A New S-N Curve Model of Fiber Reinforced Plastic Composite

Abstract

Based on an amount of fatigue experimental data of fiber reinforced plastic composite, a new three-parameter S-N curve model is proposed to describe the relationships between the loads and fatigue life under constant amplitude cyclic loading. As the logistic curve behaves as sigmoidal which is the similar with previous S-N models, and from this comparability, an S-N equation with logistic’ form has been established. The model can assess the fatigue behaviors of FRP under various loading conditions, such as, tension-tension (T-T), tension-compression (T-C) or compression-compression (C-C) loading under different stress ratios of the whole region of fatigue life. Several examples are employed to illustrate that the model has ability to fit several different sets of experimental data accurately.

Probabilistic S-N fields based on statistical distributions applied to metallic and composite materials: State of the art

“…The logistic S-N curve model was developed by Mu et al 65 through the use of the logistic distribution to describe the fatigue life behavior of composite materials, since this function is very similar to the S shape, commonly observed in S-N curves (natural-logarithm). The logistic distribution adapted to model the S-N curve is given by equation (8)…”

A comparison between S-N Logistic and Kohout-Věchet formulations applied to the fatigue data of old metallic bridges materials

“…The logistic S-N curve model, developed by Mu [16], uses a logistic function to describe fatigue life behavior of composite materials, since this function is very similar to the S shape, commonly observed in S-N curves (lin-log). The logistic function is adapted to model the S-N curve and is given by Eqn.…”

“…This model has been increasingly used in fatigue life assessment of existing bridge structures [6,14,15]. Another model similar to Kohout-Věchet relation is the model proposed by Mu et al [16], in which a multi-slope model capable of adjusting the S-N curve in the three target regions, low-cycle-, finite-life-and high-cycle-fatigue, using a logistic function of three parameters is proposed. T However, the analysis of Mu's work was limited to testing the model only for the T300/QY8911 carbon/epoxy composite.…”

Construction engineering

“…Mu, Wan, and Zhao (2011) proposed a multislope model comprising three parameters for modeling the fatigue behavior of composite materials. However, they require more data in all the examined life regions because they are only fitting equations that simulate material behavior by adjusting a number of fitting parameters.…”