Global-local Assessment of Low-velocity Impact Damage in Woven Composites

Pearson, James; Zikry, M. A.; Prabhugoud, Mohanraj; Peters, Kara

doi:10.1177/0021998307078734

Cited by 24 publications

(30 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hosur et al [7,8] and Siow and Shim [9] studied behavior of various types of composite laminates under low velocity impact and compared their results with ultrasonic c-scans of the damaged laminates. Pearson et al [10] did global-local assessment of woven composites, where global measurements were taken from low-velocity impact experiments and local strain measurements were 2 Advances in Mechanical Engineering (a) Basket weave pattern of E-Glass/epoxy composite laminate [24] (b) FE mesh of E-Glass/epoxy composite laminate obtained using optical Fiber Bragg Grating (FBG) sensors and mapped the failure for two-and three-dimensional woven composites. Many researchers proposed analytical models for progressive damage in fiber-reinforced composite laminates.…”

Section: Introductionmentioning

confidence: 99%

On the Behavior of Fiberglass Epoxy Composites under Low Velocity Impact Loading

Chandekar

Thatte

Kelkar

2010

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Response of fiberglass epoxy composite laminates under low velocity impact loading is investigated using LS-DYNA , and the results are compared with experimental analysis performed using an instrumented impact test setup (Instron dynatup 8250). The composite laminates are manufactured using H-VARTM c process with basket weave E-Glass fabrics. Epon 862 is used as a resin system and Epicure-W as a hardening agent. Composite laminates, with 10 layers of fiberglass fabrics, are modeled using 3D solid elements in a mosaic fashion to represent basket weave pattern. Mechanical properties are calculated by using classical micromechanical theory and assigned to the elements using ORTHOTROPIC ELASTIC material model. The damage occurred since increasing impact energy is incorporated using ADVANCED COMPOSITE DAMAGE material model in LS-DYNA . Good agreements are obtained with the failure damage results in LS-DYNA and experimental results. Main considerations for comparison are given to the impact load carrying capacity and the amount of impact energy absorbed by the laminates.

show abstract

Section: Introductionmentioning

confidence: 99%

On the Behavior of Fiberglass Epoxy Composites under Low Velocity Impact Loading

Chandekar

Thatte

Kelkar

2010

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…Delamination can significantly reduce composite structure stiffness, but it can be arrested by cross-stitching through the layers of a laminate (Pearson et al 2007). In composite laminates with unidirectional plies, the delaminated area tends to be oblong, or "peanut" shaped, and oriented in the direction of the lower ply (Abrate 1998).…”

Section: Background Informationmentioning

confidence: 99%

Low velocity impact damage assessment in IM7/977-3 cross-ply composites using 3D computed tomography

Demerath¹

View full text Add to dashboard Cite

Low-velocity impact damage in IM7/977-3 carbon fiber reinforced polymer (CFRP) composites was investigated using 3D computed tomography (CT). 32-ply IM7/977-3 symmetric cross-ply composites were impacted at different impact energy levels and with different impactors (DELRIN® resin flat-ended cylindrical and tool steel hemispherical strikers) using an Instron 8200 Dynatup drop-weight impact machine. The impact energies were chosen to produce slightly visible damage, characterized by short cracks on the impacted surface and little delamination on the non-impacted surface (29.27 J), and barely visible damage, characterized by indentation on the impacted surface but no visible delamination on the back surface of the specimens (20.77 J). Internal damage was assessed using the Zeiss METROTOM 1500 industrial CT scanning system, and CT images were reconstructed using VGStudio MAX and the MyVGL 2.2 viewer. To determine the extent of the damage zone, impacted 152.4 mm square composite plates were initially scanned. As the relatively large specimen size did not allow for evaluation of internal cracks and isolation of delamination at ply interfaces, smaller specimens that enclosed the damaged region (45 mm square plates) were cut out and imaged. The CT scan results showed that volume of the impact damage zone had a generally positive correlation with impact energy, maximum load, and maximum deflection, but that the relationship was generally weak. Absence of a definite correlation between damage volume and impact energy was unexpected, as the difference in the impact energy was up to 30%.

show abstract

“…(16) and chaotic ultrasonic waves (17) . • Peters and Zikry at North Carolina State University are studying intelligent multi-scale sensing for damage identification and mitigation in woven composite for aerospace structural applications (18) . • Kudu at University of Arizona is studying the modelling of ultrasonic and terahertz radiation in defective tiles for condition monitoring of thermal protection systems (19) .…”

Section: Uncertainty Analysis and Stochastic Prognosis For Structuralmentioning

confidence: 99%

Flight structures fundamental research trends and directions

Giurgiutiu¹

2009

Aeronaut. j.

View full text Add to dashboard Cite

The paper presents an overview of the fundamental research performed in the US in the field of flight structures under the sponsorship of the Air Force Office of Scientific Research (AFOSR). After presenting a general overview of AFOSR, the paper focuses on the structural mechanics program. Three large applications areas are considered: (a) future flight structures; (b) structural sustainment; (c) structural dynamics and vibration control. These three broad areas are covered at various levels of complexity and detail. Currently supported topics are presented and major funding and results are discussed. The paper ends with summary and conclusions.

show abstract

Global-local Assessment of Low-velocity Impact Damage in Woven Composites

Cited by 24 publications

References 29 publications

On the Behavior of Fiberglass Epoxy Composites under Low Velocity Impact Loading

On the Behavior of Fiberglass Epoxy Composites under Low Velocity Impact Loading

Low velocity impact damage assessment in IM7/977-3 cross-ply composites using 3D computed tomography

Flight structures fundamental research trends and directions

Contact Info

Product

Resources

About