Wyniki wyszukiwania - Biblioteka Nauki

1

What if they are not weld-able?

100%

Zhang H. , Jayatissa A. H. , Durbin S. , Ma G.

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tom Vol. 3, No. 3

86-91

EN

Many light metals, such as aluminum and magnesium alloys, are promised to provide significant weight reduction for automobiles. However, the difficulties in welding these metals seriously hinder their large-scale applications. A new, hybrid mechanical joining process is proposed to avoid the inherited metallurgical complications in welding. By spinning and pressing a solid rivet into the metals, a joint is formed with the locking from the rivet, a stirred/mixed zone around the rivet, and solid bonding at the faying interface. This riveting process combines the actions of friction-stir welding in which metals of difierent sheets are mechanically mixed, and self-piercing riveting process which embeds a rivet in the sheets. Experiments have shown that such a friction-stir riveting process can produce joints of comparable strength to those created by other joining means, and can be applied to dififcult-to-weld metals and dissimilar metals, such as aluminum-to-aluminum, magnesium-to-magnesium, and aluminum-to-magnesium.

2

Analiza porównawcza kosztów operacji klejenia i nitowania.

86%

Kuczmaszewski J. , Rudawska A.

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tom nr 4

23-25

3

Experimental investigation into the tensile strength post-repair on damaged aluminium 2024 - T3 plates using hybrid bonding/riveting

86%

Merah A. A. , Houari A. , Madani K. , Belhouari M. , Amroune S. , Chellil A. , Yahia C. Z. , Campilho R. D. S. G.

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tom Vol. 18, no. 3

514--525

EN

Since the implementation of repair processes by composite patch bonding, this process has consistently demonstrated high performance across various industrial sectors, especially in the fields of aeronautics, aerospace and civil engineering. Consequently, there are situations in which the riveting process becomes the sole solution, particularly when the structure is subjected to severe mechanical or thermo-mechanical stresses, since adhesives have low mechanical strength after aging. Each method has its own set of advantages and disadvantages. The current trend is to combine these two processes to minimise their drawbacks as much as possible. The objective of this work is to present an experimental study on the repair of an aluminium plate AL2024-T3 with a central circular notch using a patch of different nature (metal or composite), under tensile loading conditions. The repair composite considered is a carbon/epoxide. The results of the tensile tests showed that the repair by the combination of the two processes improves the mechanical strength of the damaged structure. A comparison of the results of the experimental curves obtained on riveted, bonded and hybrid assemblies has been taken into consideration.

4

Analiza wpływu technologii nitowania na stan przemieszczeń, odkształceń i naprężeń wokół nitu

72%

Jachimowicz J. , Szymczyk E. , Sławiński G.

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tom R. 81, nr 4

332-337

PL

Przedstawiono wyniki obliczeń numerycznych, które pokazują wpływ czynników technologicznych na proces nitowania.

EN

Presented are the results of numeric calculations to demonstrate the effect of the process features on riveting operation.

5

Właściwości materiałowe nitów ze stali S355J2+C w świetle badań laboratoryjnych

72%

Jasiński W.

Dozór Techniczny

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2016

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tom z. 6

12--17

PL

Wzrost zastosowania wysoko wytrzymałych stali w konstrukcjach stalowych wymusił zastosowanie technik łączenia, np. nitowania i połączeń kołkowo-śrubowych. Efekt cieplny procesu spawania doprowadza do znacznego obniżenia właściwości wytrzymałościowych złącza spawanego stali obrobionych cieplnie. Ponadto połączenia nitowane stanowią element dekoracyjny w realizowanych nowych konstrukcjach stalowych. Połączenia kołkowo-śrubowe stosowane są w pracach remontowych konstrukcji stalowych. Zalecane jest stosowanie łączników z materiałów o składzie i właściwosciach zblizonych do łączonych materiałów. W przypadku nitowania na gorąco właściwości materiału nitu ulegają zmianie w wyniku przemian fazowych w procesie nagrzewania do 950-1000°C i chłodzenia w trakcie zakuwania łba nitu. W pracy przedstawiono wyniki analizy zmian właściwości materiału nitu po normalizowaniu i zakuwaniu w stosunku do stanu dostawy.

6

Comparison finite element analysis on duralium strength against multistage artificial aging process

72%

Tsamroh D. I.

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tom Vol. 109, nr 1

29--34

EN

Purpose: To analyze and estimate the strength of duralium rivets which had been treated by using multistage artificial aging compared with duralium that had not been treated. This processwas necessary to be conducted in riveting process effectively. Duralium has been widely used in aerospace industry, one of duralium usage in aerospace industry is aircraft fittings such as rivet. Riveting is one of method that used for joining airframe structural components. During riveting process, the load transfer causing stress that led to the fatigue. Riveting process also causes deformation on the rivet and sheet metal. Deformation that occurs on the rivet will affect the performance of rivet structure. Thus, duralium rivet was analyzed its total deformation, shear stress, and its equivalent stress Von Misses. Design/methodology/approach: that used in this study was finite element analysis. Geometry of rivet that used in this study was drawn by using Autodesk Inventor Professional 2018. While total deformation, shear stress and equivalent stress Von Mises on duralium rivets were found out by using ANSYS Workbench 18.1. Findings: Comparison result was obtained between duralium rivet with and without treatment of multistage artificial aging. The result shown that total deformation, shear stress and equivalent stress Von Mises which obtained by duralium rivet with multistage artificial aging had the lower value than duralium rivet without multistage artificial aging. Duralium rivet with multistage artificial aging could be used as aircraft fitting which had the higher strength. Research limitations/implications: Direct experiment on duralium rivet had not been done yet, this study only did simulation based on data that obtained form previous research that had been conducted by the researcher. Practical implications: Duralium rivet with multistage artificial aging had lower value on total deformation, shear stress, and equivalent stress Von Misses, thus duralium rivet with multistage aritificial aging had a higher strength. Originality/value: Application of duralium as a rivet with treatment of multistage artificial aging.

7

Modelowanie i analiza MES technologicznego procesu nitowania pokryć lotniczych

58%

Szymczyk E. , Jachimowicz J. , Sławiński G. , Derewońko A.

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2008

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tom R. 49/2, nr 4-5

88-94

PL

Połączenia nitowe są nadał szeroko stosowane w przemyśle lotniczym. O stanie połączenia decyduje nie tylko obciążenie eksploatacyjne, ale również sposób jego wykonania. Dlatego należy uwzględnić wypływ czynników konstrukcyjnych, materiałowych a przede wszystkim technologicznych na wytrzymałość połączenia. Przedstawiono trzy warianty symulacji zakuwania na prasie nitu grzybkowego w celu wyznaczenia rozkładów oraz wartości naprężeń wstępnych w połączeniu nitowym, a tym sann oceny stopnia wypełnienia otworu nitowego.

EN

The riveted joints are still commonly used in aircraft structures. Manufacturing process as well as service load has an important influence on the strength of the joint The effect of the design, material and rivet manufacturing factors on fatigue performance of the riveted joint should be considered. Three cases of simulation of the riveting process are presented in the paper. The stress and strain states around the rivet hole after riveting are compared.