scholarly journals Directing the Material Flow and Form Filling through a Multi-axis Forming Process

2021 ◽  
Author(s):  
Birk Wonnenberg ◽  
Felix Gabriel ◽  
Klaus Dröder
Keyword(s):  
Material Properties ◽  
Material Flow ◽  
Motion Path ◽  
Work Piece ◽  
Forming Process ◽  
Local Material ◽  
Standard Linear ◽  
Tool Motion ◽  
Six Degree Of Freedom ◽  
Local Material Properties

Multi-axis forming is a six degree of freedom forming process. This process influences actively the material flow by defining a six dimensional tool motion path and the corresponding tool velocity. Within this process, it is possible to combine a linear forming movement followed by a rolling movement and therefore tailor the induced local material properties of the work piece. The research objective of this work is to observe and quantify the interaction between tool motion and material flow for the purpose of process planning. Experiments are conducted to examine the horizontal material flow within a multi-axis forming process of a plane L-shaped work piece. Three different punches form the material: Flat, cylindrical and cone-shaped. The horizontal material flow is recorded through a transparent die by a camera to measure the material flow for different tool motions. It is shown, that a multi-axis forming process can adjust the local material flow. The resulting redirection of the material flow after the sharp inward facing edge of the L-shape is analyzed and compared. With a smaller active zone compared to a standard linear pressing, the multi-axis forming forces are reduced. In addition, the reservoir with the remaining material is more concentrated. Finally, it is possible to direct the material flow with the punch motion, which can be used to determine local part properties.

scholarly journals Bending tests on GLT beams having well-known local material properties

2014 ◽  
Vol 48 (11) ◽  
pp. 3571-3584 ◽  
Author(s):  
Gerhard Fink ◽  
Andrea Frangi ◽  
Jochen Kohler
Keyword(s):  
Material Properties ◽  
Bending Tests ◽  
Local Material ◽  
Local Material Properties

A Description of Local Material Properties Close to a Butt Weld

2013 ◽  
Vol 586 ◽  
pp. 146-149
Author(s):  
Pavel Hutař ◽  
Martin Ševčík ◽  
Ralf Lach ◽  
Zdeněk Knésl ◽  
Luboš Náhlík ◽  
...  
Keyword(s):  
Stress Intensity Factor ◽  
Material Properties ◽  
Radial Crack ◽  
Welded Joint ◽  
Butt Weld ◽  
Pipe System ◽  
Local Material ◽  
Mechanics Analysis ◽  
Welding Procedure ◽  
Local Material Properties

The paper presents a methodology for the lifetime assessment of welded polymer pipes. A fracture mechanics analysis of a butt-welded joint is performed by simulating radial crack growth in the nonhomogenous region of the pipe weld. It was found that the presence of material nonhomogeneity in the pipe weld caused by the welding procedure leads to an increase in the stress intensity factor of the radial crack and changes the usual failure mode of the pipe system. This can lead to a significant reduction in the lifetime of the pipe system.

Evaluation of Local Material Flow during Complex Deformation Conditions on the Basis of Multi Scale Analysis

2016 ◽  
Vol 682 ◽  
pp. 350-355
Author(s):  
Joanna Szyndler ◽  
Lukasz Madej
Keyword(s):  
Material Flow ◽  
Incremental Forming ◽  
Material Behavior ◽  
Scale Analysis ◽  
Forming Process ◽  
Complex Deformation ◽  
Multi Scale ◽  
Local Material ◽  
Scale Levels ◽  
Digital Material

Development of the multiscale numerical model of innovative incremental forming process, dedicated for manufacturing complex components for the aerospace industry is the main aim of the work. Description of the incremental forming concept based on division of large die into a series of small anvils subsequently pressed into the material is presented within the paper. Particular attention is put on material behavior at both, macro and micro scale levels, respectively. A Finite Element Method (FEM) supported by Digital Material Representation (DMR) concept was used during the investigation. Results in the form of strain distributions and shapes of grains obtained from different sample areas after incremental forming process are presented within the paper.

scholarly journals Combining adhesive contact mechanics with a viscoelastic material model to probe local material properties by AFM

Soft Matter ◽  
2018 ◽  
Vol 14 (1) ◽  
pp. 140-150 ◽  
Author(s):  
Christian Ganser ◽  
Caterina Czibula ◽  
Daniel Tscharnuter ◽  
Thomas Schöberl ◽  
Christian Teichert ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Atomic Force Microscopy ◽  
Viscoelastic Material ◽  
Material Properties ◽  
Material Model ◽  
Adhesive Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Local Material ◽  
Local Material Properties

We present an atomic force microscopy based method to study viscoelastic material properties at low indentation depths with non-negligible adhesion and surface roughness.

