Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops

Panin, S. V.; Bogdanov, Alexey A.; Еремин, А. В.; Buslovich, D. G.; Alexenko, V. O.

doi:10.3390/ma15134656

Cited by 16 publications

(7 citation statements)

References 38 publications

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“…To determine its value, the ratio between the energy loss over the total strain energy in a cycle was determined. The relative damping value was obtained by dividing Equation (8) by Equation (7) to get 26 :

Ψ = \frac{E_{d}}{E_{p}} (100 %)

…”

Section: Methodsmentioning

confidence: 99%

Conversion of low density polyethylene foams into auxetic metamaterials

Chen

Hamdi

Rodrigue

2022

Polymers for Advanced Techs

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Cellular polymers, such as polyethylene foams, are commonly used in the packaging industry. These materials have short service life and generate a high volume of waste after use. In order to valorize this waste and produce added‐value applications, it is proposed to convert these materials into highly efficient energy absorption structures. This was done by modifying the original cellular morphology of the foams (spheroidal or polygonal) into a re‐entrant structure to produce auxetic materials. This work presents an optimized process combining mechanical compression and solvent vapor evaporation‐condensation leading to low density foams (77–200 kg/m3) having negative Poisson's ratios (NPR). Three series of recycled low density polyethylene (LDPE) foams with an initial density of 16, 21, and 36 kg/m3 were used to optimize the processing conditions in terms of treatment temperature, time, and pressure. From all the samples prepared, a minimum Poisson's ratio of −3.5 was obtained. To further characterize the samples, the final foam structure was analyzed to relate with mechanical properties and compare with conventional foams having positive Poisson's ratios. The results are discussed using tensile properties and energy dissipation which were shown to be highly improved for auxetic foams. Overall, the resulting foams can be used in several applications such as sport and military protection equipment.

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Ψ = \frac{E_{d}}{E_{p}} (100 %)

…”

Section: Methodsmentioning

confidence: 99%

Conversion of low density polyethylene foams into auxetic metamaterials

Chen

Hamdi

Rodrigue

2022

Polymers for Advanced Techs

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“…In contrast, loops with increasing area were found for these composites tested in alternative mode. Thus, hysteresis loop area is an important parameter that makes it possible to study both linear and nonlinear behaviors of the particulate composites, as well as to assess their damage degree under cyclic loading [51,52].…”

Section: Discussionmentioning

confidence: 99%

An Automated Optical Strain Measurement System for Estimating Polymer Degradation under Fatigue Testing

Bogdanov

Panin

Lyubutin

et al. 2022

Sensors

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(1) Background: this study deals with design of an automated laboratory facility based on a servo-hydraulic testing machine for estimating parameters of mechanical hysteresis loops by means of the digital image correlation (DIC) method. (2) Methods: the paper presents a description of the testing facility, describes the grounds for calculating the elastic modulus, the offset yield strength (OYS) and the parameters of the mechanical hysteresis loops by the DIC method. (3) Results: the developed hardware-software facility was tested by studying the fatigue process in neat polyimide (PI) under various amplitude tension-tension loadings. It was found that the damage accumulation was accompanied by the decrease in the loop areas, while failure occurred when it reduced by at least ~5 kJ/m3. (4) Conclusions: it was shown that lowering the loop area along with changing the secant modulus value makes it possible to estimate the level of the scattered damage accumulation (mainly at the stresses above the OYS level). It was revealed that fractography data, namely the pattern and sizes of the fatigue crack initiation and propagation zones, did not correlate well with the dependences of the parameters of the hysteresis loops.

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“…During each cycle, the material stores elastic energy and then dissipates this energy as heat during the subsequent relaxation. The damping factor represents the ratio between the dissipated energy to the strain energy stored in the material as [ 44,46 ]

\Psi \textrm{ } = \frac{E_{\text{d}}}{E_{\text{p}}} \left(\right. 100 \% \left.\right)

…”

Section: Methodsmentioning

confidence: 99%

Polybutylene Succinate Auxetic Membrane Produced by Solution Electrospinning

Ahmadi Bonakdar,

Chen,

Sarbanha

et al. 2023

Adv Eng Mater

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Herein, a simple and cost‐effective method (solution electrospinning) is used to produce auxetic biobased polybutylene succinate membranes. The effect of fiber morphology, orientation, and alignment is investigated on the mechanical properties of the resulting membranes with a focus on Poisson's ratio. The degree of orientation is controlled by increasing the speed of the collector (from 4.03 to 11.01 m s−1) during membrane fabrication. The results indicate that membranes with oriented fibers show a more auxetic behavior than those with randomly orientated fibers. In particular, samples with a high level of alignment and tested in the transverse direction present higher negative Poisson's ratios (down to −5.73) compared to samples tested in the parallel direction (Poisson's ratios down to −2.90). However, samples tested in the transverse direction show lower tensile properties with higher dissipated energy and damping factor. Therefore, the level of fiber orientation and the number of fibers in the transverse and parallel directions are the most important parameters controlling the mechanical properties of electrospun membranes.

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Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops

Cited by 16 publications

References 38 publications

Conversion of low density polyethylene foams into auxetic metamaterials

Conversion of low density polyethylene foams into auxetic metamaterials

An Automated Optical Strain Measurement System for Estimating Polymer Degradation under Fatigue Testing

Polybutylene Succinate Auxetic Membrane Produced by Solution Electrospinning

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