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Dirk Lehmhus   Dr.  Senior Scientist or Principal Investigator 
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Dirk Lehmhus published an article in August 2017.
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0 Epoxy
0 Heat Treatment
0 Mechanical Properties
0 Melting
0 Microspheres
Top co-authors See all
Toshiya Kaihara

91 shared publications

Graduate School of System Informatics, Kobe University, Kobe, Japan

Francesco Ciucci

82 shared publications

Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, SAR, China

Stefano Mariani

78 shared publications

Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale, Piazza L. da Vinci 32, 20133 Milano, Italy

Thomas Fiedler

75 shared publications

School of Engineering, The University of Newcastle, Australia

Matej Vesenjak

52 shared publications

Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia

8
Publications
16
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42
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Publication Record
Distribution of Articles published per year 
(2013 - 2017)
Total number of journals
published in
 
7
 
Publications See all
Article 0 Reads 8 Citations From Stochastic Foam to Designed Structure: Balancing Cost and Performance of Cellular Metals Dirk Lehmhus, Matej Vesenjak, Sven Schampheleire, Thomas Fie... Published: 08 August 2017
Materials, doi: 10.3390/ma10080922
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
Over the past two decades, a large number of metallic foams have been developed. In recent years research on this multi-functional material class has further intensified. However, despite their unique properties only a limited number of large-scale applications have emerged. One important reason for this sluggish uptake is their high cost. Many cellular metals require expensive raw materials, complex manufacturing procedures, or a combination thereof. Some attempts have been made to decrease costs by introducing novel foams based on cheaper components and new manufacturing procedures. However, this has often yielded materials with unreliable properties that inhibit utilization of their full potential. The resulting balance between cost and performance of cellular metals is probed in this editorial, which attempts to consider cost not in absolute figures, but in relation to performance. To approach such a distinction, an alternative classification of cellular metals is suggested which centers on structural aspects and the effort of realizing them. The range thus covered extends from fully stochastic foams to cellular structures designed-to-purpose.
CONFERENCE-ARTICLE 5 Reads 0 Citations Foreword: Proceedings of the 3rd International Electronic Conference on Sensors and Applications Stefano Mariani, Francesco Ciucci, Dirk Lehmhus, Thomas B. M... Published: 31 May 2017
Proceedings, doi: 10.3390/ecsa-3-03908
DOI See at publisher website ABS Show/hide abstract

This issue of Proceedings gathers the papers presented at the 3rd International Electronic Conference on Sensors and Applications (ECSA-3), held online on 15-30 November 2016 through the sciforum.net platform developed by MDPI. The annual ECSA conference was initiated in 2014 on an online basis only, to allow the participation from all over the world with no concerns of travel and related expenditures. This type of conference looks particularly appropriate and useful because research concerned with sensors is rapidly growing, and a platform for rapid and direct exchanges about the latest research findings can provide a further burst in the development of novel ideas.

Article 0 Reads 15 Citations Cloud-Based Automated Design and Additive Manufacturing: A Usage Data-Enabled Paradigm Shift Dirk Lehmhus, Thorsten Wuest, Stefan Wellsandt, Stefan Bosse... Published: 19 December 2015
Sensors, doi: 10.3390/s151229905
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
Integration of sensors into various kinds of products and machines provides access to in-depth usage information as basis for product optimization. Presently, this large potential for more user-friendly and efficient products is not being realized because (a) sensor integration and thus usage information is not available on a large scale and (b) product optimization requires considerable efforts in terms of manpower and adaptation of production equipment. However, with the advent of cloud-based services and highly flexible additive manufacturing techniques, these obstacles are currently crumbling away at rapid pace. The present study explores the state of the art in gathering and evaluating product usage and life cycle data, additive manufacturing and sensor integration, automated design and cloud-based services in manufacturing. By joining and extrapolating development trends in these areas, it delimits the foundations of a manufacturing concept that will allow continuous and economically viable product optimization on a general, user group or individual user level. This projection is checked against three different application scenarios, each of which stresses different aspects of the underlying holistic concept. The following discussion identifies critical issues and research needs by adopting the relevant stakeholder perspectives.
CONFERENCE-ARTICLE 4 Reads 0 Citations <strong>Material-integrated Intelligent Systems: A Review on State of the Art, Challenges and Trends</strong> Dirk Lehmhus, Stefan Bosse Published: 06 November 2015
2nd International Electronic Conference on Sensors and Applications, doi: 10.3390/ecsa-2-D002
DOI See at publisher website ABS Show/hide abstract

As a concept, material-integrated intelligent systems represent the vision of embedding not only sensors, but full sensor networks with smart sensors in technical materials, irrespective of their application being dominated by functional or structural properties. In this sense, the term full sensor networks encompasses the sensors, the associated signal and data processing, the data evaluation and information retrieval, provisions for communication within the network and beyond it, and an energy supply system. The concept as such can be applied to any type or class of host material, ranging from organic materials to composites, metals and ceramics. The result are materials that are, in a manner of speaking, able to “feel” in the broader sense associated with this term. Applications which would profit from such materials are diverse and range from structural health monitoring and control to fly by feel, robotics, human machine interaction to new types of user interfaces. Similarly, the fields of use differ widely from aerospace and other transport applications via advanced manufacturing systems to consumer products. Of specific interest for economic reasons are semi-finished materials that can be processed into several different products.

Needless to say, systems integrated into rather than externally attached to a host material or structure face several unique challenges, among them the need for

  • reliability and fault tolerance
  • autonomy in terms of energy supply and information processing
  • mechanical and thermal stability sufficient to survive production
  • mechanical and thermal stability sufficient to survive service life
  • compatibility of mechanical and thermal properties with the host material
  • scalability regarding network size on hard- and software level
  • adaptability w.r.t. changes in environment and inner state

The present works discusses current approaches towards realizing material-integrated intelligent systems. In doing so, addressing the conceptual level is just one side of our work; besides, we attempt to provide a matrix that matches the challenges listed above with technological approaches that show the necessary potential for providing solutions. In this, the focus is clearly not limited to a hardware perspective, but includes software-based methods, too, e. g. in terms of guaranteeing reliability and fault tolerance in data evaluation and communication, or in making best use of available energetic resources, to name but a few examples: Material-embedded sensor networks must operate under low-resource, low-energy, and technical failure constraints, requiring new concepts in information processing.

Based on this analysis of fundamental technologies and already-realised concepts, we identify knowledge gaps that currently still hamper the broader implementation of material-integrated intelligent systems and derive suggestions for future research paths from it.

A special section is dedicated to the advent of additive manufacturing techniques adapted to facilitate sensor integration: The present growth in this field is expected to extend into the field of sensor-integrated materials and structures. First approaches in this direction will be discussed in the present work.

Article 0 Reads 6 Citations Taking a downward turn on the weight spiral – Lightweight materials in transport applications Dirk Lehmhus, Axel Von Hehl, Kambiz Kayvantash, Rudolf Gradi... Published: 01 February 2015
Materials & Design, doi: 10.1016/j.matdes.2014.10.001
DOI See at publisher website
Article 3 Reads 2 Citations Mechanical performance of structurally optimized AlSi7 aluminum foams - an experimental study D. Lehmhus, Matthias Busse Published: 04 December 2014
Materialwissenschaft und Werkstofftechnik, doi: 10.1002/mawe.201400354
DOI See at publisher website
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