Damage accumulation in quasi-isotropic graphite/epoxy laminates under constant-amplitude fatigue and block loading

Bartley-Cho, Jonathan D.; Lim, Seung Gyu; Hahn, H. T.; Shyprykevich, P.

doi:10.1016/s0266-3538(97)00214-5

Cited by 54 publications

(28 citation statements)

References 7 publications

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“…It is of interest to note that, load sequence effects on the fatigue life of composites have been investigated by several authors [30][31][32][33][34][35][36][37]. Many studies have shown that a high-low sequence (DB type) lead to a lower fatigue life compared to a low-high (IB type) sequence [30].…”

Section: Variable Amplitude Fatigue Behaviormentioning

confidence: 99%

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Improved variable-amplitude fatigue behavior of a glass-fiber-reinforced hybrid-toughened epoxy composite

Manjunatha¹,

Jagannathan²,

Padmalatha³

et al. 2011

Journal of Reinforced Plastics and Composites

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A thermosetting epoxy polymer was hybrid-modified by the addition of 9 wt.% of rubber microparticles and 10 wt.% of silica nano-particles. Glass-fiber reinforced plastic (GFRP) composite laminates employing the unmodified epoxy matrix (GFRP-neat), and the hybrid epoxy matrix (GFRP-hybrid), were produced by a resin infusion technique. The experimental fatigue lives of both GFRP composites under three different variable amplitude load sequences, namely (i) a three-step increasing block, (ii) a three-step decreasing block and, (iii) a random block load sequence derived from a three-step load block, were determined. The fatigue life of the GFRPhybrid composite was higher than that of the GFRP-neat composite under all the three load sequence blocks investigated, by about x2.6 to x4.0 times. The saturated matrix crack density and the stiffness reduction rate were both lower in the GFRP-hybrid composite compared to the GFRP-neat composite material. The suppressed matrix cracking and reduced delamination growth rates measured in the hybrid-modified epoxy matrix enhanced the fatigue life of the corresponding GFRP-hybrid composite. Using the constant amplitude fatigue data generated at various stress ratios, the fatigue lives under these variable amplitude load sequence blocks were predicted using empirical models. The predicted fatigue lives, although non-conservative, were in reasonably agreement with the experimental results.

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Section: Variable Amplitude Fatigue Behaviormentioning

confidence: 99%

“…Many studies have shown that a high-low sequence (DB type) lead to a lower fatigue life compared to a low-high (IB type) sequence [30]. In contrast, other investigations have revealed the opposite trend [31,32,36]. Further, several studies have also suggested that no load sequence effects exist in composites [33,34].…”

Section: Variable Amplitude Fatigue Behaviormentioning

confidence: 99%

Improved variable-amplitude fatigue behavior of a glass-fiber-reinforced hybrid-toughened epoxy composite

Manjunatha¹,

Jagannathan²,

Padmalatha³

et al. 2011

Journal of Reinforced Plastics and Composites

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“…an open question for the integrity analysis of composites to predict the fatigue damage and long-term behavior of a laminate subjected to specified load and environment conditions (temperature, moisture, etc.) [33][34][35][36][37][38][39][40][41][42][43][44][45][46]. Specifically, temperature is a very important factor which influences fatigue behavior of composite materials.…”

Section: Discussionmentioning

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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“…[30][31][32], where [32] measures the crack density indirectly by measuring the stiffness degradation. The key finding of the VA block loading study is that the crack density in GFRP is a suitable damage measurement variable for defining load-history dependent effects for a low-high sequence of VA block loading.…”

Section: Crack Density Evolution and Stiffness Degradationmentioning

confidence: 99%

“…The only available study on this matter for GFRP is the recent publication in [33] that investigated prepreg, whereas [31] reports crack density evolution for quasi-isotropic CFRP laminates subjected to different load ratios. The results published in [33] does not include off-axis crack density evolution results, but only number of cycles to first crack initiation and subsequent crack growth rates.…”

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confidence: 99%

Fatigue damage evolution in GFRP laminates with constrained off-axis plies

Glud¹,

Dulieu-Barton²,

Thomsen³

et al. 2017

Composites Part A: Applied Science and Manufacturing

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., "Fatigue damage evolution in GFRP laminates with constrained off-axis plies", Composites Part A, http://dx.doi. org/10.1016/j.compositesa.2017. method with a data mining approach and applying these to large data sets obtained during fatigue tests. It is shown that for a constant stress level, the stochastic nature of off-axis crack initiation and crack growth is accurately modelled by the Weibull distribution, with the distribution parameters being efficiently derived using the developed approach. The data-rich characterisation provides new insight in the crack density evolution process for VA and C-T loading, as well as derived Weibull distribution parameters in combination with the classical S-N curves and Paris' Law relationship.Hence, providing an improved approach that includes the stochastic and deterministic information for physically based modelling of crack density evolution for fatigue loading.Glud, J.A., Dulieu-Barton, J.M., Thomsen, O.T. and Overgaard, L.C.T., "Fatigue damage evolution in GFRP laminates with constrained off-axis plies", Composites Part A, http://dx

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Damage accumulation in quasi-isotropic graphite/epoxy laminates under constant-amplitude fatigue and block loading

Cited by 54 publications

References 7 publications

Improved variable-amplitude fatigue behavior of a glass-fiber-reinforced hybrid-toughened epoxy composite

Improved variable-amplitude fatigue behavior of a glass-fiber-reinforced hybrid-toughened epoxy composite

Constitutive Behavior and Damage Characterization of High Temperature Polymer Composites

Fatigue damage evolution in GFRP laminates with constrained off-axis plies

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