Molecular-Level Study of the Effect of Prior Axial Compression/Torsion on the Axial-Tensile Strength of PPTA Fibers

Grujičić, M.; Yavari, R.; Ramaswami, S.; Snipes, J. S.; Yen, Chian-Fong; Cheeseman, B. A.

doi:10.1007/s11665-013-0648-2

Cited by 27 publications

(41 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Grujicic et al 56,[62][63][64][65] reported that defect's type, size and concentration are sensitive functions of the PPTA fiber fabrication (polymer synthesis, dope preparation and spinning process) -which are summarized in the present review in section 2.…”

Section: Structural Defectsmentioning

confidence: 95%

“…An outstanding analysis of PPTA fibers at multi scale levels is investigated by Grujicic et al 56,[62][63][64][65] . The computational investigations properly described the material models which are used to achieve the material (PPTA) behaviour at the length-scale levels from chemical structure (atoms) to composite structure (laminate) with brief description in eight levels.…”

Section: Ppta Computational Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review

et al. 2014

View full text Add to dashboard Cite

Poly (p-phenylene terephthalamide) fibers prepared by wet or dry-jet wet spinning processes have a notable response to very brief heat treatment (seconds) under tension. The modulus of the as-spun fiber can be greatly affected by the heat treatment conditions (temperature, tension and duration). The crystallite orientation and the fiber modulus will increase by this short-term heating under tension. Poly (p-phenylene terephthalamide) fibers have a very high molecular orientation (orientation angle 12-20°). Kevlar  and Twaron  fibers are poly (p-phenylene terephthalamide) fibers. This review reports for PPTA fibers the heat treatment techniques, devices and its process conditions. It reports in details the structural relationships between the fiber properties which are influenced by the heat treatment process. In particular, focused deeply on the effect of the crystal structure and the morphology of the fibers on the mechanical properties of PPTA fibers.

show abstract

Section: Structural Defectsmentioning

confidence: 95%

Section: Ppta Computational Modellingmentioning

confidence: 99%

Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The effect of AC and TC deformation modes on the fiber tensile failure strength has not been studied extensively. There are few atomistic simulations studies [20][21][22][23][24][25] that focused on the elastic and strength properties of Kevlar ® and PE crystal. Rutledge et al [20] have determined the elastic properties of Kevlar ® crystal through atomistic simulations.…”

Section: Introductionmentioning

confidence: 99%

“…Rutledge et al [20] have determined the elastic properties of Kevlar ® crystal through atomistic simulations. Grujicic et al [21,22] studied the properties of Kevlar ® filament using non-reactive force field COMPASS (Condensed-phase Optimized Molecular Potentials for Atomistic Simulation Studies) [26]. In one study [21], they investigated the effects of microstructural and topological defects such as chain ends, inorganic-solvent impurities, chain misalignments, and sheet stacking faults on the strength, ductility, and stiffness of PPTA filament.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Modeling of the Effect of Axial and Transverse Compression on the Residual Tensile Properties of Ballistic Fiber

Chowdhury

Sockalingam

Gillespie

2017

Fibers

View full text Add to dashboard Cite

Ballistic impact induces multiaxial loading on Kevlar ® and polyethylene fibers used in protective armor systems. The influence of multiaxial loading on fiber failure is not well understood. Experiments show reduction in the tensile strength of these fibers after axial and transverse compression. In this paper, we use molecular dynamics (MD) simulations to explain and develop a fundamental understanding of this experimental observation since the property reduction mechanism evolves from the atomistic level. An all-atom MD method is used where bonded and non-bonded atomic interactions are described through a state-of-the-art reactive force field. Monotonic tension simulations in three principal directions of the models are conducted to determine the anisotropic elastic and strength properties. Then the models are subjected to multi-axial loads-axial compression, followed by axial tension and transverse compression, followed by axial tension. MD simulation results indicate that pre-compression distorts the crystal structure, inducing preloading of the covalent bonds and resulting in lower tensile properties.

show abstract

“…The resulting defects can also degrade mechanical properties of the PPTAbased materials, and their effect has to be accounted for in the analysis of the ballisticprotection resistance of the PPTA-based materials. To address this problem, a series of allatom and coarse-grained molecular-level computational analyses is carried out in the present work [11][12][13]. Specifically, the effect of the preludial handling-induced deformation modes such as fiber/yarn transverse compression due to inter-yarn contacts, fiber/yarn twist/axialcompression, and fiber/yarn bending (encountered primarily in warp yarns) and the associated formation of kink-bands has been investigated.…”

Section: Effect Of Fiber-/yarn-handling-induced Defects On Ppta-fibermentioning

confidence: 99%

Multi-length Scale Material Model Development for Armorgrade Composites

Grujičić¹

2014

View full text Add to dashboard Cite

The present work was focused on establishing microstructure/property relationships in p-phenylene terephthalamide (PPTA) based materials and structures. A multi-length-scale computational approach has been developed in order to identify and quantify the contribution of various microstructural features and processes, at different lengthscales, to the macroscopic-level ballistic-penetration resistance of PPTA-based fabric or PPTA-fiber-reinforced polymer-matrix composites. Specifically, the role of various material-synthesis-/fiber-processing-induced defects, as well as defects induced during the weaving process, was investigated. The results obtained clearly revealed that The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, ABSTRACT Multi-length Scale Material Model Development for Armor-grade Composites Report TitleThe present work was focused on establishing microstructure/property relationships in p-phenylene terephthalamide (PPTA) based materials and structures. A multi-length-scale computational approach has been developed in order to identify and quantify the contribution of various microstructural features and processes, at different length-scales, to the macroscopic-level ballistic-penetration resistance of PPTA-based fabric or PPTA-fiber-reinforced polymer-matrix composites. Specifically, the role of various material-synthesis-/fiber-processing-induced defects, as well as defects induced during the weaving process, was investigated. The results obtained clearly revealed that both the static mechanical material properties such as stiffness and strength, and the dynamic-impact properties such as V50, are affected by the type and the concentration of various defects. Lastly, it was demonstrated that in order to construct a high-fidelity continuum-level PPTA-based material constitutive model, the role of the material microstructure (including defects) at different length-scales must be taken into account. (a) Papers published in peer-reviewed journals (N/A for none)Enter List of papers submitted or published that acknowledge ARO support from the start of the project to the date of this printing. List the papers, including journal references, in the following categories:

show abstract

Molecular-Level Study of the Effect of Prior Axial Compression/Torsion on the Axial-Tensile Strength of PPTA Fibers

Cited by 27 publications

References 25 publications

Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review

Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review

Molecular Dynamics Modeling of the Effect of Axial and Transverse Compression on the Residual Tensile Properties of Ballistic Fiber

Multi-length Scale Material Model Development for Armorgrade Composites

Contact Info

Product

Resources

About