TY - JOUR
T1 - Mesomechanical modeling of braided cords
AU - Barry, Catherine
AU - Panerai, Francesco
AU - Bergeron, Keith
AU - Stapleton, Scott
AU - Sherwood, James
N1 - This work was made possible by the help of several individuals. The authors appreciate the assistance of Patrick Drane and Kari White of UMass Lowell in the experimental characterization of the tows. The authors also thank Matt Schey and George Barlow of UMass Lowell and Eric Zhou and David Mollenhauer of the Air Force Research Lab in Dayton, OH for their help and guidance with the use of the VTMS software. Lastly, the authors thank Frank Olejarz of the U.S. Army Combat Capabilities Development Command, Soldier Center for his assistance in gaining access to the braided material. The authors acknowledge the U.S. Army Combat Capabilities Development Command, Soldier Center for its support of this work through Cooperative Agreement W911QY-15-2-0002.
PY - 2020
Y1 - 2020
N2 - Braided-cord reinforced textile composites have the potential to be a material system choice that can offer comparable specific-strength and specific-stiffness properties as woven and uniaxial fabric-reinforced composites with the added benefit of higher specific-energy absorption. This increase in energy absorption is a result of tube crushing at the mesoscale, i.e. analogous to the macroscale crushing of the braided tubes that are used for crash rails in cars. Much research has been devoted to understanding the mechanical behaviors of fabrics during forming. However, the same level of understanding for the mechanical behavior of braided cords during preforming does not yet exist. The current work seeks to gain an understanding of the contributing factors to the mechanical behavior of a braided cord during the forming process. In the current work, a mesomechanical finite element model of a polyethylene braided cord is investigated. CT-scans of the cord were taken under various preloads. The CT-scan data of the cord under zero load is used to create a geometric FEA model of the cord using the Virtual Textile Morphology Suite (VTMS) software. Tensile and transverse compression tests are performed on the individual tows to characterize the axial and transverse stiffnesses, and these data are used in an orthotropic material model. The finite element model of the cord is then pulled in tension, and the deformation of the cord is compared with the deformations in the CT-scan. Once the model is shown to represent the mechanical behavior of the braided cord, it can be numerically characterized and insight into certain properties such as the bending stiffness and torsional stiffness can be gained. The mesomechanical model can then be adjusted (number of tows, braid angle, etc.) to understand how braid design choices effect the deformation behavior of the braid during a preforming process.
AB - Braided-cord reinforced textile composites have the potential to be a material system choice that can offer comparable specific-strength and specific-stiffness properties as woven and uniaxial fabric-reinforced composites with the added benefit of higher specific-energy absorption. This increase in energy absorption is a result of tube crushing at the mesoscale, i.e. analogous to the macroscale crushing of the braided tubes that are used for crash rails in cars. Much research has been devoted to understanding the mechanical behaviors of fabrics during forming. However, the same level of understanding for the mechanical behavior of braided cords during preforming does not yet exist. The current work seeks to gain an understanding of the contributing factors to the mechanical behavior of a braided cord during the forming process. In the current work, a mesomechanical finite element model of a polyethylene braided cord is investigated. CT-scans of the cord were taken under various preloads. The CT-scan data of the cord under zero load is used to create a geometric FEA model of the cord using the Virtual Textile Morphology Suite (VTMS) software. Tensile and transverse compression tests are performed on the individual tows to characterize the axial and transverse stiffnesses, and these data are used in an orthotropic material model. The finite element model of the cord is then pulled in tension, and the deformation of the cord is compared with the deformations in the CT-scan. Once the model is shown to represent the mechanical behavior of the braided cord, it can be numerically characterized and insight into certain properties such as the bending stiffness and torsional stiffness can be gained. The mesomechanical model can then be adjusted (number of tows, braid angle, etc.) to understand how braid design choices effect the deformation behavior of the braid during a preforming process.
KW - Braided cord
KW - Composite
KW - Finite element
KW - Textile
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U2 - 10.1016/j.promfg.2020.04.163
DO - 10.1016/j.promfg.2020.04.163
M3 - Conference article
AN - SCOPUS:85085477546
SN - 2351-9789
VL - 47
SP - 162
EP - 168
JO - 48th SME North American Manufacturing Research Conference, NAMRC 48
JF - 48th SME North American Manufacturing Research Conference, NAMRC 48
T2 - 23rd International Conference on Material Forming, ESAFORM 2020
Y2 - 4 May 2020
ER -