Assessment of open hole flexural strength and progressive damage mechanism of CFRP composite as a function of stacking sequence

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A comparative analysis has been done on CFRP laminate to understand the design aspect of cutouts under tensile and flexural loading. Detailed analysis of strength, modulus, and variance in failure mechanism has been done to assess the relationship between material strength and design under two different loading conditions. Longitudinal and cross ply stacking sequences are considered. Tensile loading is found to be more detrimental than flexural loading for composite laminate with hole. SEM and optical micrographs have been analyzed to perceive the failure mechanisms of laminates under two different loading conditions. Mode I dominated delamination and mode II dominated delamination are found to be prevalent in OHT (open hole tensile) and OHF (open hole flexural) failure, respectively.

Section: Methodsmentioning

confidence: 99%

Section: Flexural Loadingmentioning

confidence: 99%

Section: Flexural Loadingmentioning

confidence: 99%

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An analysis on tensile and flexural loading response for unidirectionalCFRPlaminate with cutout/hole: Geometrical design effect on the material strength

Gupta

Pal

Ray

2022

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“…They observed failure of

{([], 45 / 30)}_{s}

laminate near support whereas matrix damage in

{([], 0 / 90)}_{s}

and

{([], 30 / 45)}_{s}

at hole vicinity 80 . Gupta et al have experimentally studied the flexural behavior of CFRP composite laminate with introduction of open hole as well as by varying stacking sequences 81 . They noticed that the hole sensitivity towards flexural strength is the same for longitudinal and crossply laminates.…”

Section: Assessment Of Mechanical Performance Of Composite Component ...mentioning

confidence: 99%

“…Both the mechanism observed in experimental and simulation methods are in good agreement. To perceive damage progression mechanism of CFRP laminate as a function of stacking sequence under flexural loading SEM analyses have been done by Gupta and coworkers 81 . They noticed that the damage starts from the hole edge on either of the two sides (tensile or compression surface depending on the stacking sequence) and moves through the thickness followed by interlaminar shear delamination and final failure.…”

Section: Failure Of Composite Component Containing Holementioning

confidence: 99%

An overview of mechanical properties and failure mechanism of FRP laminates with hole/cutout

Gupta

Pal

Ray

2023

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Aerospace and aircraft companies follow a pyramidal structure of testing, ranging from specimen tests to full-scale structure tests, for aircraft structural design. At the base level, open hole strength evaluation is one of the qualification procedures for composite components. The holes are made in the structural components to accommodate bolts and rivets in order to assemble the parts into a single unit. Holes in the component are also used to fulfill functional requirements, such as the passage of wire bundles. FRP components are sensitive to these holes/cutouts as substantial decrement in the strength is observed in several experiments. The degradation in the strength of the component is due to stress concentration around the hole. This review aims to comprehend the effect of the hole on the mechanical properties of FRP laminates; the emphasis is mainly on CFRP laminates and experimental results. An overview of tensile, compressive, flexural and post buckling properties of laminates with the hole is presented to aid in the optimal design of the component. Finally, the failure mechanism during loading is discussed and described through a graphical presentation.

An assessment of mechanical behavior of glass fiber/epoxy composites with secondary short carbon fiber reinforcements

Dasari

Lohani

Prusty

2021

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Utilizing recycled or short fibers for making useful engineering composite component is a present research trend and requirement. Current research work explicates the effect of short carbon fibers (SCF) used as secondary reinforcement in woven glass/epoxy hybrid composites and evaluates their mechanical properties. Different concentrations (0.1, 0.3, and 0.5 wt%) of SCF were incorporated to assess the tensile, flexural, and interlaminar fracture toughness (Mode I and II) of the resulted composites. Composites with 0.1 wt% SCF showed 29.02% and 16.08% increment in the tensile and flexural strength, respectively. For Mode I and Mode II interlaminar fracture toughness tests, 0.1 wt% SCF‐GE samples showed the highest strain energy release rate. Double cantilever beam specimens were used for Mode I testing and an improvement of 13.49% in GIC value was observed. End‐notched flexure method was used for the Mode II tests, and 0.1 wt% SCF‐GE samples showed 20.45% increase in GIIC values. This paper explains the various reasons and mechanisms for obtaining such results. Scanning electron microscopy of the fractured surfaces was carried out to perceive the diverse failure micro‐mechanisms that could have been involved.