Experimental behaviour of aeronautical notched carbon fibre reinforced thermoplastic panels under combined tension-shear-pressure loadings

Grotto, Florent; Castanié, Bruno; Serra, Joël

doi:10.1016/j.engfailanal.2023.107075

Cited by 7 publications

(35 citation statements)

References 47 publications

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“…The procedure described to estimate the fluxes from a surface measurement [ 4 ] can be carried out on this experiment to estimate the real fluxes passing through the sample. Figure 11 (right) shows the resulting moment field as obtained using derivatives of surface measurement with the classical laminate theory.…”

Section: Experimental Test Casesmentioning

confidence: 99%

“…First, unlike uniaxial coupon testing, it is most of the time impossible to accurately know what load is really going through the specimen given the displacement of the far acting actuators. Recent research [ 4 ] exhibits the fact that the force and moment flux distributions are very far from being homogeneous in space (Figure 1) or time. It is, however, necessary to describe accurately the repartition of the load fluxes in the specimen throughout testing and up to failure in order to output limit and ultimate force and moment fluxes to help the design process.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the flux determination, Grotto et al [ 4 ] exploited the surface displacements obtained from stereo digital image correlation (SDIC) and used the classical laminate theory (Figure 2) to compute the moment and force fluxes from top surface observations. This methodology was only valid for zones where there is no damage and was relatively time‐consuming.…”

Section: Introductionmentioning

confidence: 99%

“…Obtaining the force and moment fluxes from the upper surface displacement using the classical laminate theory. [ 4 ] …”

Section: Introductionmentioning

confidence: 99%

“…Indeed, with this certification method, thousands of tests are F I G U R E 1 Force and moment flux distribution for a shear + pressure test on a notched composite plate just before total failure; the rectangular arrays are the averaging zones used to output scalar values. [4] This test has been performed using a similar set-up as the one described later in Section 3.2.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring structural scale composite specimens in a post‐buckling regime: The integrated finite element stereo digital image correlation approach with geometrically non‐linear regularization

Dufour

Colantonio

Périé

et al. 2023

Strain

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Even though the simulations used to describe the failure of laminates are becoming more and more predictive, complex testing under multiaxial loadings is still required to validate the design of structural parts in a wide range of industrial domains. It is thus essential to assess the actual boundary conditions to allow for an objective comparison between testing and calculations, in particular since the structural tests are complex and often leads to buckling. Therefore, accurate estimation of force and moment fluxes applied to the specimen is critical. In this context, stereo digital image correlation (SDIC) has proven to be an important measurement tool and provides very well‐resolved surface displacement fields, but the exploitation of such measurements to calculate fluxes remains problematic when testing composites. The first objective of this study is both to reduce the uncertainty associated with fluxes determination on a complex test and to simplify the extraction process with respect to existing procedures. The second objective is to make this methodology robust to geometrically non‐linear deformations. In this paper, we propose a new methodology that extracts minimal boundary conditions in the form of 3D mechanically admissible displacements fields. The approach developed uses a finite element SDIC (FE‐SDIC) method regularized by means of mechanical behaviour admissibility equations. Results show that the new methodology outputs much more accurate fluxes than classical data generated from multiple differentiations of the displacement fields. Excellent noise robustness is obtained and quantified. Numerical predictions have been satisfactorily compared with experimental data from one structural‐scale composite specimen under complex testing.

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Section: Experimental Test Casesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Obtaining the force and moment fluxes from the upper surface displacement using the classical laminate theory. [ 4 ] …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%