In-Situ Characterization of Polymer Matrix Composites and Progressive Damage Analysis of Virtually Reconstructed Microstructures

Shah, Sagar; Plaka, Evgenia; Schey, Mathew; Hu, Jie; Liu, Fuqiang; Beke, Tibor; Stapleton, Scott E.; Maiarù, Marianna

doi:10.12783/asc35/34906

Cited by 4 publications

(2 citation statements)

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“…During this process, cure-induced volumetric shrinkage of the matrix, mismatch in the thermo-mechanical properties between the fibers and the matrix, and thermal gradients due to exothermic reactions lead to significant residual stress generation and, at times, damage accumulation [ 5 ]. Random and off-axial fiber architecture, introduced during manufacturing, alters the composite stress state which may further contribute to the onset and evolution of damage [ 6 , 7 , 8 , 9 , 10 ]. Internal defects such as voids and microcracks may also occur [ 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Manufacturing on the Transverse Response of Polymer Matrix Composites

Shah

Maiarù

2021

Polymers

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The effect of residual stress build-up on the transverse properties of thermoset composites is studied through direct and inverse process modeling approaches. Progressive damage analysis is implemented to characterize composite stiffness and strength of cured composites microstructures. A size effect study is proposed to define the appropriate dimensions of Representative Volume Elements (RVEs). A comparison between periodic (PBCs) and flat (FBCs) boundary conditions during curing is performed on converged RVEs to establish computationally efficient methodologies. Transverse properties are analyzed as a function of the fiber packing through the nearest fiber distance statistical descriptor. A reasonable mechanical equivalence is achieved for RVEs consisting of 40 fibers. It has been found that process-induced residual stresses and fiber packing significantly contribute to the scatter in composites transverse strength. Variation of ±5% in average strength and 18% in standard deviation are observed with respect to ideally cured RVEs that neglect residual stresses. It is established that process modeling is needed to optimize the residual stress state and improve composite performance.

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Section: Introductionmentioning

confidence: 99%

Effect of Manufacturing on the Transverse Response of Polymer Matrix Composites

Shah

Maiarù

2021

Polymers

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“…Studies on the pore structure of coalbed reservoirs have focused on the analysis of microstructure characteristics, establishment of pore quantitative evaluation methods, and determination of the water absorption and production mechanisms of coalbed methane; these studies provide a theoretical foundation for research on the permeability damage of coal seams with nanopores [8][9][10][11][12][13]. Their results showed that coal pores are mostly nanoscale pores and vulnerable to reservoir damage caused by external fluid pollution [14,15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs

Zhai

Chen

et al. 2021

Geofluids

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The plugging of nanopores in low-permeability coal reservoirs is an important factor that affects productivity reduction. However, the mechanism of plugging of the nanopores in coal reservoirs remains unclear. In this study, the coal samples from the Anze coalbed methane block of the North China Oilfield are used as the research object. Experiments are conducted on the mechanism of nanopore plugging by the variation of nanopore permeability based on the pressure oscillation method and the nanopore (scanning electron microscope) method. The research shows that the foreign working fluid invades a coal sample; the sample changes from being hydrophobic to being water absorbent within a certain period. The instability caused by the expansion of coal clay mineral particles promotes the dispersion and shedding of particles, and the migration of particles is accelerated under the shear stress of the working fluid. In addition, the viscosity and pressure difference of the working fluid are important factors that affect particle plugging. The viscosity of the fluid increased by two times, and permeability decreased by 1.21 times. As the pressure difference increases by two times, permeability can be reduced by up to two orders of magnitude. The findings of this study can help for better understanding of the mechanism of plugging of the nanopores in coal reservoirs and the reasons of production reduction in low-permeability coal reservoirs. Such findings provide theoretical support for the selection of the working fluid, and reasonable production pressure difference can effectively reduce the damage on coal permeability in a low-permeability coal reservoir.

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Analytical Model for Composite Transverse Strength based on Computational Micromechanics

Shah

Maiarù

2023

Int J Mult Comp Eng

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The transverse strength of fiber-reinforced composites is a matrix-dominated property whose accurate prediction is crucial to designing and optimizing efficient, lightweight structures. State-of-the-art analytical models for composite strength predictions do not account for fiber distribution, orientation, and curing-induced residual stress that greatly influence damage initiation and failure propagation at the microscale. This work presents a novel methodology to develop an analytical solution for transverse composite strength based on computational micromechanics that enables the modeling of stress concentration due to representative volume elements (RVE) morphology and residual stress. Finite element simulations are used to model statistical samples of composite microstructures, generate stress-strain curves, and correlate statistical descriptors of the microscale to stress concentration factors to predict transverse strength as a function of fiber volume fraction. Tensile tests of thin plies validated this approach for carbon- and glass-reinforced composites showing promise to obtain a generalized analytical model for transverse composite strength prediction.

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In-Situ Characterization of Polymer Matrix Composites and Progressive Damage Analysis of Virtually Reconstructed Microstructures

Cited by 4 publications

References 0 publications

Effect of Manufacturing on the Transverse Response of Polymer Matrix Composites

Effect of Manufacturing on the Transverse Response of Polymer Matrix Composites

Influence of Migration and Plugging of Nanoparticles on Coal Permeability in Coal Reservoirs

Analytical Model for Composite Transverse Strength based on Computational Micromechanics

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