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A J Comer - One of the best experts on this subject based on the ideXlab platform.

  • analysis of failure modes for a non crimp basalt fiber reinforced epoxy composite under flexural and interlaminar shear loading
    Composite Structures, 2020
    Co-Authors: Indraneel R Chowdhury, Niamh H Nash, Alexandre Portela, N P Odowd, A J Comer
    Abstract:

    Abstract This study investigates the mechanical properties (interlaminar shear and flexural strength) and failure modes of a basalt/epoxy composite, manufactured using a non-crimp-fabric (NCF) with a vacuum assisted resin infusion process. Under flexural bending, damage initiated on the compression side between 20 and 50% of peak load and progressed from ply to ply with increasing load. Failure at the Tension Surface of the flexural bending specimen was confined to the bottom ply and was evident only close to final failure. Fiber kinking was the dominant failure mechanism on the compression side whereas fiber breakage was the dominant mechanism on the Tension side. Regarding interlaminar shear, interlaminar shear cracks initiated once samples were subjected to stress levels above 50% of peak stress and grew until failure with the crack following the fibre matrix interface of 90° tows. Overall, comparing with values available in the open literature, the NCF basalt/epoxy composite outperformed plain-woven basalt/epoxy and plain-woven E-glass/epoxy composites in terms of both flexural and interlaminar shear strength but demonstrated lower strength than NCF E-glass/epoxy composite.

Indraneel R Chowdhury - One of the best experts on this subject based on the ideXlab platform.

  • analysis of failure modes for a non crimp basalt fiber reinforced epoxy composite under flexural and interlaminar shear loading
    Composite Structures, 2020
    Co-Authors: Indraneel R Chowdhury, Niamh H Nash, Alexandre Portela, N P Odowd, A J Comer
    Abstract:

    Abstract This study investigates the mechanical properties (interlaminar shear and flexural strength) and failure modes of a basalt/epoxy composite, manufactured using a non-crimp-fabric (NCF) with a vacuum assisted resin infusion process. Under flexural bending, damage initiated on the compression side between 20 and 50% of peak load and progressed from ply to ply with increasing load. Failure at the Tension Surface of the flexural bending specimen was confined to the bottom ply and was evident only close to final failure. Fiber kinking was the dominant failure mechanism on the compression side whereas fiber breakage was the dominant mechanism on the Tension side. Regarding interlaminar shear, interlaminar shear cracks initiated once samples were subjected to stress levels above 50% of peak stress and grew until failure with the crack following the fibre matrix interface of 90° tows. Overall, comparing with values available in the open literature, the NCF basalt/epoxy composite outperformed plain-woven basalt/epoxy and plain-woven E-glass/epoxy composites in terms of both flexural and interlaminar shear strength but demonstrated lower strength than NCF E-glass/epoxy composite.

D D L Chung - One of the best experts on this subject based on the ideXlab platform.

  • analytical model of piezoresistivity for strain sensing in carbon fiber polymer matrix structural composite under flexure
    Carbon, 2007
    Co-Authors: D D L Chung
    Abstract:

    An analytical model is provided for the piezoresistive phenomenon of continuous carbon fiber polymer–matrix composite under flexure. This phenomenon allows strain sensing and entails reversible increase of the Tension Surface resistance and reversible decrease of the compression Surface resistance during flexure. The model considers the Surface resistance change to be due to change in the degree of current penetration. The longitudinal strain resulting from the flexure affects the through-thickness resistivity (which relates to the contact resistivity of the interlaminar interface). Good agreement is found between the model and prior experimental results, except that the calculated Surface resistance on the Tension side is higher than the measured value, when the magnitude of the average longitudinal strain on the Surface exceeds 3 · 10 � 3 .

  • self sensing of flexural strain and damage in carbon fiber polymer matrix composite by electrical resistance measurement
    Carbon, 2006
    Co-Authors: Shoukai Wang, D D L Chung
    Abstract:

    The self-sensing of flexural strain and damage has been demonstrated in carbon fiber polymer-matrix composite by measuring the DC electrical resistance. Upon strain in the elastic regime, the compression Surface resistance decreases reversibly (due to increase in the current penetration), while the Tension Surface resistance increases reversibly (due to decrease in the current penetration), and the oblique resistance increases reversibly. Upon minor damage, (i) the oblique resistance after unloading decreases, (ii) the oblique resistance decreases during load increase near the start of loading, and (iii) the curve of the oblique resistance or the resistance of the Tension or compression Surface vs. deflection becomes nonlinear. Upon major damage, all resistances abruptly and irreversibly increase, such that the onset occurs earlier for the compression Surface resistance and the oblique resistance than the Tension Surface resistance. The Surface resistances are superior indicators of strain, whereas the oblique resistance is a superior indicator of damage.

