Optimierung einer Probenform für den Kreuzzugversuch zur Bestimmung der Grenzformänderung
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David Jocham
, Martin Baumann and Wolfram Volk
Kurzfassung
Der Kreuzzugversuch stellt mit zwei senkrecht aufeinander liegenden Kraftrichtungen eine Möglichkeit zur Abbildung mehrachsiger Spannungszustände in der Materialprüfung dar. Die erreichbare Formänderung ist in Probenmitte der gängigen Kreuzzugproben sehr limitiert, so dass diese lediglich zur Bestimmung von Fließortskurven im ersten Quadranten bei niedrigen Vergleichsformänderungen Anwendung finden. Durch eine Analyse der geometrischen Merkmale gängiger Kreuzzugproben wie Schlitze, Kantenverrundungen und Vertiefungen mit Hilfe der FEM wurde eine Kreuzzugprobe zur Bestimmung der Grenzformänderung unter mehrachsiger Belastung optimiert. Durch geeignete Anordnung und Form der Schlitze sowie einer Vertiefung in Probenmitte werden Formänderungen erreicht, die im Bereich der Grenzformänderungskurve liegen. Weiterhin besteht die Möglichkeit die Probengeometrie durch Kleben einzelner Bleche zu erstellen. Hierdurch können eine spanende Bearbeitung der Probe und die einhergehende Veränderung der Werkstoffeigenschaften im Auswertebereich der Probenform vermieden werden.
Abstract
The biaxial tensile test allows to test materials under multiaxial stress states. The achievable strain in the specimen center of the common crusade samples is very limited. The main application is the identification of the yield loci in the first quadrant at low strain values. To determine the forming limit of metal under multiaxial stress states, an optimization of a specimen geometry took place. The influence on the maximum forming limit of common specimen with geometrical features like slots, rounded edges and indentations were investigated by using FEM analysis. Higher strains up to the forming limit can be achieved by using a suitable positioning and shape of the slots as well as an indentation in specimen center. Furthermore, the specimen geometry can be created by adhesive bonding of single sheets. A machining process and the associated change of material properties in the evaluation area of the specimen can be avoided.
Literatur
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© 2015, Carl Hanser Verlag, München
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- Kalender/Calendar
- Kalender
Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Failure of porcelain coated heating elements used in regenerative air preheaters
- Mechanical characterization by DOE analysis of AA6156-T4 friction stir welded joints in as-welded and post-weld aged condition
- Cold formability of AISI 1020 steel sheets
- Optimierung einer Probenform für den Kreuzzugversuch zur Bestimmung der Grenzformänderung
- Friction weldability of a PA 6 polymer
- A discrete dislocation technique for fatigue microcracks (Part III)
- Flexure behavior of composite cantilevers subjected to different environmental conditions
- Structure investigation of soil aggregates treated with different organic matter using X-ray micro tomography*
- Investigation of the tool effect on the strength of friction stir spot welded aluminum specimens: A comparative study
- Microstructural and mechanical characterization of electric arc furnace (EAF) slag for use as abrasive grit material
- Charring rate of timbers in terms of size, layer material and fire class evaluated by the Taguchi method
- Tribological properties of boronized ferrous based PM journal bearings
- SNMS investigations of thermally sprayed coatings
- Kalender/Calendar
- Kalender