نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی واحد الیگودرز
2 دانشکده فنی و مهندسی، مرکز تحقیقات قدر، دانشگاه امام حسین (ع)
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Existence and growth of cracks in structures is an unavoidable matter, and presentation of economical repair methods is useful in this situation. Applications of repaired structures by composite patches are expanding. One of the most significant uses of this method is repairing cracked components and parts of aerospace industries. This type of patch includes many advantages such as high strength, resistance against corrosion and humidity, low weight and acceptable fatigue life. Patch repair causes the stress reduction around the crack and also the transition of stress from the cracked plate to the patch. Finally this type of repair decreases or totally stops the crack growth and increases the fatigue life of parts. In this study, the experimental investigation of crack growth and fatigue life in cracked Aluminum plates repaired by composite patches has been considered. Edge-cracked aluminum plates repaired with one-side composite patches are investigated. Due to avoidance of the disadvantages of mechanical joints such as; stress concentration, low strength against fatigue, the risk of failure in the main body, and so on, the adhesive has been used to join the parts. In addition, the effects of several parameters, such as the prime cracks angle in three levels $0^{0}$, $30^0$, and $45^0$, patch's width in three levels 25, 30, and 35mm and the layer's layout in three levels on fatigue life have been investigated. The results indicate that by the increase in crack angle from 0 to $45^0$, the fatigue life of parts under fatigue loads increases; and in several path layouts, there is not any difference in fatigue life. It is noticeable that increase in the patch's width, does not have any remarkable influence on the fatigue life and even may cause some decrease in lifetime.
کلیدواژهها [English]
)