  • self sensing of flexural damage and strain in carbon fiber reinforced cement and effect of embedded steel reinforcing bars
    Carbon, 2006
    Co-Authors: Sihai Wen, D D L Chung
    Abstract:

    Self-sensing of flexural damage and strain in carbon fiber reinforced cement is attained by measuring the volume or Surface resistance with the four-probe method and electrical contacts on the compression and/or Tension Surfaces. The oblique resistance (volume resistance in a direction between the longitudinal and through-thickness directions) increases upon loading and is a good indicator of damage and strain in combination. The Surface resistance on the compression side decreases upon loading and is a good indicator of strain. The Surface resistance on the Tension side increases upon loading and is a good indicator of damage. The effectiveness for the self-sensing of flexural strain in carbon fiber reinforced cement is enhanced by the presence of embedded steel rebars on the Tension side. For the same midspan deflection, the fractional change in Surface electrical resistance is increased in magnitude, whether the Surface resistance is that of the Tension side or the compression side. The fractional change in resistance of the Tension Surface is increased by 40%, while the magnitude of the fractional change in resistance of the compression Surface is increased by 70%, due to the steel.

N P Odowd - One of the best experts on this subject based on the ideXlab platform.

  • analysis of failure modes for a non crimp basalt fiber reinforced epoxy composite under flexural and interlaminar shear loading
    Composite Structures, 2020
    Co-Authors: Indraneel R Chowdhury, Niamh H Nash, Alexandre Portela, N P Odowd, A J Comer
    Abstract:

    Abstract This study investigates the mechanical properties (interlaminar shear and flexural strength) and failure modes of a basalt/epoxy composite, manufactured using a non-crimp-fabric (NCF) with a vacuum assisted resin infusion process. Under flexural bending, damage initiated on the compression side between 20 and 50% of peak load and progressed from ply to ply with increasing load. Failure at the Tension Surface of the flexural bending specimen was confined to the bottom ply and was evident only close to final failure. Fiber kinking was the dominant failure mechanism on the compression side whereas fiber breakage was the dominant mechanism on the Tension side. Regarding interlaminar shear, interlaminar shear cracks initiated once samples were subjected to stress levels above 50% of peak stress and grew until failure with the crack following the fibre matrix interface of 90° tows. Overall, comparing with values available in the open literature, the NCF basalt/epoxy composite outperformed plain-woven basalt/epoxy and plain-woven E-glass/epoxy composites in terms of both flexural and interlaminar shear strength but demonstrated lower strength than NCF E-glass/epoxy composite.

Alexandre Portela - One of the best experts on this subject based on the ideXlab platform.

  • analysis of failure modes for a non crimp basalt fiber reinforced epoxy composite under flexural and interlaminar shear loading
    Composite Structures, 2020
    Co-Authors: Indraneel R Chowdhury, Niamh H Nash, Alexandre Portela, N P Odowd, A J Comer
    Abstract:

    Abstract This study investigates the mechanical properties (interlaminar shear and flexural strength) and failure modes of a basalt/epoxy composite, manufactured using a non-crimp-fabric (NCF) with a vacuum assisted resin infusion process. Under flexural bending, damage initiated on the compression side between 20 and 50% of peak load and progressed from ply to ply with increasing load. Failure at the Tension Surface of the flexural bending specimen was confined to the bottom ply and was evident only close to final failure. Fiber kinking was the dominant failure mechanism on the compression side whereas fiber breakage was the dominant mechanism on the Tension side. Regarding interlaminar shear, interlaminar shear cracks initiated once samples were subjected to stress levels above 50% of peak stress and grew until failure with the crack following the fibre matrix interface of 90° tows. Overall, comparing with values available in the open literature, the NCF basalt/epoxy composite outperformed plain-woven basalt/epoxy and plain-woven E-glass/epoxy composites in terms of both flexural and interlaminar shear strength but demonstrated lower strength than NCF E-glass/epoxy composite.