Buckling and postbuckling behavior of delaminated composite struts

Köllner, Anton; Völlmecke, Christina

doi:10.1080/15502287.2016.1276340

Cited by 10 publications

(8 citation statements)

References 22 publications

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“…The problem of a delaminated composite plate which is subjected to an inplane compressive load is extensively discussed within the literature (e.g. see [3,4,15,16,21,29]). Several studies (e.g.…”

Section: Application To a Delaminated Composite Strut/platementioning

confidence: 99%

An analytical framework to extend the general structural stability analysis by considering certain inelastic effects—theory and application to delaminated composites

Köllner

Völlmecke

2017

Composite Structures

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An analytical framework which incorporates damage propagation/growth into the general structural stability analysis is presented. Therefore, the conventional total potential energy approach is extended by introducing an extended total potential energy-like functional capable of describing inelastic processes in which equilibrium holds between available and the required force for producing a change in structure. The work deals with systems which are described by I generalized coordinates and K damage parameters. The damage parameters are found to be functions of I generalized coordinates and M load parameters. The underlying variational principle for inelastic solids may be solved using discrete formulations or approximate methods such as a Rayleigh-Ritz formulation. This leads to a set of non-linear algebraic equations, comprising post-critical equilibrium paths and damage propagation. In order to verify the framework, it is applied to the well-known problem in which a delaminated composite strut/plate is subjected to an in-plane compressive load.

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Section: Application To a Delaminated Composite Strut/platementioning

confidence: 99%

An analytical framework to extend the general structural stability analysis by considering certain inelastic effects—theory and application to delaminated composites

Köllner

Völlmecke

2017

Composite Structures

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“…In [20,21,22], the post-buckling behaviour considering propagating delaminations is described for a plate with clamped loading edges and free conditions on the remaining edges. Thus, the structural response is similar to a strut showing a weakly stable behaviour in the global buckling regime [17]. For these plates, delamination growth is associated with the onset of the global buckling response.…”

Section: Introductionmentioning

confidence: 81%

“…• the buckling and post-buckling behaviour for the case of non-growing delaminations (e.g. [12,17,24,25,34,35]) and • the calculation of the energy release rate along the delamination tip (e.g. [4,5,6,7,13,20,21,22]).…”

Section: Introductionmentioning

confidence: 99%

Post-buckling behaviour and delamination growth characteristics of delaminated composite plates

Köllner

Völlmecke

2018

Composite Structures

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The problem of a delaminated composite plate subjected to in-plane compressive loading is investigated by employing a novel analytical framework previously developed by the authors. The framework is capable of modelling the post-buckling behaviour considering damage growth by using a set of generalized coordinates only. Therefore, in order to model the post-buckling responses of delaminated composite plates a Rayleigh-Ritz formulation is employed. Thus, the post-buckling behaviour as well as the delamination growth characteristics are determined by solving a set of non-linear algebraic equations only. For the cases investigated, the study reveals that delamination growth is associated with the the global buckling response. So long as stable delamination growth is present, the post-buckling response remains also stable. However, unstable delamination growth may be caused which would occur unexpectedly yielding sudden failure of the structure. This underlines the importance of considering delamination growth when studying the structural stability behaviour of these structures.

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“…The local buckling increased for composites having symmetrical stacking sequence. Kollner and Vollmecke 16 studied the buckling and post buckling behavior of composites with single delamination. The mixed-mode buckling occurred at larger delamination lengths.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on flexural behaviour of delaminated carbon/epoxy composite using three dimensional digital image correlation

Kopparthi

Gemaraju

Pathakokila

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In semi automated manufacturing processes of multilayered carbon fiber reinforced composites, defects are induced. These defects cause reduction in service life of the products and lead to decrease in structural performance. In the present work, carbon fiber reinforced epoxy composite laminate with a stacking sequence of [0/0//45/−45/90/45/−45/90/90/−45/45/90/−45/45/0/0] was fabricated by hand lay-up method using vacuum bagging technique. An artificial defect to create pre-delamination was located in this composite between 0° and 45° plies at the centre of laminate. Experiments were conducted in four-point bending to determine the stiffness behavior of composite laminate and study other damage patterns occurred due to the existence of pre-delamination. The probable reasons for occurrence of other damage forms are explained in detail. Three-dimensional digital image correlation (DIC) technique was employed to determine displacements and strains of the specimen. The out of plane displacement due to local buckling against the bending load was also quantified.

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Buckling and postbuckling behavior of delaminated composite struts

Cited by 10 publications

References 22 publications

An analytical framework to extend the general structural stability analysis by considering certain inelastic effects—theory and application to delaminated composites

An analytical framework to extend the general structural stability analysis by considering certain inelastic effects—theory and application to delaminated composites

Post-buckling behaviour and delamination growth characteristics of delaminated composite plates

Experimental investigations on flexural behaviour of delaminated carbon/epoxy composite using three dimensional digital image correlation

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