The Effect of Different Environmental Condition on Flexural Strength and Fatigue Behavior of E-Glass/Epoxy Composites
- PDF / 5,753,765 Bytes
- 16 Pages / 595.276 x 790.866 pts Page_size
- 56 Downloads / 171 Views
RESEARCH PAPER
The Effect of Different Environmental Condition on Flexural Strength and Fatigue Behavior of E‑Glass/Epoxy Composites H. Ersen Balcıoğlu1 · Raif Sakin2 · Halit Gün1 Received: 30 October 2019 / Accepted: 24 September 2020 © Shiraz University 2020
Abstract The composite materials exposed to dynamic loads may suffer damage at strength value, which is under own yield strengths. Also, improper environmental conditions accelerate the damage process. In this study, the effect of heavy chemical environments such as acid and alkaline and retaining time for these environments on flexural strength and fatigue behavior of E-glass/ epoxy laminated composites was investigated. In this content, glass/epoxy ( G8) having eight layers was produced by using the hand lay-up method. The produced composite materials were retained into acidic and alkali solution having 5%, 15%, and 25% concentration a period of 1, 2, 3, and 4 months. A computer-controlled fixed-end type fatigue test machine capable of tilting 10 test samples at the same time was designed and manufactured to determine the fatigue behavior of composite samples. Fatigue behavior of glass/epoxy was determined under dynamic flexural load which corresponds to 80%, 70%, 60%, 50%, and 40% of static three-point bending strength of the test sample. SEM image of damaged specimens was taken to describe the failure mechanism of damage which occurs after fatigue. Also, to better understand environmental condition on the fatigue life, results were compared with results of glass/epoxy laminated composites, which were not retained into any environments (0%). Keywords Flexural strength · Flexural fatigue · S–N curves, glass/epoxy · Acid and alkaline environments · Immersion time
1 Introduction Developing production techniques and discoveries in material science have placed composite materials in an important position in the 21st century. Nowadays, composite materials are used as building materials for many products from air, land, and sea vehicles to the construction sector, due to their superior impact and corrosion resistance, high stiffness, and lightness. While static and dynamic strength of the polymer composites for the product catalog is determined, test specimens are generally tested in the laboratory condition. However, if considering the uses of polymer composite materials, they are often exposed to outer environmental influences. Therefore, the effects of factors such as * H. Ersen Balcıoğlu [email protected] 1
Department of Mechanical Engineering, Usak University, Usak, Turkey
Edremit Technical Vocational School of Higher Education, Balikesir University, Edremit, Turkey
2
temperature, humidity, wind, and ambient pH, etc., that will be subjected to, must be taken into account during the design phase. The service life of the construction element, which is designed according to the place of use, must be known in advance and this provides the user with work safety. For this purpose, researchers investigated the behaviors of composite mater
Data Loading...
