Fatigue of polymer composites:  Life prediction and environmental effects

Dittenber, David

doi:10.33915/etd.3294

Cited by 2 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the last 20 years there has been considerable progress in the development of new polymeric materials, particularly composites reinforced with natural fibers and minerals, for applications in aero-naval, petrochemical, marine and automotive industries, as well as in construction [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polypropylene Composites with High Levels of Coir Short Fiber for Use in Products by Injection

Passatore

Leão

Rosa

2015

KEM

View full text Add to dashboard Cite

The main objective of this investigation was to study the properties of composites of polypropylene (PP) containing different proportions (20, 40 and 60% wt%) of coir short fiber (natural vegetable fiber) without treatment of fibers, for use in products by injection with applications in the automotive industries, construction and other segments. Samples were prepared in a only stage using a high intensity thermokinetic mixer (K-Mixer). Additives were used in the mass fraction of 3 wt% compatibilizer (PP-g-MA), 2.2 wt% processing additive and 0.12 wt% thermal antioxidant. The composites were characterized by tensile test according to ASTM D638-10. The surface properties of the polymeric matrix with additives were studied by determining the contact angle (CA) in a sessile drop tensiometer and the carbonyl index (CI) by Fourier-transform infrared spectroscopy (FTIR). Thermal properties of the PP and the composition were evaluated by thermogravimetric test, and the interface of the fiber and the matrix in the composites were evaluated using images from scanning electron microscopy (SEM). The CA analysis showed that the PP matrix with additives has become less hydrophobic and the FTIR and the CI that there was a better stabilization of the PP with additives. There was an increase in thermal stability of the composites for all fiber content, which was up to 15 °C above PP for coir fiber composites. In the Young's modulus values showed that the inclusion of fibers reinforced the polymeric matrix and increased the stiffness of the composites, especially in composites containing 60% (wt%) in which the values were ~1.7 times greater than the polypropylene. Images of micrographs showed the interaction of the fiber in the matrix and that despite the hydrophilic character of the fibers and hydrophobic character of the PP, the composites showed non-homogeneous interfaces. These findings confirm the feasibility of using high level of coir fiber in polypropylene composites even without pretreatment of the fibers and the preparation of samples by injection.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation of Polypropylene Composites with High Levels of Coir Short Fiber for Use in Products by Injection

Passatore

Leão

Rosa

2015

KEM

View full text Add to dashboard Cite

show abstract

“…Khalifa et.al [6] studied the fatigue behaviors of composite material manufactured for this paper by stacking four layers of E-glass fiber in different angle orientations [0, ±45, 0/90] degree immersed in polyester resin with total thickness of 4mm, the results showed that failure of laminas at ±45, and, 0/90 degree is due to matrix failure in the direction of fiber, whereas for unidirectional lamina at 0 degree the failure is due to fiber breakages. David Dittenber [7] studied the effect of environment conditions on fatigue life, a regimen of test was performed on a glass/vinyl ester composite. The testing included bending fatigue test, with each type being performed under varying environmental conditions in the forms of elevated temperature and the presence of salt water.…”

Section: Introductionmentioning

confidence: 99%

Applying Non-linear Damage Model for Predicating Corrosion Effect on Fatigue Life of (carbon + glass) Fibers / PMMA Composite

Majeed¹,

Fahad²

2012

ETJ

View full text Add to dashboard Cite

The objective of this work is to investigate the salt water effects on fatigue degradation, and stress-life relationship. A series of reversed fatigue experiments were conducted on (carbon+ glass) / PMMA of salt water environments. Results indicate that the composite degrade during cycling. Exposure to salt water (salt water is used to simulate the sea water) provides the most significant reduction in fatigue life. The corrosion environment reduces the fatigue strength by 61% compared to dry fatigue. Based on previous damage model [16], corrosionfatigue nonlinear damage model is presented in this paper, which contains one material constant; the inverse slope (α) of the S-N curve. Six specimens of two levels loading of composite material were used to verify the present model; the results showed that the predicted life is in good agreement with the experimental results.

show abstract

Fatigue of polymer composites: Life prediction and environmental effects

Cited by 2 publications

References 31 publications

Preparation of Polypropylene Composites with High Levels of Coir Short Fiber for Use in Products by Injection

Preparation of Polypropylene Composites with High Levels of Coir Short Fiber for Use in Products by Injection

Applying Non-linear Damage Model for Predicating Corrosion Effect on Fatigue Life of (carbon + glass) Fibers / PMMA Composite

Contact Info

Product

Resources

About