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1

Influence of Hole Chamfer Size on Strength of Blind Riveted Joints

Lubas Monika, Witek Lucjan

Advances in Science and Technology. Research Journal

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2021

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Vol. 15, no 2

49--56

EN

This work presents the results of the strength analysis of single lap riveted joints. In experimental investigations, performed in this paper, the blind rivet was considered. Blind riveted joints are very popular and often used in many branches as aerospace or automotive. In scientific publications is a research gap related to the strength analysis and failure mechanisms of the blind riveted joints. There are many geometrical parameters of riveted joints that have influence on strength parameters of the joint. One of them is the size of the chamfer located on the edge of the rivet hole. In this analysis a four different sizes of the hole chamfer were examined. The investigated specimens (sheets and the rivet) were made out of aluminium alloy. The tests of the blind rivet joints were performed with the use of a Zwick-Roell tension machine. As a results of experimental investigations, the ultimate shear load diagrams of joints were obtained. Obtained shear load diagrams showed influence of the hole chamfer size on destructive force of joint. Moreover, for a few joints the static test was interrupted before the damage of rivet. Next, the joints were covered by the epoxy resin. After that, the joints in an advanced stage of rivet deformation were cut and magnified using an optical microscope. Analysis of the rivet axial sections at various stages of deformation is an interesting task from the research point of view. Results obtained in this work contribute to a better understanding of the failure process of blind rivets.

2

Experimental strength analysis of riveted joints using blind rivets

Witek Lucjan, Lubas Monika

Journal of KONES

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2019

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Vol. 26, No. 1

199--206

EN

This article presents results of experimental investigations of the lap blind riveted joint. The main goal of the work is determination of destructive load of the blind riveted joints. The blind rivets were originally used in the aircraft structures where access to both sides of the riveted structure is impossible. Blind rivets are now commonly used in many branches of industry because of their low cost. Moreover, the riveting process is uncomplicated. There are many publications about analysis of strength of solid rivets in the research literature. However, the strength analysis of the blind rivets was rarely undertaken. There is the research gap in the analysis of both the strength and the load capacity of blind riveted joints. The influence of selected geometrical parameters of the joint on the stress distribution and the destructive force was not widely described in literature. The first part of the work presents a review of standards and publications related to stress and strength analysis of blind riveted joints. The next part of the study describes experimental investigations of joints. The examined specimens were made out of AW 2017 aluminum alloy, cut from 1[mm] thick sheet. Investigated blind rivets were made out of aluminum alloy. The lap joint with one rivet and the single row five-rivet joint were investigated. Moreover, the different size of hole chamfer were considered. The experimental tests were performed with the use of Zwick-Roell tension machine. The main results of experimental investigations are ultimate shear load diagrams. The influence of both the hole chamfer and the number of rivets on destructive force and shear diagrams of blind riveted joints were in detail analysed. After shear tests, the fractured rivets were magnified in order to explain the failure phenomenon of blind rivets. In the future research works the obtained results will be used in strength analysis of the blind riveted joints using the finite element method.

3

The structure of the strength of riveted joints determined in the lap joint tensile shear test

Mucha J., Witkowski W.

Acta Mechanica et Automatica

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2015

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Vol. 9, no. 1

44--49

EN

The article presents the analysis of the structure of the load capacity of riveted joints. For the four joining systems the lap joint specimens were made and tested in the shearing test. The joints were prepared for the three combinations of the DC01 steel and EN AW- 5754 aluminium alloy sheets with the thickness of 2mm. On the basis of the obtained load-elongation diagram tensile shear test curves, the basic parameters defined in the ISO/DIS 12996 standard were determined. In the case of the conventional riveted joints the maximum load capacity of the joint is determined by the strength of the fastener. For the joints with aluminium-steel blind rivet , the load capacity of the joint was on the strength limit of the rivet tubular part and on the strength limit of the sheet material. The strength of the SSPR joint is determined by the mechanical properties of the material of the joined sheets. From all sheets and rivet specimens arrangements the highest load capacity of the joint was obtained for the DC01 sheet material joints, and the lowest load capacity of the joint was obtained for the EN AW-5754 sheet material joints.

