Use of multi-material systems based on fiber-reinforced composites and metal inserts, for instance in many structural components, can lead to numerous technical advantages such as a weight reduction of 40% in the case of vehicles. Known the fiber reinforced composite materials properties, their use in the production process in substitution of metallic materials could be much more rapid knowing the trend of their mechanical properties degradation due to aging caused by environmental conditions even extreme. In this regard accelerated-aging tests may be help to estimate potential long-term serviceability of material systems under expected conditions of use. This paper describeactivities carried out at Materials Technologies Laboratory of ENEA Trisaia Research Centre and results of accelerated aging tests in climatic chambers to characterize carbon and glass fiber reinforced composites for use in automotive sector cith reference to tensile strenght variation. Three climatic zones have been considered for aging tests: temperate, polar, tropical one, each with different values of thermal excursion and relative humidity in order to simulate extreme conditions to which materials may be subjected in their life cycle. The lenght of aging cycles, related to the values of thermal excursions inserted, have reproduced a real-life period of approximately twenty years. The tested samples were characterized by different matrix: polyamide (PA), polyphthalamide (PPA), PA66 nylon, and were reinforcede with class fiber (long and short) and carbon fiber (long and short). All tensile tersts have been performed according to UNI EN ISO 527: 2012 and resukts have been analyzed to identify which FRP had the best performance according to the considered climates Lastly, having a large number of experimental dta resulting from aging test, starting from the fourth step the reaults have been also analyzed using a statistical approach trying to identify a predictive model.

Evaluation by aging cycles of tensile strenghts and durability characteristics of materials reinforced by carbon and glass fiber

De Fazio, Piero;Bernardo, Franco;Arleo, Giuseppe;Alba, Maria Bruna
2015-07-19

Abstract

Use of multi-material systems based on fiber-reinforced composites and metal inserts, for instance in many structural components, can lead to numerous technical advantages such as a weight reduction of 40% in the case of vehicles. Known the fiber reinforced composite materials properties, their use in the production process in substitution of metallic materials could be much more rapid knowing the trend of their mechanical properties degradation due to aging caused by environmental conditions even extreme. In this regard accelerated-aging tests may be help to estimate potential long-term serviceability of material systems under expected conditions of use. This paper describeactivities carried out at Materials Technologies Laboratory of ENEA Trisaia Research Centre and results of accelerated aging tests in climatic chambers to characterize carbon and glass fiber reinforced composites for use in automotive sector cith reference to tensile strenght variation. Three climatic zones have been considered for aging tests: temperate, polar, tropical one, each with different values of thermal excursion and relative humidity in order to simulate extreme conditions to which materials may be subjected in their life cycle. The lenght of aging cycles, related to the values of thermal excursions inserted, have reproduced a real-life period of approximately twenty years. The tested samples were characterized by different matrix: polyamide (PA), polyphthalamide (PPA), PA66 nylon, and were reinforcede with class fiber (long and short) and carbon fiber (long and short). All tensile tersts have been performed according to UNI EN ISO 527: 2012 and resukts have been analyzed to identify which FRP had the best performance according to the considered climates Lastly, having a large number of experimental dta resulting from aging test, starting from the fourth step the reaults have been also analyzed using a statistical approach trying to identify a predictive model.
glass fiber reinforced composite;Carbon fiber reinforced composites;aging test;regression model;tensile strength
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/5338
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