Evaluation of the hygroscopic aging and impact effect on CFRP coupons

Golla, Vidya Sagar (2019) Evaluation of the hygroscopic aging and impact effect on CFRP coupons. [Laurea magistrale], Università di Bologna, Corso di Studio in Aerospace engineering / ingegneria aerospaziale [LM-DM270] - Forli', Documento full-text non disponibile
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The usage of carbon fiber reinforced fiber polymer (CFRP) in the aerospace industry provides massive help. Because, they have extraordinary properties like high strength, more stiffness, and even lighter weight. Due to this reason the researchers want to find a deeper analysis of this material and provides crucial information to the aerospace and automobile industries. Among this, one field that we can look keenly in low-velocity impact behavior on CFRP. The main reason for this is because of the widespread nature of these materials. These are extremely sensitive to impact loads. Consequently, there will be an initiation of impact damage and growth which couldn’t identify through a naked eye. This is why it’s named as BVID. Usually, these failures in laminated composites are intra and interlaminar. Due to internal material damage, the life span of the material could decline especially in moisturized atmospheric conditions. This means the problem could relate to hygroscopic aging. Although we have different aging effects that could alter the aging of material hygroscopic aging should also be considered. Because when BVID is made on CFRP this Hygroscopic aging could trigger and reduces the lifespan of the material. Based on this problem the numerical and experimental investigation tells one common is the reason for this effect of aging is the thickness of the material. Because the main cause for the effect of thickness is resin and water absorption. The glass temperature (i.e 70 degrees) allows the resin properties such as physical and chemical will alter. Since we couldn’t able to see the internal damage caused by LVID (i.e 3J) we can able to estimate the damage in the internal layers of fibers by using a simulation ANSYS software. To understand these simulations are made due to the central impact. In addition to these results could even alter by the position of the impact damage. Which means the impact would be at the center of the coupon or at the near edge.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Golla, Vidya Sagar
Relatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
Impact loading, BVID, Barely Visible Impact Damage, CLC, Combined Load Compression, hydroscopic aging, CFRP, Carbon Fiber Reinforced Polymer, glass temperature, Tg, LVID, Low Velocity Impact Damage
Data di discussione della Tesi
12 Dicembre 2019

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