Relating Nonuniform Deformations to Fracture in Uniaxially Loaded Non-Woven Fiber Networks

Na, Y. J.; Muhlstein, Christopher L.

doi:10.1007/s11340-019-00527-x

Cited by 6 publications

(9 citation statements)

References 30 publications

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“…The fibers in this study ("Methods" and ref. 3 ) had an average length of 1.4 mm and diameter of 22 μm. Both the higher and lower fiber density regions (also known as floc and interfloc, respectively) had characteristic length scales on the order of several millimeters 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The uniaxial tensile behavior and analysis methods were detailed in ref. 3 . Briefly, 60 specimens were tested for each of the two principal orientations, machine direction (MD), and cross-machine direction (CD).…”

Section: Methodsmentioning

confidence: 99%

“…A constant, nominal thickness of 100 μm was determined using scanning electron microscopy images of Spurr's epoxy infiltrated and polished cross-sections of the paper (see ref. 3 ). The elastic modulus was calculated from the linear portion of a stress-strain curve consistent with the methods detailed in ASTM E111.…”

Section: Methodsmentioning

confidence: 99%

“…The spatial distribution of deformation and strains were evaluated by an inhouse DIC programs developed in Python 3,16 , which were based on both conventional feature tracking and optical flow (Lucas-Kanade) algorithms 17,18 . Strain maps based on the motion of tracked positions were plotted using a linearly interpolated Voronoi tesselation scheme.…”

Section: Methodsmentioning

confidence: 99%

“…This mechanical anisotropy comes from preferential fiber alignment in the MD: the elastic modulus, yield strength, and ultimate strength are typically larger in the MD as compared with CD (two to three times larger for a copy paper as we reported in ref. 3 and shown in Supplementary Table 1 and Fig. 1).…”

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confidence: 99%

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High-cycle fatigue damage accumulation in paper

Paluskiewicz

Muhlstein

2020

Commun Mater

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The mechanical durability of paper is a key consideration for applications ranging from shipping boxes to disposable medical substrates. Paper commonly experiences fatigue loading in such applications, but a high-cycle fatigue mechanism has not been identified. This research details paper's high-cycle fatigue degradation mechanism. Paper specimens were loaded with monotonically increasing, constant, and sinusoidally varying cyclic stresses, and the resulting tensile, creep, and fatigue damage accumulation rates were compared. The difficulty in defining the size and growth of cracks in paper's cellulosic fiber network were overcome with optically measured strain fields. We found that fatigue damage can accumulate via a fiber fracture mechanism, while ratchetting, creep, and tensile overload damage accumulation occurs due to failure of inter-fiber bonds. We also discovered the synergistic interaction between creep and high-cycle fatigue damage accumulation mechanisms, which is critical for extending the high-cycle fatigue life of paper.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%