Abstract
Short glass fiber-reinforced (SGFR) thermoplastics are used in many industries manufactured by injection molding which is the most common technique for polymeric parts production. Glass fibers are commonly used as the reinforced material with thermoplastics and injection molding. In this paper, a critical plane-based fatigue damage model is proposed for tension–tension or tension–compression fatigue life prediction of SGFR thermoplastics considering fiber orientation and mean stress effects. Temperature and frequency effects were also included by applying the proposed damage model into a general fatigue model. Model predictions are presented and discussed by comparing with the experimental data from the literature.
Highlights
Short glass fiber-reinforced (SGFR) thermoplastics have been gaining more attention in many industries during recent decades
Uniaxial fatigue data of short glass fiber thermoplastics from the literature were used in this paper and a critical plane-based damage parameter is proposed to account for fiber orientation and mean stress effects
A critical plane damage model is presented in this study for uniaxial life predictions of reinforced short glass fiber thermoplastics based on the observed damage mechanisms of short glass fiber polymer composites
Summary
Short glass fiber-reinforced (SGFR) thermoplastics have been gaining more attention in many industries during recent decades. Short glass fiber-reinforced polymer matrix composites can be made of thermosets or thermoplastics. Thermoplastics mechanical properties are usually enhanced with short, discontinuous fibers, while thermosets are filled with long, continuous fibers. It is possible to use polymeric composites in structural and load bearing applications, for example in the automotive industry to reduce automobile weight, typically with injection molding manufacturing technique. Short fiber polymeric composites injection-molded to complex geometries at a very high production rate are very attractive to the automotive industry. Uniaxial fatigue data sets from literature for injectionmolded SGFR thermoplastics with oriented fibers were used as illustrative examples in this study in order to evaluate the applicability of the proposed damage model and accounting for the aforementioned effects
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