Anisogrid thermoplastic composite lattice structure by innovative out-of-autoclave process

Santoro, Daniele; Bellisario, Denise; Quadrini, Fabrizio; Santo, Loredana

doi:10.1007/s00170-020-05671-6

Cited by 14 publications

(12 citation statements)

References 26 publications

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“…The present work aims at presenting the results of buckling tests performed on cylindrical ACLSs, extending the results showed in [10]. In this case, cylindrical ACLS has been tested under axial compressive load to failure.…”

Section: Intr Introduction Oductionmentioning

confidence: 87%

“…In particular, the 105/35 heat-shrink tubing was used on the 80 mm cylindrical mold. A uniform consolidation pressure of 10 kPa can be approximately considered for all the sample length according to experimental data on heat-shrink tubes discussed in [10]. TP composites were consolidated for 1 h at 200°C in an oven.…”

Section: Cy Ylindrical a Lindrical Acl Cls Winding And Consolidation S Winding And Consolidationmentioning

confidence: 99%

“…In the case of the ACLS, the compression behavior of the individual ligaments should dominate the elastic response of the structures except for small regions close to the constraints. Material Young's moduli have been extracted experimentally and inserted in FE model according to calibration and validation procedure widely discussed in [10].…”

Section: Cy Ylindrical a Lindrical Acl Cls Winding And Consolidation S Winding And Consolidationmentioning

confidence: 99%

“…Numerical results match with the experimentation, providing a good ability to predict the buckling modes of ACLS. Due to the parametric nature of the numerical model and the calibration phase described in [10], it is very simple to evaluate the mechanical behavior of ACLS changing several geometrical parameters under the axial compressive loads.…”

Section: Conclusion Conclusionmentioning

confidence: 99%

“…TP composites generally exhibit greater toughness and higher resistance to impulsive loads resulting very promising for ACLSs application. The idea to introduce TP composites for ACLSs was treated in [10], where the authors developed a full technological assessment about manufacturing of TP ACLSs. In order to keep the manufacturing costs low, polypropylene (PP) TP matrix with glass fibers (GFs) prepregs was preferred.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

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Anisogrid lattice cylinders made of thermoplastic composite under buckling loading

Iorio¹,

Bellisario²,

Gallo³

et al. 2021

Esaform 2021

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Anisogrid lattice cylinders have been produced by means of an innovative out-of-autoclave (OOA) process by using thermoplastic prepreg. Unidirectional thermoplastic tapes with polypropylene matrix and glass fibers were wound on cylindrical mandrels at room temperature. Composite consolidation was achieved by using the compression of a heat-shrink tube during its shape recovery in oven. A cylindrical anisogrid lattice structure was manufactured and mechanically tested under vertical loading. Results from the buckling test revealed the optimal adhesion between prepreg layers after the out-of-autoclave molding. Numerical modelling of buckling has been performed to correlate the structural behavior of the anisogrid lattice cylinder with composite material properties and geometrical features. A parametric model of the lattice structure has been defined for this aim. The proposed manufacturing technology combines the advantages of thermoplastic composites (reparability, easy handling, easy storage, long prepreg life, productivity) with the designing potential of anisogrid lattice structures in terms of lightness and stiffness.

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Section: Intr Introduction Oductionmentioning

confidence: 87%

Section: Cy Ylindrical a Lindrical Acl Cls Winding And Consolidation S Winding And Consolidationmentioning

confidence: 99%

Section: Cy Ylindrical a Lindrical Acl Cls Winding And Consolidation S Winding And Consolidationmentioning

confidence: 99%

Section: Conclusion Conclusionmentioning

confidence: 99%

Section: Intr Introduction Oductionmentioning

confidence: 99%

See 3 more Smart Citations

Anisogrid lattice cylinders made of thermoplastic composite under buckling loading

Iorio¹,

Bellisario²,

Gallo³

et al. 2021

Esaform 2021

Self Cite

View full text Add to dashboard Cite

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Experimental and numerical studies on the low‐velocity impact response of carbon fiber‐reinforced polymer anisogrid cylindrical shells

Paramasivam¹,

Johnson²

2022

Polymer Composites

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This work presents the experimental and finite element (FE) simulations to investigate the behavior of both unstiffened and anisogrid composite cylindrical shells subjected to low‐velocity axial impact. Impact damage has been an epidemic problem for composite structures. Even subjected to a low‐velocity impact, thin‐walled composite structures may sacrifice its load‐carrying capacity considerably due to various modes of failure. A low cost, reliable and innovative manufacturing process is proposed for the production of anisogrid cylindrical lattice structures. Initially, test coupons are fabricated as per American Society for Testing of Materials (ASTM) standards and inspected using infrared (IR) thermography to find the imperfections incurred during fabrication. The test coupons without defects were only taken into account for material characterization. FE simulations were carried out on both the unstiffened and anisogrid shells using LS‐DYNA® for a series of low‐velocity impacts. Also these shell structures were subjected to impact loading experimentally for the validation of the numerical results. The results of these studies indicate that the anisogrid model presented in this work possesses a great load‐carrying capacity than an unstiffened shell under dynamic loading conditions, also the weight of the structure has been reduced up to 51.27%. Numerical simulation results are in good agreement with the experimental data, having less than 11.56% of maximum deviation on the energy absorption value.

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Compression behavior of 3D printed isogrid cylindrical shell structures using experimental and finite element modeling

Johnson¹,

Paramasivam²

2022

Polymer Composites

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Lattice structures have been widely used in aircraft and automobile industries due to their excellent mechanical properties namely high specific strength, specific stiffness, and energy absorption capability. On the other hand, additive manufacturing that is considered as an essential for Industry 4.0 offers incredible opportunities for product development and production flexibility. Previous research on 3D printed isogrid structures focused on isogrid panels and their buckling behavior, whereas isogrid lattice cylindrical shells garnered less attention. This work reports the effect of short carbon fiber reinforcement with polyamide three‐dimensional printing material on the compression response of isogrid lattice shell structures by experimental and numerical modeling. Isogrid cylindrical shells were three dimensionally printed using fused deposition modeling. Initially, test coupons were printed using polyamide and carbon fiber reinforced polyamide and their mechanical properties were found using uniaxial tensile testing. The obtained tensile properties were given as an input to the numerical modeling performed using LS‐DYNA®. The peak load and the maximum displacement of the printed isogrid lattice shells subjected to axial compression loads were experimentally evaluated. The numerical findings were compared with those produced using experimental methods. The error in estimating the peak load of lattice cylinders through numerical modeling was limited to 5.35%. The effect of geometric parameters namely rib width (helical and hoop), shell thickness, helical angle of ribs on the buckling strength was also studied.

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Anisogrid thermoplastic composite lattice structure by innovative out-of-autoclave process

Cited by 14 publications

References 26 publications

Anisogrid lattice cylinders made of thermoplastic composite under buckling loading

Anisogrid lattice cylinders made of thermoplastic composite under buckling loading

Experimental and numerical studies on the low‐velocity impact response of carbon fiber‐reinforced polymer anisogrid cylindrical shells

Compression behavior of 3D printed isogrid cylindrical shell structures using experimental and finite element modeling

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