4

Właściwości kohezyjne wybranych proszków spożywczych

Szulc K., Lenart A.

Inżynieria Rolnicza

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2009

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R. 13, nr 2

169-175

PL

Celem pracy było zbadanie zdolności do płynięcia w teście bezpośredniego ścinania wybranych proszków spożywczych dostępnych na rynku polskim: mleko w proszku, cukier puder, proszek truskawkowy, kaszka ryżowa i kaszka kukurydziana. Zakres pracy obejmował analizę parametrów plastycznego płynięcia oraz analizę składu granulometrycznego i gęstości nasypowej badanej żywności w proszku. Wyznaczona funkcja płynięcia określa badane produkty tj. mleko w proszku, cukier puder, kaszkę kukurydzianą i kaszkę ryżową KR2 jako proszki kohezyjne lub słabo kohezyjne, natomiast proszek truskawkowy i kaszkę ryżową KR1 jako proszki słabo kohezyjne lub niekohezyjne, w zależności od naprężenia konsolidującego.

EN

The purpose of the work was to examine flow capacity in the direct shearing test for selected food powders available in Polish market: powdered milk, powdered sugar, strawberry powder, rice groats and corn groats. The scope of work included analysis of plastic flow parameters and analysis of size distribution and bulk density of examined powdered food. Determined flow function characterises the examined products, that is powdered milk, powdered sugar, corn groats and KR2 rice groats as cohesive or weakly-cohesive powders, while strawberry powder and KR1 rice groats are described as weakly-cohesive or non-cohesive powders, depending on consolidating stress.

5

Opracowanie metodyki określania właściwości mechanicznych na podstawie próby ścinania

Cesarz S.

Prace Instytutu Metalurgii Żelaza

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2008

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T. 60, nr 3

49-50

PL

Celem pracy było opracowanie i wdrożenie nowej metody badań właściwości mechanicznych. W pracy zaprojektowano i wykonano urządzenie do próby ścinania, przeprowadzono badania wytrzymałości na ścinanie, wykonano próby rozciągania i ustalono zależności między wynikami uzyskanymi z obu tych prób.

EN

The purpose of this work was to develop and implement a new method for testing mechanical properties. In the work, the shearing test device was designed and made, shear strength tests and tensile tests were carried, and relationships between the results obtained in both types of the tests were determined.

6

Właściwości płynięcia mąk pszennych

Domian E., Chałat K.

Inżynieria Rolnicza

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2003

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R. 7, nr 8

73--79

PL

W pracy podjęto badania właściwości mechanicznych mąk pszennych w teście jednoosiowego ścinania z uwzględnieniem wpływu naprężenia konsolidującego. Zakres pracy obejmował wyznaczenie parametrów plastycznego płynięcia przy czterech poziomach naprężenia konsolidującego z zakresu 9-18 kPa. Pomiary wykonano dla pięciu rodzajów mąk pszennych: poznańska, tortowa, krupczatka, graham i razowa. Mąki różniły się między sobą składem granulometrycznym oraz chemicznym. Analiza parametrów plastycznego płynięcia uzyskanych z testów jednoosiowego ścinania pozwoliła jednoznacznie scharakteryzować właściwości płynięcia badanych mąk pszennych.

EN

Paper presented the study on mechanical properties of the wheat flours determined at uniaxial shearing tests including the effect of consolidation stress. The experiments aimed at determination of plastic flow parameters at four levels of consolidation stress ranging within 9-18 kPa. The measurements were taken for five kinds of wheat flour: "poznańska" flour, cake flour, pure wheaten flour, graham flour and the whole meal. The flours differd each other with the sieve analysis and chemical composition. The analysis of plastic flow parameters obtained at uniaxial shearing tests enabled to make an univocal characteristics of the flow parameters for tested wheat flours.