Fatigue Life and Residual Strength prediction of GFRP Composites: An Experimental and Theoretical approach

Abstract

This paper presents the fatigue behavior of Glass Fiber Reinforced Polymer (GFRP) composites at constant amplitude tension-tension loading conditions. A two parameter residual strength and fatigue life model has been proposed by accounting the effect of stress ratio when the structure undergoes continuous loading. A model is also developed to predict the fatigue life of GFRP composites based on fatigue endurance limit. Experiments were conducted on GFRP composite specimens to predict fatigue life and residual strength at various stress levels. Tests were also conducted to gain an understanding of the tensile behavior of GFRP composite specimens under different quasistatic strain rates. The lowest tensile strength resulting from strain rate studies has been used ultimately for conducting fatigue life and residual strength tests. Reliability of the proposed models has been verified with experimental results and with the models seen in literature.

Recycling of Residual Polymers Reinforced with Natural Fibers as a Sustainable Alternative: A Review

“…In accordance with the above, natural fibers are widely used for their easy accessibility, renewability, nontoxicity, low-density (1.25-1.5 g/cm 3 ), cost reduction, biodegradability, and satisfactory mechanical properties, making them an ecological alternative to replace glass and carbon fibers with densities of 2.54 y 2.1 g/cm 3 [6,8,10,11], respectively, which means that they can be highly competitive, because they allow for the design of lightweight materials.…”

“…Natural fibers when used as reinforcements in biocomposites, in addition to representing environmental benefits, reduction in energy consumption, insulation properties and acoustic absorption [53,54], also have essential mechanical properties, as evidenced in Table 3, with average variations ranging from 1.25-1.5 g/cm 3 for density, 320-520 Mpa for tensile strength, 22-48 Gpa for tensile modulus, and 7-25% for elongation before break; additionally, the investigations of Nurazzi et al [10], Nagaraj et al [55], and others related flexural strength, modulus of elasticity, thickness swelling, and water absorption as important properties when evaluating them as polymeric reinforcements. The mechanical properties in natural fibers are lower than in synthetic fibers; they can be improved or equalized by surface modification techniques [1] (as presented below), in addition to the low density, which is one of the properties that makes them more attractive for different purposes and engineering applications, such as in construction, aeronautics, and automobiles [64,65].…”

“…The use of more efficient biocomposites made from natural fibers and residual polymers in order to replace synthetic reinforcements has become a globally accepted alternative in various applications [1][2][3], due to their multiple advantages in some physical propertiesmechanical and thermal [4][5][6][7]-added to the ecological contribution conferred by the use of residual materials with good yields.…”

Fatigue performance investigation of perforated and bolted pultruded glass fiber reinforced polymer laminates based on experiment and digital images

“…C. Ganesan et al proposed a two-parameter fatigue life model based on the stress ratio and residual strength serving as the independent variables. 22 Then Wahid Ferdous et al conducted an experiment and derived a residual strength-based fatigue life model considering the stress level, stress concentration, and frequency. 23 These theories are capable of explicit expression and are easy to operate by numeric simulations.…”

“…Ganesan et al established a two-parameter residual strength and fatigue life model of the structure by considering the influence of stress ratio of the structure under continuous loading. 22 The fatigue life prediction model of GFRP composites based on residual strength is developed. The model can be written as equation (3):…”