Aljaž Litrop (Author), Jernej Klemenc (Author), Marko Nagode (Author), Domen Šeruga (Author)

Abstract

The objective of the present paper is to investigate the optimization of the existing sheet metal specimen geometry and the optimization of fixtures for fatigue shear tests. Simple static shear tests are used for the material characterization of sheet metal and composite materials. It is well known that it is difficult to achieve pure shear conditions in the specimens because of stress concentrations. Moreover, buckling must be prevented during cyclic tensile and compressive loads, which can be achieved with suitable fixtures. This paper proposes a symmetric specimen geometry for alternating in-plane loads, where the location of crack initiation is predicted and stress concentration is minimized. The design of the geometry was supported with numerical simulations. According to the final specimen geometry, unique fixtures were developed, based in part on the standard ASTM D7078, Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method, solution. The fixtures allow operation at elevated temperatures, easy specimen change, universal use on different test rigs, and possible extension to other specimen shapes. By the proposed fixture system, any type of cyclic test can be performed (i.e., alternating, pulsating, or variable). The fixtures are suitable for measuring strain with mechanical extensometers, video extensometers, or digital image correlation. The experimental shear tests on aluminum 6061 specimens showed comparable shear strain fields as calculated by the finite element method.

Keywords

fatigue;shear;optimisation;fixture systems;digital image correlation method;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 620.178:004.3
COBISS: 106633987 Link will open in a new window
ISSN: 0090-3973
Views: 210
Downloads: 38
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: utrujanje;strig;optimizacija;vpenjalne naprave;metoda digitalne korelacije slik;
Type (COBISS): Article
Embargo end date (OpenAIRE): 2023-04-04
Pages: str. 2345-2357
Volume: ǂVol. ǂ50
Issue: ǂiss. ǂ5
Chronology: 2022
DOI: 10.1520/JTE20210681
ID: 15219909