Fracture behavior of carbon fiber reinforced polymer composites: An optical study of loading rate effects

Miao, Chengyun; Tippur, Hareesh V.

doi:10.1016/j.engfracmech.2018.12.035

Cited by 19 publications

(10 citation statements)

References 33 publications

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Section: Comparison With Quasi-static Fracture Behaviormentioning

confidence: 88%

“…Thus, a comprehensive fracture performance assessment of CNP, however, should include evaluation of both static and dynamic fracture characteristics. In fact, it is well-known that fracture of polymer-based composites with fibrous constituents such as the conventional fiber reinforced polymer composites (D. Lee et al, 2010;C. Miao & Tippur, 2019) and CNF hydrogel composites (Yang et al, 2019) are strain rate dependent.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic crack initiation and growth in cellulose nanopaper

Miao

Zhang

et al. 2021

Cellulose

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Cellulose nanopaper (CNP) made of cellulose nanofibrils (CNF) has gained extensive attention in recent years for its lightweight and superior mechanical properties alongside sustainable and green attributes. The mechanical characterization studies on CNP at the moment have generally been limited to tension tests. In fact, thus far there has not been any report on crack initiation and growth behavior, especially under dynamic loading conditions. In this work, crack initiation and growth in self-assembled CNP, made from filtration of CNF suspension, are studied using a full-field optical method. Dynamic crack initiation and growth behaviors and time-resolved fracture parameters are quantified using Digital Image Correlation (DIC) technique. The challenge associated with dynamic loading of a thin strip of CNP has been overcome by an acrylic holder with a wide pre-cut slot bridged by edge-cracked CNP. The ultrahigh-speed digital photography is implemented to map in-plane deformations during pre-and post-crack initiation regimes including dynamic crack growth. Under stress wave loading conditions, macroscale crack growth occurs at surprisingly high-speed (600-700 m/s) in this microscopically fibrous material. The measured displacement fields from dynamic loading conditions are analyzed to extract stress intensity factors (SIF) and energy release rate (G) histories. The results show that the SIF at crack initiation is in the range of 6-7 MPa(m) 1/2 , far superior to many engineering plastics. Furthermore, the measured values increase during crack propagation under both low-and high-strain rates, demonstrating superior fracture resistance of CNP valuable for many structural applications.

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Section: Comparison With Quasi-static Fracture Behaviormentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Dynamic crack initiation and growth in cellulose nanopaper

Miao

Zhang

et al. 2021

Cellulose

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“…Knowing the crack length at each load level, plots of G vs. a (crack length), or the so-called crack growth resistance curve, was obtained and is shown in evident in conventional composites. (That is, the behavior is contrary to fiber reinforced composites which often show lower fracture toughness under dynamic loading conditions relative to the quasi-static counterparts (C. Miao & Tippur, 2019) in matrix dominant orientations.) Furthermore, the crack initiation toughness of F-CNP is significantly higher than tough engineering polymers such as polycarbonate, for which the reported fracture toughness is in the range 3-4 MPa m 1/2 with a significantly lower elastic modulus of ~2.5 GPa under quasi-static conditions and ~2.0 MPa m 1/2 under dynamic conditions (Sundaram & Tippur, 2017).…”

Section: Comparison With Quasi-static Fracture Behaviormentioning

confidence: 88%

Dynamic Crack Initiation And Growth In Cellulose Nanopaper

Miao

Zhang

et al. 2021

Preprint

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Cellulose nanopaper (CNP) made of cellulose nanofibrils (CNF) has gained extensive attention in recent years for its lightweight and superior mechanical properties alongside sustainable and green attributes. The mechanical characterization studies on CNP at the moment have generally been limited to tension tests. In fact, thus far there has not been any report on crack initiation and growth behavior, especially under dynamic loading conditions. In this work, crack initiation and growth in self-assembled CNP, made from filtration of CNF suspension, are studied using a full-field optical method. Dynamic crack initiation and growth behaviors and time-resolved fracture parameters are quantified using Digital Image Correlation (DIC) technique. The challenge associated with dynamic loading of a thin strip of CNP has been overcome by an acrylic holder with a wide pre-cut slot bridged by edge-cracked CNP. The ultrahigh-speed digital photography is implemented to map in-plane deformations during pre- and post-crack initiation regimes including dynamic crack growth. Under stress wave loading conditions, macroscale crack growth occurs at surprisingly high-speed (600-700 m/s) in this microscopically fibrous material. The measured displacement fields from dynamic loading conditions are analyzed to extract stress intensity factors (SIF) and energy release rate (G) histories. The results show that the SIF at crack initiation is in the range of 6-7 MPa(m)1/2, far superior to many engineering plastics. Furthermore, the measured values increase during crack propagation under both low- and high-strain rates, demonstrating superior fracture resistance of CNP valuable for many structural applications.

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“…The time‐dependence behavior has been reported regardless of length of the spatial or temporal aspects of the composite. [ 14–25 ]…”

Section: Introductionmentioning

confidence: 99%

“…The time-dependence behavior has been reported regardless of length of the spatial or temporal aspects of the composite. [14][15][16][17][18][19][20][21][22][23][24][25] While advanced composite structures have recently relied on carbon and graphite fibers to achieve extreme strength and stiffness at a lower weight penalty, glass fibers remain a reliable competitor despite being the oldest high-performance fiber since the 1930s. [26] For example, fiberglass-based composites are notorious in the marine industry, such as in the construction of yachts, as well as in the defense industry, having been used in certain parts of fourth-generation fighter jets.…”

Section: Introductionmentioning

confidence: 99%

Creep analysis of E‐glass/vinyl‐ester laminated composites for underground vault structures

Youssef

2020

Polymer Composites

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Creep is eminent in fiber reinforced polymer matrix composite materials given the susceptibility of polymers to constant loading. The response of polymer matrix composites used in retrofitting vital infrastructure to long‐term flexural loadings is investigated to elucidate the effect of creep. The experimental approach consisted of first establishing a benchmark of the quasi‐statically tested flexural properties. A fresh set of samples were then flexural tested for an extended period. Failure was determined to be strain‐driven in both quasi‐static and long‐term testing conditions. The mechanical properties were found to be insensitive to the strain rate (in the low strain regime), while being mildly sensitive to creep loading. The flexural response also showed dependence on the historic creep loading. The creep strain was successfully fitted into Baily‐Norton power law, which allowed for forecasting the creep life based on the critical strain failure criteria. The overall results explicate the interrelation between long‐term loading and fidelity of composites‐based infrastructures.

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Fracture behavior of carbon fiber reinforced polymer composites: An optical study of loading rate effects

Cited by 19 publications

References 33 publications

Dynamic crack initiation and growth in cellulose nanopaper

Dynamic crack initiation and growth in cellulose nanopaper

Dynamic Crack Initiation And Growth In Cellulose Nanopaper

Creep analysis of E‐glass/vinyl‐ester laminated composites for underground vault structures

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