Progressive damage analysis of green composite laminates subjected to in-plane crashworthiness

Abstract

In this paper the initiation and propagation of delamination in thin-walled green composite structures were studied. In particular, laminates of flax and hemp fibers with epoxy resin were investigated from experimental and numerical points of view, using the finite element code LS-DYNA. First, an experimental campaign was conducted using DCB and 4ENF tests to obtain the values of the interlaminar fracture modes, required for the cohesive fracture modeling. In addition, in-plane crashworthiness tests were performed on composite plates to analyze the damage of the specimens, under both quasi-static and dynamic conditions. A trigger mechanism was considered to help delamination to start and to ensure the most progressive crushing possible. The predominant damage mode was splaying, but some ply fragmentation in the middle layers and some buckling phenomena were also observed. In general, more stable progressive crushing was observed under dynamic conditions than under quasi-static ones, even if a reduction in terms of absorbed energy was obtained by moving to the dynamic condition. The numerical predictions showed a good agreement with the experimental reference results, validating the current framework for crashworthiness analysis of green composite structures.

Keywords

Green composites natural fibers delamination crashworthiness finite element numerical modeling

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References

Topics for Environment. European Commission. https://environment.ec.europa.eu/topics_en.

Road transport: Reducing CO2 emissions from vehicles. https://climate.ec.europa.eu/eu-action/transport_en.

Stewart

Automotive composites offer lighter solutions. Reinforced Plastics 2010; 54, 22–28. DOI: 10.1016/S0034-3617(10)70061-8.

Mohammed

Ansari

MNM

Pua

, et al. A review on natural fiber reinforced polymer composite and its applications. Int J Polym Sci 2015; 2015: 1–15.

Colamartino

Pinato

Cavasin

, et al. Static, dynamic and impact properties of a high-performance flax-fiber composite. Results Mater 2023; 20, 100493. DOI: 10.1016/j.rinma.2023.100493.(23).

Del Bianco

Giammaria

Boria

, et al. Flax and hemp composites: mechanical characterization and numerical modeling. Proc IMechE, Part C: J Mechanical Engineering Science 2023; 1–13. DOI: 10.1177/09544062231182036.

LS-DYNA Keyword User’s Manual Vol II, Material Models, R13, Livermore Software Technology, 2021.

Ricciardi

Papa

Lopresto

, et al. Experimental characterization of the crashworthiness of carbon fiber reinforced epoxy composites. Prog Aerosp Sci 2024; 148, 101003. DOI: 10.1016/j.paerosci.2024.101003.

Zhang

Sun

Zhao

, et al. Crashworthiness of different composite tubes by experiments and simulations. Compos B Eng 2018; 143: 86–95.

10.

Boria

Scattina

Belingardi

Axial energy absorption of CFRP truncated cones. Compos Struct 2015; 130: 18–28.

11.

Isaac

Ezekwem

. A review of the crashworthiness performance of energy absorbing composite structure within the context of materials, manufacturing and maintenance for sustainability. Compos Struct 2021; 257, 113081. DOI: 10.1016/j.compstruct.2020.113081.

12.

Capretti

Del Bianco

Giammaria

, et al. Natural Fibre and hybrid composite thin-walled structures for automotive crashworthiness: a review. Materials 2024; 17(10), 2246. DOI: 10.3390/ma17102246.

13.

Feraboli

Deleo

Garattoni

. Efforts in the standardization of composite materials crashworthiness energy absorption. In: 22nd American Society for Composites Technical Conference, 2007.

14.

Feraboli

Development of a corrugated test specimen for composite materials energy absorption. J Compos Mater 2008; 42(3): 229–256.

15.

Feraboli

Wade

Deleo

, et al. LS-DYNA MAT54 modeling of the axial crushing of a composite tape sinusoidal specimen. Composites 2011; 42(11): 1809–1825.

16.

Vigna

Development of an innovative procedure to assess the crashworthiness of composite materials. Doctoral Dissertation Doctoral Program in Mechanical Engineering, 2023.

17.

Garg

Babaei

Paolino

, et al. Predicting composite component behavior using element level crashworthiness tests, finite element analysis and automated parametric identification. Materials 2020; 13(20): 4501.

18.

Belingardi

Boria

Scattina

Delaminazione sperimentale e numerica di laminati in composito. AIAS, 40°Convegno Nazionale, 2011.

19.

Vigna

Calzolari

Galizia

, et al. Effect of friction on a crashworthiness test of flat composite plates. Forces Mech 2022; 6, 100070. DOI: 10.1016/j.finmec.2021.100070.

20.

Babaei

Garg

Vigna

, et al. Newly developed anti-buckling fixture to assess the In-plane crashworthiness of flat composite specimens. Appl Sci 2020; 10(21): 7797.

21.

Vigna

Calzolari

Galizia

, et al. Effect of impact speed and friction on the in-plane crashworthiness of composite plates. Procedia Struct Integr 2021; 33: 623–629.

22.

Rabiee

Ghasemnejad

Finite element modelling approach for progressive crushing of composite tubular absorbers in LS-DYNA: review and findings. J Compos Sci 2022; 6(1): 11. DOI: 10.3390/jcs6010011.

23.

David

Johnson

Voggenreiter

Analysis of crushing response of composite crashworthy structures. Appl Compos Mater 2013; 20(5): 773–787.

24.

David

Johnson

AF.

Effect of strain rate on the failure mechanisms and energy absorption in polymer composite elements under axial loading. Compos Struct 2015; 122: 430–439.