Response and failure analysis of a graphite-epoxy laminate containing terminating internal plies

Kemp, Brian L.; Johnson, Eric R.

doi:10.2514/6.1985-608

Cited by 33 publications

(25 citation statements)

References 6 publications

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“…4. Kemp and Johnson [2] have studied the distribution of interlaminar normal stress and shear stress for the laminate with nD 3. A comparison of the results has been presented elsewhere [3].…”

Section: Effect Of Dropping Plies At a Single Stationmentioning

confidence: 99%

Design guidelines for ply drop-off in laminated composite structures

Mukherjee

Varughese

2001

Composites Part B: Engineering

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Section: Effect Of Dropping Plies At a Single Stationmentioning

confidence: 99%

Design guidelines for ply drop-off in laminated composite structures

Mukherjee

Varughese

2001

Composites Part B: Engineering

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“…The results from the analysis have been compared with published results by Kemp and Johnson [2]. The dierence in results showed the need for re®nement of the mesh.…”

Section: Numerical Examplementioning

confidence: 83%

“…The present global±local approach for the analysis has been validated against published results of Kemp and Johnson [2]. For this purpose, the distributions of stress/strain have been studied at dierent locations of the laminate.…”

Section: Stress and Strain Distributionmentioning

confidence: 85%

“…The numerical examples considered have been investigated by Kemp and Johnson [2] for their study on ply drop-o. They carried out a linear elastic ®nite element analysis based on the generalised plane deformation [16] behaviour of laminates.…”

Section: Numerical Examplementioning

confidence: 99%

“…Most of the analytical studies are based on the ®nite element modelling of ply drop-o. Kemp and Johnson [2] reported a study to observe the interlaminar stress distribution and failure mechanism by a linear elastic ®nite element analysis. Fish and Lee [3] carried out an experimental investigation and 3-D ®nite element analysis to study the delamination initiation and its growth and found a good correlation.…”

Section: Introductionmentioning

confidence: 99%

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Development of a specialised finite element for the analysis of composite structures with ply drop-off

Mukherjee

Varughese

1999

Composite Structures

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High‐speed observation of dynamic delamination failure in tapered composite laminates under tensile loading

Bozkurt,

Ozen,

Yavuz

et al. 2024

Polymer Composites

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This article presents high‐fidelity observations of the time evolution of unstable delamination growth in tapered composite beams under tensile loading via ultra‐high‐speed camera in conjunction with digital image correlation. Asymmetrically tapered GFRP laminates, with a thickness drop from 18 plies to 12 plies, are manufactured in three different layup configurations with grouped drop‐offs: [06/(02)3/06], [06/06/06], and [06/(±45)3/06]. Beam specimens are subjected to quasi‐static tensile loading in a servo‐hydraulic axial testing machine, and the damage evolution on one edge of the tapered beam is monitored in situ at 124,000 fps with a high‐speed camera (HSC). In selected tests, digital image correlation (DIC) analyses are conducted either on the edge or on the tapered surface to obtain the full‐field strain and elucidate failure mechanisms. Real‐time HSC observations of the damage sequence consistently affirm that the initial failure mechanism is a transverse crack at the nearest drop‐off to the thin section, which is followed by delaminations at interfaces of sublaminates. Unstable delamination growth is characterized by measurements of lower bounds of crack tip speeds. The unique crack speed data provide evidence for the existing effect of through‐the‐thickness stresses on delamination growth. The detailed sequence and patterns of dynamic failure presented in this paper can serve as a benchmark to validate damage models used in simulations of tapered laminates.Highlights The sequence of unstable delamination growth in tapered GFRP beams is investigated experimentally. Characterized unstable delamination growth based on crack tip speed measurements. Strain fields are evaluated along beam edges using DIC in real‐time. In‐situ observations of dynamic failure can serve as a benchmark to validate damage models.

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Response and failure analysis of a graphite-epoxy laminate containing terminating internal plies

Cited by 33 publications

References 6 publications

Design guidelines for ply drop-off in laminated composite structures

Design guidelines for ply drop-off in laminated composite structures

Development of a specialised finite element for the analysis of composite structures with ply drop-off

High‐speed observation of dynamic delamination failure in tapered composite laminates under tensile loading

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