Development of a finite element via Unified Formulation: Implementation as a User Element subroutine to predict stress profiles in composite plates

Ferreira, Gregório Felipe Oliveira; Almeida, José Humberto S.; Ribeiro, Marcelo Leite; Ferreira, António

doi:10.1016/j.tws.2020.107107

Cited by 14 publications

(10 citation statements)

References 30 publications

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“…If acceptable results during the experiments are achieved, than the FEM model for the current material is fed. Reproduction of Ferreira's (FERREIRA, 2014) results for implicit simulations in ABAQUS using UMAT and damage evolution are done to serve as basis for verification of the FEM model of the impact simulations to be performed with the employed material system. Provided with all of these, and taking care to follow the procedure for LEI analysis explained in Figure 62, drop-weight tests are performed in the CFRP laminates and these will serve for both computational model feeding and rail-tests in these damaged coupons.…”

Section: Proposed Methodology For Saimentioning

confidence: 99%

“…To fulfill these objectives, reproduction of the computational results done by Ferreira (FERREIRA, 2014) are firstly made. For quasi-static simulations an UMAT (User Material Subroutine -ABAQUS Standard) is used.…”

Section: Dissertation Goalsmentioning

confidence: 99%

“…However, in this case, firstly it will be needed a consistent prediction of the out-of-plane stresses (σ 33 , τ 13 and τ 23 ). Thus, a 3D analysis needs to be employed using solid finite elements or a quasi-3D strategy using finite elements based in Unified Formulations (CALIRI JUNIOR; TITA; FERREIRA, 2016; CALIRI JUNIOR; FERREIRA; TITA, 2016; CALIRI JUNIOR; FERREIRA; TITA, 2017; CALIRI JUNIOR, RIBEIRO et al, 2018;FERREIRA et al, 2020).…”

Section: Computational Approachmentioning

confidence: 99%

“…A test campaign for material characterization following the adequate standards was performed. According to Ferreira (FERREIRA, 2014), the Digital Image Correlation (DIC) technique can substitute other displacement data acquiring methods to measure the strain state in the specimens during the tests. In his work, a comparison with DIC and strain gages data is performed and little deviation is observed between them.…”

Section: Monotonic Quasi-static Materials Characterization Testsmentioning

confidence: 99%

“…Firstly, since there is any compression test apparatus at the GEA facilities the related parameters obtained via these tests used in this work for the material model computational application are the same as those obtained by Ferreira (FERREIRA, 2014), since it was studied a very similar material in comparison with the one investigated through the present text. Thus, using the procedure described in Figure 23, the obtained parameters are listed in Table 11.…”

Section: Cyclic Quasi-static Tests and Materials Model Parameters Identificationmentioning

confidence: 99%

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Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal

Souza¹

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Fiber-reinforced polymer (FRP) laminated composite materials represents the greatest revolution since the development of the jet turbine in aeronautical industry. Possessing high stiffness and strength to weight ratio, they encounter increasingly space in high-performance applications, particularly in aircrafts. However, nowadays there are limitations in their usage attached to the complexity of prediction of behavior that these materials presents under impact loadings, which can result in a significant reduction in their mechanical properties. Moreover, due to its heterogeneity and anisotropy, the description of initiation and propagation of damage and failure mechanisms are not fully understood yet. Thus, the application of composite materials in aeronautical structures still follow conservative design philosophies. In this context, it is strategic the study of the mechanical behavior and the failure development and evolution presented by these materials. Following this, the post-failure behavior comprehension, in the sense of prediction of its residual strength, it is of major relevance to use damage tolerant design philosophies when designing one structure. So, this work presents a experimental approach, computationally aided, to evaluate the shear-after (low-velocity) impact behavior of FRP composites with unidirectional (UD) reinforcement since this is a poorly explored theme by the existent literature. Based on Continuum Damage Mechanics (CDM), a material model present in the literature is employed to investigate computationally the failure and post-failure of these materials under impact an shear-after-impact loadings. Thus, experimental tests in [0 • ] 16 specimens are conducted in a 3-rail and drop-weight tests apparatus to obtain the stress-strain curves results for laminates with and without damage. Based in these, a phenomenological damage metric for shear-after-impact is proposed to aid the obtaining of the residual strength of these materials. Computational simulations are realized aiming to obtain, using the finite element method, the tendencies experimentally observed and to evaluate the potentialities and limitations of the material model employed. It is concluded at the end of this work that the proposed methodology is promising to obtain a complementary to the already consolidated approaches of compression-and flexure-after-impact.

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Section: Proposed Methodology For Saimentioning

confidence: 99%

Section: Dissertation Goalsmentioning

confidence: 99%

Section: Computational Approachmentioning

confidence: 99%

Section: Monotonic Quasi-static Materials Characterization Testsmentioning

confidence: 99%

Section: Cyclic Quasi-static Tests and Materials Model Parameters Identificationmentioning

confidence: 99%

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