Probabilistic Failure Strength Analyses of Graphite/Epoxy Cross-Ply Laminates

Fukunaga, H.; Chou, Tsu-Wei; Peters, P.W.M.; Schulte, Karl

doi:10.1177/002199838401800403

Cited by 145 publications

(37 citation statements)

References 7 publications

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“…They presented a stochastic simulation model for the growth of multiple matrix cracks in cross-ply laminates subjected to both static and fatigue loads. Fukunaga et al [5] combined the shear-lag analysis with stochastic analyses to study progressive matrix cracking in carbon fibre cross-ply laminates.…”

Section: Delamination In Laminates: Effect Of Microstructurementioning

confidence: 99%

Simulations of delamination in CFRP laminates: Effect of microstructural randomness

Khokhar¹,

Ashcroft²,

Silberschmidt³

2009

Computational Materials Science

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Due to their high specific strength and stiffness, fibre-reinforced composite materials are being increasingly used in structural applications where a high level of performance is important (e.g. aerospace, automotive, offshore structures, etc.). Performance in service of these composites is affected by multi-mechanism damage evolution under loading and environmental conditions. For instance, carbon fibre-reinforced laminates demonstrate a wide spectrum of failure mechanisms such as matrix cracking and delamination. These damage mechanisms can result in significant deterioration of the residual stiffness and load-bearing capacity of composite components and should be thoroughly investigated.The delamination failure mechanism is studied in this paper for a double cantilever beam (DCB) loaded in Mode I. Several sensitivity studies are performed to analyse the effects of mesh density and of parameters of the cohesive law on the character of damage propagation in laminates. The microstructural randomness of laminates that is responsible for non-uniform distributions of stresses in them even under uniform loading conditions is accounted for in the model. The random properties are introduced with the use of Weibull's two-parameter probability density function. Several statistical realisations are carried out which show that the effect of microstructure could significantly affect the macroscopic response emphasizing the need to account for 2 microstructural randomness for accurate predictions of load-carrying capacity of laminate composite structures.

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Section: Delamination In Laminates: Effect Of Microstructurementioning

confidence: 99%

Simulations of delamination in CFRP laminates: Effect of microstructural randomness

Khokhar¹,

Ashcroft²,

Silberschmidt³

2009

Computational Materials Science

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“…The theoretical approaches are based on the shear lag model [2,[8][9][10][11], the principle of minimum complementary energy [12][13][14][15], and finite element method (FEM) calculations [16][17][18]. In the present paper, only standard glass fiber/epoxy GF/EP and carbon fiber/epoxy CF/EP C30/922 data will be discussed.…”

Section: Introductionmentioning

confidence: 99%

“…The functions fl and f2 are different for various transverse cracking models, which result in different predictions of stresses in plies, the crack opening displacement, and the modulus reduction. We will analyze the assumptions of different models and the corresponding expressions for fl and f2-Shear lag models [2,[8][9][10][11]. The models based on the shear lag assumption are the simplest.…”

Section: Introductionmentioning

confidence: 99%

Transverse cracks in cross-ply laminates. 1. Stress analysis

Krasņikovs

Vārna

1997

Mech Compos Mater

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“…The most probable value of crack density at a stress value of <7 2x = F 2t is the value corresponding to the average of the two values given by eqs. (20) and (21).…”

Section: Transverse Cracking -Deterministic Modelmentioning

confidence: 99%

Constitutive Behavior and Damage Characterization of High Temperature Polymer Composites

Daniel¹,

Luo²,

Sun³

2001

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REPORT DOCUMENTATION PAGEPublic reporting burden for this collection of information is estimated to average 1 hour per response, including the fimerfor reviewinj dS needed and completinq and reviewing this collection of information. Send comments regarding this burden estimate or any ott 4302 Respondents should be aware that notwithstanding any other provfeion of law no person shall be subject to any penalty for f, valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. _ AFRL-SR-BL-TR-01-igthe ucing 02-jrrently REPORT DATE (DD-MM-YYYY) 31-08-2001 REPORT TYPE Final TITLE AND SUBTITLE Constitutive Behavior and Damage Characterization of High Temperature Polymer Composites AUTHOR(S)Isaac M. Daniel, Jyi-Jiin Luo and Zuo Sun PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Northwestern University Evanston, EL 60208 DATES COVERED (From -To)Oct. 15.199715. -April 14,2001 5a. CONTRACT NUMBER 5b. GRANT NUMBER F49620-98-1-0056 5c. PROGRAM ELEMENT NUMBER 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Office of Scientific Research (AFOSR) Arlington, VA 22203-1977 PERFORMING ORGANIZATION REPORT NUMBERC416-4 . t . , , The objective of this investigation was to characterize the constitutive behavior, physical aging, damage mechanisms and damage development in high temperature polymer matrix composites under various environmental and loading conditions. The aging induced volumetric shrinkage was measured and a model was proposed capable of predicting aging under any temperature history. In the case of monotonically loaded laminates a unique and simple general relationship was developed between applied load and crack density independent of lamination geometry and temperature and accounting for statistical variability. Under fatigue conditions a master curve was developed relating damage (crack density) and fatigue cycles, independent of layup and temperature. It is related to and affected by physical aging of the polymeric matrix, viscoelastic deformation (creep) and hygrothermomechanical degradation. It is therefore important to investigate the processes involved and any accelerated test methodologies that will yield valid predictions of long term behavior. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENT Distribution unlimited SUPPLEMENTARY NOTES ABSTRACTt ,The objective of this investigation is to characterize the constitutive behavior, damage mechanisms and damage development in high temperature polymer matrix composites and develop models for long term behavior under various environmental and loading conditions. The approach followed is as follows:1. Select candidate polymer composite materials. 2.Characterize unidirectional lamina. 3.Perform aging and viscoelastic characterization under isothermal and nonisothermal conditions. 4.Study static and fatigue behavior of laminae and laminates at various cyclic stress amplitudes and temperature levels. 5.Study failure mode...

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Probabilistic Failure Strength Analyses of Graphite/Epoxy Cross-Ply Laminates

Cited by 145 publications

References 7 publications

Simulations of delamination in CFRP laminates: Effect of microstructural randomness

Simulations of delamination in CFRP laminates: Effect of microstructural randomness

Transverse cracks in cross-ply laminates. 1. Stress analysis

Constitutive Behavior and Damage Characterization of High Temperature Polymer Composites

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