Nonlinear indentation of fibers

McAllister, Quinn P.; Gillespie, John W.; VanLandingham, Mark R.

doi:10.1557/jmr.2011.336

Cited by 27 publications

(15 citation statements)

References 41 publications

(53 reference statements)

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“…To prepare the fibers for indentation and subsequent tensile testing, a combination of a fiber mounting procedure for indentation that is described in detail in Ref. [25] and an end tabbing technique used for single fiber tensile testing, established in ASTM D 3379-75, 26 was used. Single fiber samples were secured over a window ($25 mm gauge length) cut out of a cardboard rectangle.…”

Section: Fiber Strength Retentionmentioning

confidence: 99%

The energy dissipative mechanisms of particle-fiber interactions in a textile composite

McAllister

Gillespie

VanLandingham

2013

Journal of Composite Materials

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Nanoindentation and nanoscratch tests made on the surface of Kevlar KM2 fibers impart contact geometries similar to a typical contact between a particle and a fiber in a particle-infused fabric. In this study, the forces required for indentation and scratching are used as a measure of a single particle gouge of the surface of a Kevlar fiber. The gouging forces and a geometric model are used to calculate the apparent friction and energy associated with particle gouging during impact. The friction associated with particle gouging can be increased up to ∼240% compared to Kevlar yarn-yarn friction levels. The energy of gouging a distribution of particles is on the order of 10% of the energy required for axial tensile failure and 25% of the energy required for transverse compression of the fiber (for a limiting transverse strain of ∼0.3). The relative contributions of the friction and energy associated with particle gouging to the overall energy dissipated by a textile composite are discussed.

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Section: Fiber Strength Retentionmentioning

confidence: 99%

The energy dissipative mechanisms of particle-fiber interactions in a textile composite

McAllister

Gillespie

VanLandingham

2013

Journal of Composite Materials

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“…Modifications to the theory must be made if the samples violate these assumptions . Recent work on the indentation of cylindrical fibers includes modified analyses that account for sample geometry . The Supporting Information includes an analysis for determining a modified contact depth

h_{c}^{*}

for sample curvature.…”

Section: Introductionmentioning

confidence: 99%

Interfacial mechanical behavior of 3D printed ABS

Cole

Riddick

Jaim

et al. 2016

J of Applied Polymer Sci

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We describe an experimental approach for characterizing the local mechanical behavior of acrylonitrile butadiene styrene (ABS) structures processed through fused deposition modeling. ABS test specimens processed in various build orientations were subject to multiscale mechanical tests as well as local morphology and chemical analyses. Instrumented indentation, local dynamic mechanical analysis, and atomic force microscopy tests were used to explore the mechanical behavior and morphology of build surfaces and weld interfaces. An interfacial stiffening effect was found for the majority of the specimens tested, with up to a 40% increase in the indentation elastic modulus measured with respect to the build surfaces. Raman spectroscopy mapping of the interfacial areas revealed $30% less butadiene/styrene and butadiene/acrylonitrile ratios with respect to analysis of the build surfaces. The results provide insight into the multiscale behavior of additive manufactured structures and offer the potential to guide processing-structureproperty understanding of these materials.

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“…where ϕ is the half-apical angle of the indenter. A full derivation of the contact height and Equation 11 is available in [ 26 ]. As shown in Figure 4c , the deviation of the correction factor to unity is about 23% and 12% for E /σ y = 10 and E /σ y = 20, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The elastic modulus of nanoindentation was calculated via the Oliver–Pharr method. We found that the contact height [ 26 ] is unsuitable to replace the contact depth for obtaining the indentation elastic modulus of microspherical materials.…”

Section: Introductionmentioning

confidence: 99%

Determination of elastic moduli of elastic–plastic microspherical materials using nanoindentation simulation without mechanical polishing

Li¹,

Chen²

2021

Beilstein J. Nanotechnol.

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When using the Oliver–Pharr method, the indented specimen is assumed to be a perfectly flat surface, thus ignoring the influences of surface roughness that might be encountered in experiment. For nanoindentation measurements, a flat surface is fabricated from curved specimens by mechanical polishing. However, the position of the polished curved surface cannot be controlled. There are no reliable theoretical or experimental methods to evaluate the mechanical behavior during nanoindentation of an elastic–plastic microsphere. Therefore, it is necessary to conduct reliable numerical simulations to evaluate this behavior. This article reports a systematic computational study regarding the instrumented nanoindentation of elastic–plastic microspherical materials. The ratio between elastic modulus of the microsphere and the initial yield stress of the microsphere was systematically varied from 10 to 1000 to cover the mechanical properties of most materials encountered in engineering. The simulated results indicate that contact height is unsuitable to replace contact depth for obtaining the indentation elastic modulus of microspherical materials. The extracted elastic modulus of a microsphere using the Oliver–Pharr method with the simulated unloading curve depends on the indentation depth. It demonstrates that nanoindentation on microspherical materials exhibits a “size effect”.

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Nonlinear indentation of fibers

Cited by 27 publications

References 41 publications

The energy dissipative mechanisms of particle-fiber interactions in a textile composite

The energy dissipative mechanisms of particle-fiber interactions in a textile composite

Interfacial mechanical behavior of 3D printed ABS

Determination of elastic moduli of elastic–plastic microspherical materials using nanoindentation simulation without mechanical polishing

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