Static and fatigue behaviors of short glass fiber–reinforced polypropylene composites aged in a wet environment

Abstract

In this paper, a new experimental study of the bending static and fatigue behaviors of a composite material reinforced with 40% by mass of short glass fibers (type E) and polypropylene matrix is presented. The composite material is obtained in the form of plates by an injection process, which inevitably affects the distribution of the fibers and therefore the behavior of the material studied. To do this, several techniques are implemented on specimens by cutting them in transverse and longitudinal directions. The effect of aging in distilled water at 40℃ on the mechanical characteristics is studied under static and fatigue loading conditions. The static tests, three-point flexure up to failure, allow us to choose the levels of stress for the fatigue tests. The endurance curves as a function of the number of cycles are plotted by adapting the end-of-test criteria N5, N10, and N20, which represent a rigidity drop of 5%, 10%, and 20%, respectively. An interpretation of the Wöhler curve equations defined for the end-of-test criteria allows defining the kinetics of material damage. The results highlighted the influence of distilled water on the mechanical behavior and the lifetime of the material. We also perform macroscopic observations of fracture and microscopic facies in order to identify the damage mechanisms of the composite material.

Effect of seawater aging on the erosive wear response of aramid fiber reinforced composites

“…These curves present the typical behavior of the law of Fick for moisture absorption in polymers. 35 The image shows that the HFRP samples absorb 1.56% of water while the GFRP 0.78% and the CFRP 0.86% in the saturation stage. That is, HFRP samples absorb approximately 100% more water than the other laminates.…”

Fatigue Damage Assessment and Lifetime Prediction of Short Fiber Reinforced Polymer Composites—A Review

“…Sieberer et al have shown [79] the possibility of approximating the data on stiffness reduction and fatigue damage accumulation in a reference sample on real products. Mansouri et al have used stiffness reduction of SFRPs to investigate the fatigue damage kinetics, combining it with both macroscopic observation of cracks and microscopic examination of interfaces to determine damage mechanisms [80]. Table 3 presents some summarized data on stiffness reduction measurement methods for the fatigue assessment, the informative parameters, and the compositions of the examined SFRPs.…”

Inelastic Behavior of Polyoxymethylene for Wide Strain Rate and Temperature Ranges: Constitutive Modeling and Identification

“…POM is frequently used in metal-plastic joints; for example, safety-relevant elements for chassis ball joints are made from POM. POM and other thermoplastics are frequently used as matrix materials in composites reinforced by short fibers [2][3][4].…”