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Fatigue testing devices in a complex load condition

Dudek A., Papacz W.

Archives of Materials Science and Engineering

2019

Vol. 95, nr 1

20--30

Purpose: The article presents an overview of fatigue testing devices for polymer composites in a complex load condition. This paper presents physically existing devices and which are in the design phase. Also presented are own concepts of the construction of such devices. The analysis of each device was completed with a description of its advantages and disadvantages. There are various constructor approaches to the problem of fatigue testing. The choice of the device depends on the research program adopted for implementation. Design/methodology/approach: The article presents the comparative analysis of individual devices. The authors presented their own proprietary designs of machines for fatigue tests in a complex load condition. Findings: It was found that the selection of the machine should provide restoration of real working reconstruction of the tested object. Originality/value: Specialist research machines are very expensive. Knowledge about technical solutions and potential capabilities of fatigue testing machines, and about the availability of such devices, allows for the best adjustment of the research program and the optimization of their costs. For designers of new machines, the submitted compendium of solutions may provide inspiration for improvements in the own constructions of subsequent generations of such devices.

Tarcie obrotowe w połączeniach zakładkowych na sworznie w złożonym stanie obciążenia

Swierczyna S., Wuwer W.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2011

z. 58, nr 1

353-362

The paper presents the calculation model of any single-cut lap-joint, extended - in relation to up to now considered one by authors - about values of torsional moments. Torsional moments result from journal friction occurring in the axis of every bolt in the joint which is simultaneously bended and sheared. The modified analytical model has been verified experimentally on the example of eccentrically loaded 3- and 4-bolts joints, where walls of cold formed sections were connected by means of blind bolts of the type BOM R16. Experimental and numerical results are compared on the diagrams of relationship occurring between moment M bending the connection and angle of mutual rotation phi/J of joined walls. Values of stiffnesses of a 3-bolt joint according to EC3 determined on the basis of initial stiffness Sj.ini and by means of component method were compared.