A methodology to consider local material properties in structural optimization

2016 ◽  
Vol 231 (15) ◽  
pp. 2822-2834 ◽  
Author(s):  
Riccardo Cenni ◽  
Matteo Cova ◽  
Giacomo Bertuzzi
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Cast Iron ◽  
Shape Optimization ◽  
Material Properties ◽  
Simulation Software ◽  
Optimization Techniques ◽  
Local Material ◽  
Local Strength ◽  
Local Material Properties

We propose a finite element methodology to consider local material properties for large cast iron components in shape optimization. We found that considering local strength instead of uniform strength within shape optimization brings to different results in terms of safety-cost balance for the same component. It is well known that local mechanical properties of large cast iron components are defined by their microstructure and defects, which locally affect the strength of the components. Considering or not local mechanical properties can dramatically change a component reliability evaluation during its design. Since a typical industrial aim for shape optimization is trying to get the optimal solution in terms of component quality and cost, considering local material properties is even more important than in traditional design process where no optimization techniques are used. We compute solidification process parameters via finite element solidification analysis, and then we exploit experimental correlation between these parameters and ultimate tensile strength to evaluate the local reliability of the finished component under its static loading conditions. We believe that this methodology represents an opportunity to better design casting components when mechanical properties are deeply affected by their production process as described in the provided examples. In these examples, we wanted to minimize casting cost constrained by a target reliability and we get component cost reduction by considering local material properties. Future research will address the problem of using dedicated casting simulation software instead of general purpose finite element analysis software to compute solidification analysis and then introducing fatigue analysis and correlation between fatigue material properties and casting process output variables.

Low Heat Joining – Manufacture and Fatigue of Soldered Locally Strengthened Structures

2007 ◽  
Vol 22 ◽  
pp. 101-111
Author(s):  
Alfons Esderts ◽  
Volker Wesling ◽  
Rainer Masendorf ◽  
A. Schram ◽  
Tim Medhurst
Keyword(s):  
Fatigue Life ◽  
Material Properties ◽  
High Strength ◽  
Local Material ◽  
Process Reliability ◽  
Low Distortion ◽  
Local Material Properties ◽  
Joining Process

The advantages of low heat joining techniques, such as low distortion and little influence on the local material properties due to the low introduced amount of heat, shall be made usable for the manufacture of high strength structures by increasing the process reliability. The dependency between the parameters of the joining process, the seam geometry, the type of solder, the load type und the fatigue life especially of soldered structure with local strengthening shall be examined to allow a calculative estimation of the part’s life.

Ontology-Based Approach to Transform Fatigue Properties of Branched Sheet Metal Products for Use in Algorithm-Based Product Development

2008 ◽  
Author(s):  
Nils Hirsch ◽  
Herbert Birkhofer ◽  
Volker Landersheim ◽  
Holger Hanselka ◽  
Ute Gu¨nther ◽  
...  
Keyword(s):  
Material Properties ◽  
Mathematical Optimization ◽  
Fatigue Properties ◽  
Continuous Manufacturing ◽  
Linear Flow ◽  
Simplified Approach ◽  
Local Material ◽  
Flow Splitting ◽  
Fatigue Evaluation ◽  
Local Material Properties

In order to shorten the design process of a multi-chambered profile, it is important to integrate the Technological Findings of the production and the evaluation of the manufactured product in a structured and systematic way, providing mathematical optimization. The development of profiles exposed to cyclic mechanical loading has to take into consideration their fatigue properties. This paper proposes a classification structure of the existing Technological Findings of Linear Flow Splitting and the continuous manufacturing line. The classification is realized by an ontology, modeling the manufacturing processes, machines, the geometry of the semi-finished product, sub-processes, engaged machine components and specific conditions for the employed material. A profile manufactured by linear flow splitting is subject to severe changes of local material properties. This affects the fatigue properties of the profile. The paper focuses on preparing the integration of these fatigue properties in a simplified approach into the mathematical optimization. The approach is developed by modeling examples of profiles with different material properties by methods of mathematical optimization. The examples are applied to a numerical fatigue evaluation. Results and conclusions drawn of this analysis are incorporated in the ontology as data and rules, serving as an input for the optimization.

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