Influence of absorbed moisture on fatigue crack propagation behaviour in polyamides

Bretz, P. E.; Hertzberg, R. W.; Manson, J. A.

doi:10.1007/bf00542365

Cited by 32 publications

(20 citation statements)

References 5 publications

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“…4. At 80°C and above, the tensile strength and Young's modulus decreased further, while the elongation or strain to failure increased.…”

Section: Discussionmentioning

confidence: 92%

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Mechanical Performance of Polyamides with Influence of Moisture and Temperature – Accurate Evaluation and Better Understanding

Jia

Kagan

2001

Plastics Failure Analysis and Prevention

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“…4. At 80°C and above, the tensile strength and Young's modulus decreased further, while the elongation or strain to failure increased.…”

Section: Discussionmentioning

confidence: 92%

“…4 The absorbed moisture (~2.5 wt%) decreased fatigue crack growth rates, which might reflect the ability of tightly bounded water to enhance chain mobility. 4 The absorbed moisture (~2.5 wt%) decreased fatigue crack growth rates, which might reflect the ability of tightly bounded water to enhance chain mobility.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance of Polyamides with Influence of Moisture and Temperature – Accurate Evaluation and Better Understanding

Jia

Kagan

2001

Plastics Failure Analysis and Prevention

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“…5) 3. Results Figure 1 plots changes in the overweight of nylon6 and its composites dispersed at each volume fraction (%) of aluminum powders versus dipping time in hot salt solution (3 mass%NaCl in distilled water) and distilled water at 373 K. Results indicated that dipping in both hot salt solution and distilled water increased the mass of all samples.…”

Section: Mass Measurement Of Water Absorptionmentioning

confidence: 99%

“…However, water absorption, which causes softening 4,5) and high growth rate of fatigue crack, 5) is often observed in nylon6. Although water absorption enhances the impact value of nylon6 and its composites, 6) the effect of water absorption on expansion and softening is a serious problem.…”

Section: Introductionmentioning

confidence: 99%

Overweight of Nylon6 Composites Dispersed with Aluminum Powders by Dipping in Hot Salt Solution (3 mass%NaCl in Distilled Water)

2009

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The influence of dipping in hot salt solution on water absorption in nylon6 composites with dispersed aluminum powders was investigated. Dipping in hot salt solution (3 mass%NaCl in distilled water) for 10 5 s at 373 K increased the overweight of composite samples, whereas the addition of aluminum with dispersed powders (A1-addition) from zero to 40 vol%Al decreased the overweigh of the sample. Based on the experiment results and kinetic analysis, aluminum powder dispersion in nylon6 decreased the saturated overweigh of composites at infinite time. Both hot salt dipping and Al addition increased the reaction index (n). The Al addition apparently increased the n value of composites with less than 20 vol%Al in salt solution, as well as with less than 30 vol%Al in distilled water. The A1 addition apparently increased the kinetic constant (k) at less than 20 vol%Al in hot salt solution. However, the Al addition decreased the k value of composites at more than 30 vol%Al in hot salt dipping, as same as that of the composites dipped in hot distilled water. Compared with dipping in distilled water, dipping in hot salt solution apparently decreased the saturated overweigh and remarkably increased both n and k values of nylon6 composites with 10 and 20 vol%Al. Since Electron Probe Micro Analyzer (EPMA) analysis could not clearly detect sodium (Na) in the nylon6 matrix, the reaction rate of nylon6 composites dipped in hot salt solution was probably dominated by an interface control process.

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“…6,7) Furthermore, it is also expected to be utilized for the spaceship fuel tank materials. 8,9) However, water absorption, which causes softening 10,11) and high growth rate of fatigue crack, 11) is often observed in nylon6. Although water absorption enhances the impact value of nylon6 and its composites, 12) the influence of water absorption on expansion and softening is a serious problem, as well as other polymers and their composites.…”

Section: Introductionmentioning

confidence: 99%

Mass Gain of Carbon Fiber Reinforced Polyimide (CFRP) by Dipping in Hot Distilled Water

et al. 2012

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Influence of isothermal dipping in hot distilled water for 200 ks on the mass gain of carbon fiber reinforced polyimide (CFRP) was investigated. Dipping in distilled water raised the mass gain. Based on the kinetics equation, both reaction index (n) and kinetic constant (k) were obtained. Since the n value is approximately 0.6 from 333 to 373 K, the reaction mode was independent on the absorption temperature. Based on the results and discussion, the water absorption was probably the directional mass transport through the fiber/polyimide cylindrical interface. On the other hand, Arrhenius linear relationship between logarithmic k (log k) and reciprocal dipping temperature (1/T) was obtained. The apparent activation energy estimated by the slope of water absorption in the CFRP was approximately equal to the activation energy of self-diffusion coefficient of water molecule. Mass gain of CFRP (CF/PI) dipped in distilled water for 100 ks at 373 K probably enhanced the molecules' density induced by water molecules' intrusion among polyimide polymers, resulting in enhancement of (d·/d¾) max and fracture stress. On the other hand, the mass gain by dipping for 200 ks at 373 K enriched the water concentration in polyimide matrix. Thus, it was assumed to enhance the intermolecular distance of polyimide polymers and then to reduce the intermolecular force among polyimide polymers, resulting in a drop of (d·/d¾) max of CFRP dipped for 200 ks. On the other hand, the dipping for 200 ks probably raised the intermolecular force between water molecules and polyimide polymers, resulting in remarkable enhancements of the fracture strain, fracture energy and impact value of the CFRP.

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Influence of absorbed moisture on fatigue crack propagation behaviour in polyamides

Cited by 32 publications

References 5 publications

Mechanical Performance of Polyamides with Influence of Moisture and Temperature – Accurate Evaluation and Better Understanding

Mechanical Performance of Polyamides with Influence of Moisture and Temperature – Accurate Evaluation and Better Understanding

Overweight of Nylon6 Composites Dispersed with Aluminum Powders by Dipping in Hot Salt Solution (3 mass%NaCl in Distilled Water)

Mass Gain of Carbon Fiber Reinforced Polyimide (CFRP) by Dipping in Hot Distilled Water

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