Investigation and Modeling of Damage Growth in Composite Laminates.

Reifsnider, K.L.; Stinchcomb, WW; Bakis, Charles E.; Yih, H R; Shalev, Doron

doi:10.21236/ada207623

Cited by 3 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fig. 26, a large, immeasurable fringe order was observed in the region directly on top of a stepwise 0° ply fracture (indicated by an arrow in the figure) [31]. We therefore conclude that not only is there a strain concentration in the intact 0° fibers ahead of the crack tip, but also at least a portion of the laminate underlying the surface damage zone near the notch is subjected to a strong strain concentration, as a result of the local reduction in compliance caused by the 0° ply fiber fractures.…”

Section: Localization Processmentioning

confidence: 92%

“…The photoelastic coating data (figs. 37 (Plate) and 38) indicate that high shear strain concentrations form at the 0° tangential crack tips, and also that the regions above and below the notch (between the 0° tangential cracks) have become somewhat decoupled from the remainder of the laminate and carry little load [31,32]. Our interpretation of this information is that the stress distribution in the (0, 45, 0, -45)s4 laminate becomes increasingly uniform as fatigue damage develops [provided no localized surface damage events occur, as in fig.…”

Section: Localization Processmentioning

confidence: 99%

“…31 (Plate) and 32)[31,32]. Fatigue damage in the (0, 45, 90, -45) s4 laminate follows the path of the migrating zones of high strain concentration.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Fatigue Behavior of Composite Laminates

Stinchcomb¹,

Bakis²

1991

Composite Materials Series

View full text Add to dashboard Cite

Section: Localization Processmentioning

confidence: 92%

Section: Localization Processmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue Behavior of Composite Laminates

Stinchcomb¹,

Bakis²

1991

Composite Materials Series

View full text Add to dashboard Cite

“…A rational mechanistic approach can be used to predict a stable pattern of cracks in the off-axis plies prior to laminate failure [17]. This characteristic damage state (CDS) could be used to define the stress and state of strength prior to laminate failure.…”

Section: Introductionmentioning

confidence: 99%

“…This characteristic damage state (CDS) could be used to define the stress and state of strength prior to laminate failure. Recent observations [17] strongly suggest that the CDS could be independent of load history and that the CDS is a laminate property. In summary, the philosophy of CDS is best stated by Reifsnider and Masters [17], "From the standpoint of mechanics, the CDS has the same significance as the single crack for homogeneous materials in the sense that it is the well-defined damaged physical state from which the fracture event develops.…”

Section: Introductionmentioning

confidence: 99%

Effects of Moisture, Residual Thermal Curing Stresses, and Mechanical Load on the Damage Development in Quasi-Isotropic Laminates

Kriz

Stinchcomb

1982

Damage in Composite Materials: Basic Mechanisms, Accumulation, Tolerance, and Characterization

View full text Add to dashboard Cite

This investigation demonstrates how moisture absorbed in [0/±45/90]s and [0/90/±45]s graphite epoxy laminates significantly alters the stress state and chronology of damage development along the laminate edge during static tension and tension-tension cyclic loading. Emphasis is placed on using reasonable approximations for wet and dry elastic properties, including out-of-plane properties (v23 and G23), since these properties are required by finite element and shear lag models to predict the stress state at the laminate edge. Moisture was observed to alter the dry edge stress state in the 90-deg plies of the [0/±45/90]s laminate such that delaminations occurred at a lower load and transverse cracks occurred at a higher load. A model was developed which predicted the differences in loads required to initiate damage in the 90-deg plies of the two laminates in the wet and dry conditions. Although moisture can alter the chronology of damage development, the damage state in each laminate observed prior to fracture appeared to be independent of moisture content.

show abstract

Improving the performance of bolted joints in composite structures using metal inserts

Mara

Haghani

Al‐Emrani

2016

Journal of Composite Materials

View full text Add to dashboard Cite

As the use of fibre reinforced polymer materials in bridge construction is becoming more popular, appropriate joining techniques, particularly for field joints, are necessary. Bolted joints are a common method for joining fibre reinforced polymer structures. The main advantage of bolted joints is their detachability, but they have a number of shortcomings. On the one hand, hole clearances, which are needed to facilitate on-site assembly, reduce the stiffness and joint efficiency. On the other hand, it is not possible to rely on the beneficial effects of bolt pre-defined tension loads, i.e. load transfer in friction, due to the considerable losses of bolt tension caused by the creep deformation in the composite material. To tackle these problems, a solution utilising metallic inserts in the hole is proposed in this paper. A series of experimental tests have been conducted to investigate the effect of inserts on the bolt-tension relaxation, the stiffness and the load-bearing behaviour of joints. Finite element analyses were also employed. The study demonstrates several benefits of the inserts: the bolt tension relaxation is minimised, the load transfer by friction may be feasible to be utilised in the bridge service state and the joint efficiency is increased in terms of stiffness and strength.

show abstract

Investigation and Modeling of Damage Growth in Composite Laminates.

Cited by 3 publications

References 15 publications

Fatigue Behavior of Composite Laminates

Fatigue Behavior of Composite Laminates

Effects of Moisture, Residual Thermal Curing Stresses, and Mechanical Load on the Damage Development in Quasi-Isotropic Laminates

Improving the performance of bolted joints in composite structures using metal inserts

Contact Info

Product

Resources

About