Abstract
This paper introduces a stiffness reduction based model developed by the authors to characterize accumulative fatigue damage in unidirectional plies and (0/θ/0) composite laminates in fiber reinforced polymer (FRP) composite laminates. The proposed damage detection model is developed based on a damage evolution mechanism, including crack initiation and crack damage progress in matrix, matrix-fiber interface and fibers. Research result demonstrates that the corresponding stiffness of unidirectional composite laminates is reduced as the number of loading cycles progresses. First, three common models in literatures are presented and compared. Tensile viscosity, Young’s modulus and ultimate tensile stress of composites are incorporated as key factors in this model and are modified in accordance with temperature. Four types of FRP composite property parameters, including Carbon Fiber Reinforced Polymer (CFRP), Aramid Fiber Reinforced Polymer (AFRP), Glass Fiber Reinforced Polymer (GFRP), and Basalt Fiber Reinforced Polymer (BFRP), are considered in this research, and a comparative parameter study of FRP unidirectional composite laminates with different off-angle plies using control variate method are discussed. It is concluded that the relationship between the drop in stiffness and the number of cycles also shows three different regions, following the mechanism of damage of FRP composites and the matrix is the dominant factor determined by temperature, while fiber strength is the dominant factor that determine the reliability of composite.
Highlights
In recent years, fiber reinforced polymer composites have received rapidly increasing attention and application in structural systems
Stiffness reduction based mechanisms in composite laminates have been investigated [Praveen and Reddy (1995)] and an algorithm for progressive damage simulation for performance evaluation of Glass Fiber Reinforced Polymer (GFRP) composites under cyclic loads for material constitutive model and model validation has been introduced in the literature [Eliopoulos and Philippidis (2011a, 2011b)]
6 The analysis model of fatigue damage for fibre reinforced polymer (FRP) composite laminates
Summary
Fiber reinforced polymer composites have received rapidly increasing attention and application in structural systems. In other studies related to the damage detection and prediction, a finite element pipeline model was developed for the case when the pipeline was under the coupled structuralthermal-electrostatic field This model was utilized to investigate a case involving the damage identification of carbon fiber-reinforced polymer (CFRP) composite piping systems. A stiffness reduction damage model was presented that characterized the fatigue damage of 0° and 90° unidirectional plies and its extension to (0°, 90°) FRP composite systems This approach took into account the effects of the magnitude of cyclic stress, off-axis angle, mean stress and matrix-fiber bonding strength with respect to the cycles of applied stress [Varvani-Farahani and Shirazi (2007)]. As a follow up to the aforementioned research, this paper makes a detailed comparative study on the accumulative fatigue-damage model for different types of FRP laminates by considering the effect of temperature
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