Felix Welsch

Felix Welsch
Universität des Saarlandes | UKS · Department of Mechatronics

Master of Science

About

31
Publications
5,281
Reads
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257
Citations
Citations since 2016
31 Research Items
252 Citations
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20162017201820192020202120220204060
20162017201820192020202120220204060
20162017201820192020202120220204060

Publications

Publications (31)
Article
Full-text available
Nonunion is a complication of long bone fractures that leads to disability, morbidity and high costs. Early detection is difficult and treatment through external stimulation and revision surgery is often a lengthy process. Therefore, alternative diagnostic and therapeutic options are currently being explored, including the use of external and inter...
Conference Paper
Full-text available
Pneumatic Systems, especially those working with compressed air, come with several drawbacks like poor energy efficiency, high level of emission and limited digitalization amongst others. Therefore, there are efforts in industry to replace pneumatics with purely electrical systems. A promising approach in gripping and handling technology is the sha...
Conference Paper
Full-text available
Shape memory alloys (SMA) are used as an attractive technology in the field of actuators and sensors due to their versatile geometry, lightweight, high energy density, and low cost. The thermal activation principle, however, makes SMA application generally suitable for low-frequency (few Hz) regimes. In this work, a novel SMA-based antagonistic act...
Conference Paper
Full-text available
In this paper, a shape memory alloy (SMA) based handling system is presented. The gripping system consists of two different actuator systems based on SMA wires. The first one is a reconfigurable end-effector with four independent gripping arms. The second SMA actuator system is a bi-stable SMA actuated vacuum suction cup, of which one is mounted on...
Conference Paper
Full-text available
Elastocaloric (EC) cooling uses solid-state NiTi-based shape memory alloy (SMA) as a non-volatile cooling medium and enables a novel environment-friendly cooling technology. Due to the high specific latent heats activated by mechanical loading/unloading, substantial temperature changes are generated in the material. Accompanied by a small required...
Conference Paper
Full-text available
As an eco-friendly alternative, elastocaloric cooling promises to become an alternative to the prevalent vapor compression-based process. In the past years, many elastocaloric cooling devices have been developed. One of the most promising ones by Kirsch et al., which utilizes thin NiTiCo shape memory alloy (SMA) wires in bundle arrangements to perf...
Article
Full-text available
One of the most important parameters of superelastic shape memory alloys to be used in elastocaloric cooling and heating processes is their specific latent heat. Usually, the latent heat of a material is determined by differential scanning calorimetry (DSC) where the material phase transformation is induced thermally under zero stress. During elast...
Article
Full-text available
One of the most important parameters of superelastic shape memory alloys to be used in elastocaloric cooling and heating processes is their specific latent heat. Usually, the latent heat of a material is determined by differential scanning calorimetry (DSC) where the material phase transformation is induced thermally under zero stress. During elast...
Conference Paper
Full-text available
Elastocaloric cooling uses solid-state NiTi-based shape memory alloy (SMA) as a non-volatile cooling medium and enables a novel environment-friendly cooling technology. Due to the high specific latent heats activated by mechanical loading/unloading, substantial temperature changes are generated in the material. Accompanied by a small required work...
Conference Paper
Full-text available
Elastocaloric cooling uses solid-state NiTi-based shape memory alloy (SMA) as a non-volatile cooling medium and enables a novel environment-friendly cooling technology without global warming potential. Due to the high specific latent heats activated by mechanical loading/unloading, large temperature changes can be generated in the material. Accompa...
Article
Open-cell metal/polymer hybrid foams are biomimetic open-porous composites, consisting of a polymeric foam electrochemically coated with a metallic layer. Due to their specific pore structure, they can be used in lightweight applications or as crash absorbers. The nanocrystalline coating leads to a strengthening effect and largely improved energy a...
Conference Paper
One of the most important parameters of superelastic shape memory alloys (SMA) to be used in elastocaloric cooling and heating processes is their specific latent heat. Thus, when developing and evaluating new materials for elastocaloric processes the determination of the latent heat is an essential step. Usually, the latent heat of a material is de...
Article
This contribution provides an experimental analysis of relevant parameters to determine the air cooling potential of elastocaloric shape memory alloys (SMAs) in the form of wires. An essential step consists in developing a scientific test setup, which offers the ability to determine these parameters under varying conditions like wire geometry, mate...
Conference Paper
Full-text available
