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

2020 ◽  
Vol 109 (7-8) ◽  
pp. 1941-1952 ◽  
Author(s):  
Daniele Santoro ◽  
Denise Bellisario ◽  
Fabrizio Quadrini ◽  
Loredana Santo
Keyword(s):  
Lattice Structure ◽  
Thermoplastic Composite ◽  
Autoclave Process ◽  
Out Of Autoclave ◽  
Composite Lattice

Conical Thermoplastic Composite Anisogrid Lattice Structure by Innovative Out-of-Autoclave Molding Process

2021 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Daniele Santoro ◽  
Leandro Iorio ◽  
Loredana Santo
Keyword(s):  
Mechanical Performance ◽  
Lattice Structure ◽  
Glass Fibers ◽  
Density Measurement ◽  
Thermoplastic Composite ◽  
Molding Process ◽  
Conical Structure ◽  
Out Of Autoclave ◽  
Composite Lattice

Abstract A new manufacturing process for thermoplastic (TP) composite parts has been used to produce conical anisogrid composite lattice structure (ACLS). An out-of-autoclave (OOA) process has been prototyped by using the compaction exerted by a heat-shrink tube after its exposition to heat in oven. Narrow thermoplastic prepreg tapes have been wounded on a metallic conical patterned mold at room temperature; then, the conical structure has been inserted in the heat-shrink tube and heated. TP unidirectional prepreg tapes have been used with polypropylene matrix and glass fibers. After molding, the TP ACLS has been tested under axial and transverse compression. Conical adapters were used in the transverse loading condition to allow uniform application of the load. Density measurement has been also performed to assess the quality of the OOA process. Results of this study show that TP ACLS with complex shape may be produced with OOA solutions without affecting mechanical performance. In fact, porosity levels of the consolidate ACLS are comparable with the initial prepreg despite of the absence of vacuum during molding. Moreover, high compressive stiffness was measured along both directions without observing damages, buckling or cracks in multiple tests. In the future, this kind of technology could be used for larger ACLSs by substituting the heat-shrink tube with a narrow tape to be wound as well after lamination.

scholarly journals Anisogrid lattice cylinders made of thermoplastic composite under buckling loading

2021 ◽  
Author(s):  
Leandro Iorio ◽  
Denise Bellisario ◽  
Nicola Gallo ◽  
Claudia Papa ◽  
Marco Regi ◽  
...  
Keyword(s):  
Shape Recovery ◽  
Lattice Structure ◽  
Glass Fibers ◽  
Thermoplastic Composite ◽  
Thermoplastic Composites ◽  
Vertical Loading ◽  
Geometrical Features ◽  
Polypropylene Matrix ◽  
Out Of Autoclave ◽  
Buckling Test

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.

Out-of-autoclave Process and Automation: A Successful Path to Highly Integrated and Cost Efficient Composite Wing Moveables

2019 ◽  
Author(s):  
Thibault de Lumley ◽  
François Mathieu ◽  
Didier Cornet ◽  
Dimitri Gueuning ◽  
Nicolas Van Hille
Keyword(s):  
Autoclave Process ◽  
Cost Efficient ◽  
Out Of Autoclave ◽  
Composite Wing

Design of a unitized thermoplastic composite out-of-autoclave three-bay wingbox demonstrator

2021 ◽  
Author(s):  
Vincenzo Oliveri ◽  
Giovanni Zucco ◽  
Mohammad Rouhi ◽  
Enzo Cosentino ◽  
Trevor Young ◽  
...  
Keyword(s):  
Thermoplastic Composite ◽  
Out Of Autoclave

scholarly journals Structure Safety Analysis of Composite Lattice Structure with Inspection Window

2018 ◽  
Vol 22 (6) ◽  
pp. 94-103
Author(s):  
Dong-geon Kim ◽  
Ju-chan Bae ◽  
Jo-wha Son ◽  
Sang-woo Lee
Keyword(s):  
Lattice Structure ◽  
Safety Analysis ◽  
Composite Lattice

Compression behavior of selected laser melted Al/quasicrystal composite lattice structure

2019 ◽  
Vol 31 (2) ◽  
pp. 022311
Author(s):  
N. Kang ◽  
X. Lin ◽  
J. Xu ◽  
D. Joguet ◽  
Q. Li ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Compression Behavior ◽  
Composite Lattice

Reconfigurable Multi-Stable Helical Lattice

2020 ◽  
Author(s):  
Seán Carey ◽  
Ciarán McHale ◽  
Vincenzo Oliveri ◽  
Paul M. Weaver
Keyword(s):  
Permanent Magnets ◽  
Lattice Structure ◽  
Bacteriophage T4 ◽  
Discrete Topology ◽  
Element Analysis ◽  
Before And After ◽  
Potential Applications ◽  
Tail Structure ◽  
The Difference ◽  
Composite Lattice

Abstract As materials and engineering design tools become more complex, engineers are looking to mimic structures and systems, occurring in nature, to design more efficient mechanical structures. One such structure is a morphing composite lattice structure, whose design was inspired by the tail of the bacteriophage T4 virus [1]. To date the morphing behavior of the tail structure of the virus has been simplified by neglecting the intermolecular mechanisms that actuate the bistable behavior of the tail. This behavior has been achieved using prestressed composite flanges that are mechanically joined in alternating clockwise and anti-clockwise chiralities. The composite lattice structure has previously been proposed as an actuator for aerospace structures, replacing more complex and heavier traditional actuator structures. McHale et al. [2] have shown that the composite lattice is capable of greatly improving upon the state-of-the-art in the form of a telescopic boom for CubeSat systems. This utility provides validity in studying further enhancements on the capabilities of the structure to enhance its potential applications in the aerospace industry. This work proposes a mechanism for replicating the inter-molecular behavior that occurs in the bacteriophage T4 tail. The bonds between the inner and outer tail structures are broken and reformed, thus, driving the actuation process. This method will form a variable topology morphing system. As such, a novel category of morphing structure is presented here for the first time. The morphing topology behavior is proposed by replacing mechanical fasteners in the traditional lattice structure in select locations with a series of permanent magnets. Finite element analysis is used to calculate the difference in energies between the states before and after discrete topology changes occur, allowing the associated change in energy to be converted to a required actuation force. Varying the topology of the lattice structure allows the lattice to transition from a linear morphing actuator system to a bespoke and tunable curved actuator with potential applications in satellite dish actuation, for example.

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