Blade cutting of thin walled structures by explicit dynamics finite elements

Blade cutting of thin walled structures by explicit dynamics finite elements In cohesive crack propagation induced by blade cutting, it is necessary to consider the blade radius of curvature as a characteristic length additional to the shell thickness and to the cohesive process zone length, which usually characterize crack propagation in thin walled structures. When the finite element simulation of a blade cutting process is considered, these three lengths need to be properly resolved. The blade radius of curvature can be orders of magnitude smaller than the shell thickness and the cohesive process zone. Furthermore, the transition from a continuous mesh to a mesh containing a crack with a cohesive interface is well known to be critical for solution accuracy. Nodal equilibrium is in general violated during the transition, with subsequent generation of spurious stress oscillations that, in view of the non-reversible nature of the problem, can lead to significant inaccuracies in the stress response. The smallest length, i.e. the blade radius of curvature, is here resolved using the so called directional cohesive element model as in Pagani and Perego (CMAME 285:515–541, 2015), while the structural thickness is modeled using solid-shell elements. The concept of directional cohesive elements is here extended for application to the case of cutting by scissors. As for the cohesive process zone length, different modeling options are discussed in terms of their capability to reduce the spurious oscillations and to provide an accurate estimate of the cutting parameters. Numerical tests are presented to validate the proposed modeling strategies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Meccanica Springer Journals

Blade cutting of thin walled structures by explicit dynamics finite elements

Loading next page...
 
/lp/springer_journal/blade-cutting-of-thin-walled-structures-by-explicit-dynamics-finite-92D1DOTtaw
Publisher
Springer Netherlands
Copyright
Copyright © 2017 by Springer Science+Business Media B.V.
Subject
Physics; Classical Mechanics; Civil Engineering; Automotive Engineering; Mechanical Engineering
ISSN
0025-6455
eISSN
1572-9648
D.O.I.
10.1007/s11012-017-0779-x
Publisher site
See Article on Publisher Site

Abstract

In cohesive crack propagation induced by blade cutting, it is necessary to consider the blade radius of curvature as a characteristic length additional to the shell thickness and to the cohesive process zone length, which usually characterize crack propagation in thin walled structures. When the finite element simulation of a blade cutting process is considered, these three lengths need to be properly resolved. The blade radius of curvature can be orders of magnitude smaller than the shell thickness and the cohesive process zone. Furthermore, the transition from a continuous mesh to a mesh containing a crack with a cohesive interface is well known to be critical for solution accuracy. Nodal equilibrium is in general violated during the transition, with subsequent generation of spurious stress oscillations that, in view of the non-reversible nature of the problem, can lead to significant inaccuracies in the stress response. The smallest length, i.e. the blade radius of curvature, is here resolved using the so called directional cohesive element model as in Pagani and Perego (CMAME 285:515–541, 2015), while the structural thickness is modeled using solid-shell elements. The concept of directional cohesive elements is here extended for application to the case of cutting by scissors. As for the cohesive process zone length, different modeling options are discussed in terms of their capability to reduce the spurious oscillations and to provide an accurate estimate of the cutting parameters. Numerical tests are presented to validate the proposed modeling strategies.

Journal

MeccanicaSpringer Journals

Published: Nov 2, 2017

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off