The following contribution provides analyses of the air cooling potential of elastocaloric shape memory alloys (SMAs) in form of NiTiCo wires. An essential step consists in developing a scientific test setup, which offers the ability to determine the air-cooling potential under varying conditions like wire geometry, material composition, and proces...
Conference Paper
Elastocaloric cooling based on NiTi exhibits an excellent cooling capability, due to the high specific latent heats activated by mechanical loading/unloading and the small required work input. The work of the current funding period in the DFG Priority Program SPP 1599, is focused on the development and realization of a continuous operating elastoca...
Conference Paper
Elastocaloric cooling based on NiTi exhibits an excellent cooling capability, due to the high specific latent heats activated by mechanical loading/unloading and the small required work input. The current funding period of the DFG Priority Program SPP 1599 focuses on the development and realization of a continuously operating elastocaloric cooling...
Poster
Researche objective Motivation: • Elastocaloric cooling is: • Environment-friendly • No global warming potential • Non volatile refrigerant • Elastocaloric material provides: • Large temperature changes in material • High specific latent heats released at first-order transformation • High coefficient of performance (COP) Goal: • Development and re...
Poster
Research Topic Motivation for elastocaloric cooling:  Environment-friendly alternative to vapor compression-based systems  Large latent heats and small work input result in efficient cooling cycle  Adiabatic loading/unloading of elastocaloric material causes crystallographic phase transformation accompanied by large temperature increase/decreas...
Poster
Elastocaloric cooling based on NiTi exhibits an excellent cooling capability, due to the high specific latent heats activated by mechanical loading/unloading and the small required work input. The work of the current funding period in the DFG Priority Program SPP 1599, is focused on the development and realization of a continuous operating elastoca...
Conference Paper
Full-text available
This paper presents the design and the realization of an innovative SMA actuated bistable vacuum suction cup. The sealed, compact and fully integrated design enables the positioning and transport of inherent stable components in mobile and stationary applications. The bistable actuator mechanism based on SMA wires combined with a bistable spring re...
Conference Paper
Elastocaloric cooling is a novel environment-friendly alternative to vapor compression-based cooling systems. This solid-state cooling technology uses NiTi shape memory alloys (SMAs) as cooling medium. SMAs are well known for lightweight actuator systems and biomedical applications, but in addition, these alloys exhibit excellent cooling properties...
Poster
This poster presents the design and the realization of an innovative SMA actuated bistable vacuum suction cup.
Conference Paper
Full-text available
Commercially available SMA actuated devices usually integrate only a single wire, which dimensions are determined by the force necessary to achieve a desired actuation. Usually, if higher forces are requested, a wire with a bigger diameter is chosen since bigger diameters correspond to higher forces, but, on the other hand, also to a smaller surfac...
Conference Paper
Shape memory alloy (SMA) materials represent an attractive technology in the field of actuator mechanisms for the realization of low cost and lightweight actuators and sensors. This article presents an innovative SMA actuated bistable vacuum suction cup. The sealed, compact and fully integrated design enables the positioning and transport of differ...
Presentation
Shape Memory Effect Motivation First SMA based vacuum suction cup Bistable SMA vacuum suction cup Principle Design Realization
Article
Solid state cooling is an environment‐friendly, no global warming potential alternative to vapor compression‐based systems. Elastocaloric cooling based on NiTi shape memory alloys exhibits excellent cooling capabilities. Due to the high specific latent heats activated by mechanical loading/unloading, large temperature changes can be generated in th...
Conference Paper
Dielectric Elastomers (DE) represent an attractive technology in the field of electromechanical transducers for the realization of low cost actuators and sensors. These devices consist of a thin DE membrane with flexible electrodes resulting in a stretchable capacitor. An electrical field, applied by the electrodes causes a thickness reduction due...
Article
Full-text available
The exploitation of the elastocaloric effect in superelastic shape memory alloys (SMA) for cooling applications shows a promising energy efficiency potential but requires a better understanding of the non-homogeneous martensitic phase transformation. Temperature profiles on sputter-deposited superelastic \({\mathrm {Ti_{55.2}Ni_{29.3}Cu_{12.7}Co_{2...
Conference Paper
The following contribution presents a new concept of an air conditioning device based on the elastocaloric cooling effect of shape memory alloys (SMA's). This technology provides an energy efficient and environment friendly alternative to conventional vapor compression based cooling principles. Starting from the thermodynamic investigation of the e...

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Projects

Projects (2)
Project
Development of Cooling and Heating processes and devices based on Shape Memorys Alloys
Project
Development of Cooling and Heating processes and devices based on Shape Memorys Alloys