with conventional materials, CFRP is characterized by the advantages of high specific strength, high specific stiffness, and excellent fatigue characteristics. [3][4][5][6][7] The percentage of CFRP used in civil aircraft ranges from 25% for the A380 to 50% for the later B787, which indicates that the usage of composite is increasing in primary components for aircraft structures. [8] Since the environment that the composite structure is exposed to significantly affect its performance, it must be accounted for during design. The most important aspect of the CFRP is temperature and moisture (hygrothermal), [9][10][11][12] which are crucial for understanding these effects and considering them in composite design. In addition, the impact damage is another factor that significantly affects composite properties. The impacts (i.e., tool drop, runway gravel, and hail) cause through-thickness stress waves in

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“…In recent years, the relationship between the strength and fatigue properties of fiber-reinforced composites has been attracting the attention of many material scientists. For example, B.-L.MA et al [ 6 ] studied the effects of humid and hot environments on the fatigue reliability life of carbon-fiber composite laminates. The results show that the change trend in the stiffness degradation curve of the test specimens was consistent: as the reduction in stiffness increases, the fatigue limit decreases by about 6%.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Fatigue Resistance of Notched Long Fiber-Reinforced Composite Materials

Cao

Niu³

et al. 2022

Polymers

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A new type of specimen is proposed for further research on the structure of glass-fiber-reinforced resin matrix composite lamina, which holds the potential to significantly improve the fatigue property of materials while having limited effect on the tensile strength. Herein, the fatigue life, based on the monotonic tensile test, was simulated utilizing ANSYS and nCode analysis software. The results show that the tensile strength of the local notched fiber specimens is slightly lower than that of the continuous long-fiber specimens. However, when extending the notches’ longitudinal distance, the impact to tensile strength becomes smaller and smaller. The results show that, when the longitudinal distance of the notched fiber is greater than 80 mm, the reduction in tensile strength is less than 0.65%. At the same time, the fatigue property of the specimens is improved considerably. It has been found in this experiment that when the notches’ longitudinal distance is 100 mm, the notches’ length is 1.5 mm, and the notches’ width is 1.75 mm, the fatigue cycles number of the specimens reaches 126,000 cycles, which is about 180% higher than that of the 0-0 type long fiber specimens without notches. This investigation provides a robust foundation and is a compelling basis for further exploration of new fatigue specimens.

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Effect of hygrothermal environment on the tension–tension fatigue performance and reliable fatigue life of T700/MTM46 composite laminates

Cited by 14 publications

References 41 publications

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

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

Experimental and numerical investigation on compression after impact behavior of hygrothermal aged CFRP laminates

An Investigation on Fatigue Resistance of Notched Long Fiber-Reinforced Composite Materials

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