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Parsons, M.; Stepanov, E. V.; Hiltner, A.; Baer, E.

doi:10.1023/a:1004616728535

Cited by 66 publications

(12 citation statements)

References 20 publications

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“…Once the craze fibrils have developed, crack propagation is accomplished through the rupture of the extended craze fibrils. Many investigations indicate that the fracture process in a creep test (like PENT) occurs in a stepwise fashion with the craze-zone formation and crack growth processes proceeding sequentially [11,[35][36][37]. As the crack propagates, the ligament area decreases; this means, the ligament stress increases steadily during the test.…”

Section: Results: Brittle Failurementioning

confidence: 99%

Analysis of ductile and brittle failures from creep rupture testing of high-density polyethylene (HDPE) pipes

Krishnaswamy

2005

Polymer

120

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Section: Results: Brittle Failurementioning

confidence: 99%

Analysis of ductile and brittle failures from creep rupture testing of high-density polyethylene (HDPE) pipes

Krishnaswamy

2005

Polymer

120

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“…As the model stands now, we believe that it should apply to any elastic materials for which a structure at a mesoscopic scale exists. For example, it would be interesting to understand if the model can explain crack jump dynamics observed in semicrystalline polymers [18]. To conclude, we have shown that a simple model of thermally activated crack dynamics is able to reproduce with good accuracy the step size distribution of the crack growth.…”

mentioning

confidence: 76%

Subcritical Statistics in Rupture of Fibrous Materials: Experiments and Model

2004

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We study experimentally the slow growth of a single crack in a fibrous material and observe stepwise growth dynamics. We model the material as a lattice where the crack is pinned by elastic traps and grows due to thermally activated stress fluctuations. In agreement with experimental data we find that the distribution of step sizes follows subcritical point statistics with a power law (exponent 3/2) and a stress-dependent exponential cutoff diverging at the critical rupture threshold.

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“…The analytical procedure of calculating the irreversible energy was proposed by Ellyin et al [11,13]. Later, several methods for the evaluation of fatigue damage have been reported [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. However, the calculated value of dW i is not accurate due to the nonlinear deformation and fatigue damage processes [12].…”

Section: Evaluation Of Fatigue Damage By Energy-based Approachmentioning

confidence: 99%

Fatigue Fracture Resistance Analysis of Polymer Composites Based on the Energy Expended on Damage Formation

Aglan

Gan

Chu

et al. 2003

Journal of Reinforced Plastics and Composites

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Analysis of the fatigue crack propagation behavior of filled polytetrafluoroethylene (PTFE) composites using the energy expended on damage formation was performed. A 25% chopped glass fiber filled PTFE with a commercial name of Rulon LR and a 25% polymer particle filled PTFE (Rulon J) were chosen as candidate materials for the study. Fatigue crack propagation (FCP) tests were performed using both unnotched and single edge notched (SEN) specimens under tension-tension load control condition. The notched specimens were prepared with the same notch length to sample width ratio (a/w) of 0.09. The applied frequency was 3 Hz. The maximum stress was 6 MPa, and the ratio of minimum stress to maximum stress was kept at 0.10. FCP data such as the crack length and the number of cycles were used to calculate the crack speed. The hysteresis energies for both notched and unnotched specimens during cyclic loading were obtained. The energy release rate was determined as the first derivative of the relationship between the potential energy and the crack length. The potential energy was calculated as the area above the unloading curve from the hysteresis loops at various crack lengths. The cyclic rate of energy dissipation on damage formation was calculated based on the hysteresis energies for both notched and unnotched specimens. It was found that the fatigue kinetics are related to the cyclic rate of energy dissipation into the active zone evolution. The specific energy of damage ( 0 ), a material parameter characteristic of the fatigue fracture resistance was evaluated using the Modified Crack Layer (MCL) theory. It was found that the value of 0 for the particle filled PTFE is 3200 kJ/m 3 , which is about three times higher than that for the fiber filled PTFE (750 kJ/m 3 ). This indicates that the particle filled PTFE has higher fracture resistance than the fiber filled PTFE. The fracture surface of the second region for both materials was examined using scanning electron microscopy (SEM). Interfacial debonding, drawn ligaments and large voids were associated with the fatigue fracture Downloaded from of the fiber filled PTFE. The particle filled PTFE displayed more fibrillation than that of the fiber filled PTFE, which indicates a higher energy consuming process related to the fatigue crack growth in the particle filled PTFE.KEY WORDS: particle and fiber filled PTFE composites, fatigue, energy on damage formation, modified crack layer (MCL) theory, specific energy of damage, fracture surface morphology.

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Untitled

Cited by 66 publications

References 20 publications

Analysis of ductile and brittle failures from creep rupture testing of high-density polyethylene (HDPE) pipes

Analysis of ductile and brittle failures from creep rupture testing of high-density polyethylene (HDPE) pipes

Subcritical Statistics in Rupture of Fibrous Materials: Experiments and Model

Fatigue Fracture Resistance Analysis of Polymer Composites Based on the Energy Expended on Damage Formation

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