Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: hybrid adhesive-rivet joint

Sortuj według:

Ogranicz wyniki do:

Impact strength of hybrid joints

Godzimirski Jan, Komorek Andrzej

Technologia i Automatyzacja Montażu

2022

nr 3

3--9

Hybrid adhesive-mechanical joints compared to only adhesive or only mechanical joints are characterized by many advantages: greater stiffness, greater static strength, greater fatigue life, higher reliability, corrosion resistance. For these reasons, they are eagerly used in aviation structures. The aim of the research was to check the influence of hybridization on the impact toughness of connections. The static strength and the energy of dynamic destruction of lap joints loaded in shear by stretching or bending were compared: adhesive, riveted and hybrid joints. The tested hybrid joints were characterized by higher strength and dynamic destruction energy compared to adhesively bonded or riveted samples. The research also shows that the energy of dynamic failure increases if the failure of the joint is not complete and causes the connected elements to rotate around one rivet.

Połączenia hybrydowe klejowo-mechaniczne w porównaniu do połączeń tylko adhezyjnych czy tylko mechanicznych charakteryzuje wiele zalet: większa sztywność, większa wytrzymałość statyczna, większa trwałość zmęczeniowa, wyższa niezawodność, odporność na korozję. Z tych względów chętnie są stosowane w konstrukcjach lotniczych. Celem prowadzonych badań było sprawdzenie wpływu hybrydyzacji na udarność połączeń. Porównano wytrzymałość statyczną oraz energię niszczenia dynamicznego połączeń zakładkowych obciążonych na ścinanie poprzez rozciąganie lub zginanie: klejowych, nitowych i hybrydowych. Badane połączenia hybrydowe cechowała większa wytrzymałość i energia niszczenia dynamicznego w porównaniu z próbkami klejonymi lub nitowanymi. Z badań wynika również, że energia niszczenia dynamicznego wzrasta, jeśli zniszczenie połączenia nie jest całkowite i powoduje obrót łączonych elementów wokół jednego nitu.

Experimental study of nanocomposite hybrid adhesive-rivet joints

Nabibi Nabard, Ramezani Shadi

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 3

337--365

The wide range of rivets usage goes back to the processes of manufacturing and repairing an aircraft fuselage. When it comes to structural joints, adhesive bonding is said to have some merits which overshadow other joining methods, such as bolting, riveting, and welding. Today, the applications of structural adhesives do not end in aerospace, but they also are ideal for the automotive industry, where the need is to join plates of dissimilar adhesives to produce lightweight car bodies. The hybrid joints also are one of the methods of joining different parts of the machine in a durable way in which some benefits such as the significant tensile strength, the dissipated energy, and higher reliability during long-term working stand out. In this research, the effect of rivets layout on strength and failure of nanocomposite rivet and hybrid adhesive-rivet joints through two experimental and numerical methods was evaluated. Also, using the artificial neural networks method, force–displacement curves for specimens were obtained. The results of the experimental tests and the finite element analysis showed that as the number of rivets increased in the joint of the nanocomposite components, the strength of the joint increased. The layout of the rivets has a significant effect on the strength of the rivet joint. According to the performed experiments for achieving the efficient strength in the hybrid joints for the nanocomposite plates, since the strength of the adhesive is very effective, adhesive selection and the appropriate number of rivets are the key factors. The fracture modes in the internal plates of nanocomposite joints (adhesive, rivet, and adhesive-rivet joints) were observed as follows: net-tension, bearing, shear-out, crack propagation, tearing, and shear in adhesive layers. Besides, the numerical model of the work is done using ABAQUS software. The results of software simulation in the numerical model are compatible with the experimental method’s findings. However, the agreement between the results of experimental and neural network methods is higher. Owing to the results of experiments, the polypropylene nanocomposite as well as the appropriate jointing method can be put forward in the structures of the automotive industry.