Stochastic micromechanical damage modeling of progressive fiber breakage for longitudinal fiber-reinforced composites

Ju, J. W.; Wu, Yufeng

doi:10.1177/1056789515576863

Cited by 26 publications

(27 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initial values of df and dm are both 0, which means no damage occurs in the composite initially. The fiber breakage in composite material is a progressive process according to the research of Ju and Wu (2016) and Wu and Ju (2017). In our model the failure of fiber is simplified: once fiber failure occurs the value of df is set as 0.99 directly.…”

Section: Damage Modelmentioning

confidence: 99%

A micromechanics-based damage model for compressive behavior analysis of impacted composite laminates

Lou

Han

Cai

2019

International Journal of Damage Mechanics

View full text Add to dashboard Cite

The compressive strength of composite laminates decreases seriously after being subjected to impact loading, which is an important item to be considered in the usage of composite material. In this paper, a micromechanics-based damage model is proposed to study the compressive behavior of impacted composite laminates. The micro stresses of fiber and matrix are calculated by stress amplification factors and then used to judge the failure mechanisms according to corresponding physical failure criteria. A progressive damage model based on different failure statuses of constituents is established to study the degradation of material properties. The bi-linear cohesive model is used in the research of delamination onset and propagation. The compressive behaviors of quasi-isotropic composite laminates subjected to different impact energies are investigated by this proposed method. Good agreements in terms of structure responses, failure mechanisms, and residual compressive strengths are obtained between numerical results and experimental data. The matrix cracking and delamination caused by impact loading are responsible for the initiation and propagation of buckling, which leads to the final collapse of entire laminates. Based on the numerical investigations of material parameters, the increment of mode II interlaminar fracture toughness is capable of improving the residual compressive strength significantly.

show abstract

Section: Damage Modelmentioning

confidence: 99%

A micromechanics-based damage model for compressive behavior analysis of impacted composite laminates

Lou

Han

Cai

2019

International Journal of Damage Mechanics

View full text Add to dashboard Cite

show abstract

“…The elasticity tensors of the matrix phase and the fiber phase are C 0 and C 1 , respectively. The effect of fiber breakage is quantified by an eigenstrain (Ju and Wu, 2016). Therefore, the corresponding Eshelby's equivalent equation can be derived as…”

Section: Micromechanics and Damage Mechanics Of Mmcs With Fiber Breakagementioning

confidence: 99%

“…where e 0 is the perturbed strain due to the presence of the fiber phase, e Ã is the conventional eigenstrain field accounting for the mismatch between the matrix and the fiber, and e Ã cr is the eigenstrain proposed by Ju and Wu (2016) to mimic the effect of fiber breakage. The eigenstrain e Ã cr together with e Ã constitutes the total eigenstrain e ÃÃ .…”

Section: Micromechanics and Damage Mechanics Of Mmcs With Fiber Breakagementioning

confidence: 99%

Elastoplastic damage micromechanics for continuous fiber-reinforced ductile matrix composites with progressive fiber breakage

2016

International Journal of Damage Mechanics

Self Cite

View full text Add to dashboard Cite

An elastoplastic damage micromechanical framework considering evolutionary fiber breakage is proposed to predict the overall material behaviors of continuous fiber-reinforced composites with ductile matrix under external loading. In the present work, we assume that the overall nonlinear behavior of a composite is primarily attributed to the plastic deformation in the matrix as well as the damage evolution due to fiber breakage. The effective elastoplastic deformations are governed by means of the effective yield surface derived from a representative microstructure with elastic fibers embedded in an elastoplastic matrix material. The matrix behaves elastically or plastically depending on the local stress, and the effective elastoplastic deformation obeys the associative plastic flow rule and isotropic hardening law. In addition, taking advantage of the eigenstrain due to fiber breakage together with a Weibull statistic model, the evolutionary fiber breakage mechanism is effectively predicted. Finally, the overall elastoplastic stressstrain responses are reached under the framework of micromechanics and damage mechanics. Comparisons between the proposed theoretical predictions and experimental data are performed to illustrate the capability of the proposed framework. In particular, the proposed model is employed to investigate the overall uniaxial and axisymmetric elastoplastic stress-strain responses of the continuous fiber-reinforced metal matrix composites. Studies of the initial yield surfaces at various damage levels are conducted as well.

show abstract

“…When loading stress reaches a certain value, the fibers inside GFRP bars can break, escalating the effect of corrosive environment that destroys the interface between the resin and fibers. The load causes plastic deformation in the matrix, which tends to lower the rate of fiber-breakage evolution in the form of energy dissipation [16,17]. To test the effect of the environment and stress on the mechanical properties of GFRP bars, Nkurunziza et al [18] put GFRP bars in distilled water in an accelerated experiment with a certain stress level.…”

Section: Introductionmentioning

confidence: 99%

Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution

et al. 2020

View full text Add to dashboard Cite

Mechanical properties of glass fiber reinforced polymer (GFRP) composites degrade under the combined effects of mechanical load and alkaline solution, affecting the service ability and safety of GFRP reinforced structures. In this study, GFRP bars were loaded with cyclic tension at different stress levels and immersed in alkaline solution for days to investigate the tensile properties and degradation law of GFRP bars. The degradation mechanisms were studied at micro-, meso- and macro-scales with scanning electron microscopy (SEM) and three-dimensional X-ray microscopy, respectively. The results show that tensile strength and degradation rate of GFRP bars are mainly dependent on the different stress levels and alkaline solution. When stress level is higher, the tensile strength degrades more quickly, especially in the early stages of soaking. With the loading and immersion time, the elastic modulus and Poisson’s ratio increase at first and then decrease. The ultimate tensile strain is relatively stable, whereas the ultimate elongation is significantly reduced. A strength-degradation model was proposed and fit well with experimental data, demonstrating that the model can be applied to predict tensile strength degradation under combined effects of the load and alkaline solution.

show abstract

Stochastic micromechanical damage modeling of progressive fiber breakage for longitudinal fiber-reinforced composites

Cited by 26 publications

References 42 publications

A micromechanics-based damage model for compressive behavior analysis of impacted composite laminates

A micromechanics-based damage model for compressive behavior analysis of impacted composite laminates

Elastoplastic damage micromechanics for continuous fiber-reinforced ductile matrix composites with progressive fiber breakage

Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution

Contact Info

Product

Resources

About