Holger Fricke

Holger Fricke

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Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 December 2021 in The Journal of Adhesion
Verified
Journal Article
Closed access
CDChristian Denkert
Christian Denkert
TGThomas Gerke
Thomas Gerke
RGRalf Glienke
Ralf Glienke
MDMaik Dörre
Maik Dörre
MHMichael Knuth Henkel
Michael Knuth Henkel
Till ValléeTill Vallée
Till Vallée
The choice of a suitable joining method is of major importance for the performance and durability of structural connections in any type of construction and in other branches of industry, such as the manufacturing of sliding vehicles. In addition to mechanical joints using high-strength bolts as well as welding, adhesive bonding is more and more being considered as a serious alternative. Hybrid joints are the focus of the research, especially to increase load-bearing capacity and reduce deformation. This project specifically aims at the combination of elementary bonded joints and High Strength Friction Grip Bolts to form the so-called pre-loaded hybrid joint. The pre-loaded hybrid joint optimally combines the specific advantages of both elementary joining methods and thus creates an efficient structural joint. This research takes up the findings of a previous project and focuses on the characterisation of the pre-loaded hybrid joint with regard to its application in the field. For this purpose, a comprehensive experimental test programme is carried out, which served for the validation of a numerical model generated for the computational load prediction in a companion paper.
18 November 2015 in The Journal of Adhesion
Verified
Journal Article
Closed access
HFHolger Fricke
Holger Fricke
Till ValléeTill Vallée
Till Vallée
To manufacture multi-material hybrid parts for the automotive industry, mechanical joining processes like riveting are well established. However, adhesive bonding is increasingly being used in the car body to realize lightweight structures with high crash performance using a multi-material design. The combination of the specific advantages of both joining techniques in form of hybrid joints yields in synergies of manufacturing, crash, and durability performance. Critical issues when combining riveting with bonding are the formation of adhesive pockets in the region of the mechanical junctions, and global deformations of the metal blanks between the mechanical joints. Pockets in the region of the mechanical junctions decrease the strength of the mechanical joints. Global deformations caused by the formation of adhesives pockets while the multi-point mechanical fixation process takes place, influence the smoothness of the bonded part’s surface. This project focuses the numerical simulation of the time dependent formation process of both types of pockets with the aim to better understand the parameters affecting them, and to develop better processes.
31 January 2019 in The Journal of Adhesion
Verified
Journal Article
Closed access
MBMartin Bues
Martin Bues
CSChristian Schuler
Christian Schuler
MAMatthias Albiez
Matthias Albiez
TUThomas Ummenhofer
Thomas Ummenhofer
HFHolger Fricke
Holger Fricke
Till ValléeTill Vallée
Till Vallée
In glass and façade constructions, elastic thick layer bonds are used to join glass panes to metal adapter frames and glass support elements. This joining technique is referred to as Structural Glazing (SG) or Structural Sealant Glazing (SSG) and is realized as a line-shaped, load-bearing bond using silicone adhesives, or adhesive tapes. The available technical guidelines (for example, ETAG 002) do no longer adequately reflect the state of the art at two critical levels. Firstly, they impose restrictions on the application, and, secondly, dimensioning specifications available in the technical guidelines are not applicable to modern, large-area façade constructions. This paper summarizes selected findings of a recently finished research program. Two silicone adhesives were experimentally characterized as bulk material and bonded specimens. The main focus of the experimental campaign was set on the investigation of the load-bearing capacity of bonded specimens of different geometries, load directions, and temperatures. These results allowed to set the basis for the developed stress-based design concept, which concludes this paper.
2 June 2021 in Polymers
Verified
Journal Article
Open access
PDF file
NKNurziana Kong
Nurziana Kong
NKNur Zalikha Khalil
Nur Zalikha Khalil
HFHolger Fricke
Holger Fricke
In the current work, an attempt has been made to investigate the effect of Graphene Nanoplatelets (GNP) reinforcement to water absorption behavior and mechanical properties of adhesive bonding with epoxy. Epoxy adhesive with various GNP content (i.e., 0.0~2.0 wt%) was utilized to joint aluminum adherend subjected to various immersion periods (i.e., 0~60 days). Subsequently, the effect of GNP reinforcement on water uptake, water absorption rate and tensile shear strength was investigated. Depending on GNP content, two distinct behaviors in water uptake and moisture absorption rate have been observed; specimens with lower GNP content (0.5~1.0 wt%) have demonstrated increased/retention of water uptake and water absorption rate regardless of immersion period. Meanwhile, at higher GNP content (1.5~2.0 wt%), decreased water uptake and water absorption rate are generally observed. At similar GNP content, regardless of immersion periods, water immersed specimens generally demonstrate higher or retention of shear strength when compared to specimens at 0-day immersion period. These observations suggest that the relation between moisture absorption behavior and mechanical properties of GNP-reinforced adhesive with GNP content are rather complex which might be attributed to the interplay of several possible mechanisms.
4 January 2024 in International Journal of Adhesion and Adhesives
Verified
Journal Article
Closed access
MHMoritz Huf
Moritz Huf
Till ValléeTill Vallée
Till Vallée
HFHolger Fricke
Holger Fricke
24 May 2021 in The Journal of Adhesion
Verified
Journal Article
Closed access
Till ValléeTill Vallée
Till Vallée
HFHolger Fricke
Holger Fricke
SMSebastian Myslicki
Sebastian Myslicki
MKMarvin Kaufmann
Marvin Kaufmann
MVMorten Voß
Morten Voß
TGThomas Gerke
Thomas Gerke
Strength prediction of bonded joints remains a challenging task made even further complicated for hybrid joints in which adhesive is supplemented by mechanical fasteners. The present paper complements a series of experimental investigations on hybrid joints combining adhesive bonding with pre-tensioned bolts on galvanised and coated steel substrates, and considering two adhesives. The paper starts with modelling the strength of the bonded connection under the simultaneous action of tensile and compressive normal stresses, and shear. It then presents how these data are moulded into appropriate failure criteria and used the latter as input data for a subsequent full probabilistic finite element analysis. Following the paths of Weibull and subsequent researchers, joint capacity is predicted with reasonable accuracy for a dozen different combinations of substrates, adhesive, and pre-tension level – for which, on average, an accuracy slightly below 10% has been achieved. The results deliver meaningful insights into the subtle relationship between adhesive bonding, mechanical fastening, failure criteria, and resulting predictions methods.