Failure Modeling of Hybrid Transition Structures

2016 ◽  
Vol 831 ◽  
pp. 44-53 ◽  
Author(s):  
Vitali Bitykov ◽  
Frank Jablonski
Keyword(s):  
Adhesive Bonding ◽  
Numerical Approach ◽  
The Finite Element Method ◽  
Metal Structures ◽  
Reinforced Plastics ◽  
Failure Modeling ◽  
Transition Structures ◽  
Failure Properties ◽  
Fiber Reinforced Plastics ◽  
Failure Tree

Metal structures and components made of fiber reinforced plastics are often tied using bolts, rivets or adhesive bonding methods. To avoid the disadvantages of these techniques, hybrid transition structures can be used. Two different concepts are investigated and a numerical approach to calculate the failure properties of such transition structures is proposed. This is done using cohesive zone models for a wire concept and probability functions in an extended failure tree analysis for a foil concept. Numerical results based on the finite element method are presented.

Surface Pretreatment of Fiber-Reinforced Plastics via VUV Radiation

2017 ◽  
Vol 742 ◽  
pp. 70-73
Author(s):  
Christoph Schmüser ◽  
Kira Rosanova ◽  
Christopher Dölle
Keyword(s):  
Surface Energy ◽  
Power Plants ◽  
Adhesive Bonding ◽  
Surface Preparation ◽  
Transport Sector ◽  
Contact Method ◽  
Fiber Reinforced ◽  
Release Agent ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

Fiber-reinforced plastics (FRP) are of great importance for the transport sector, the aerospace industry, for wind power plants, in the building sector and in the field of sports and leisure applications. Optimization of the adhesive bonding process for FRP structures, especially the surface preparation prior to bonding, will be of a central importance in forthcoming expansion of FRP use. In this connection the key problem depends on the FRP polymer matrix. In the case of duroplastic matrix the main problem is the presence of release agent on the surface of joining components. For the thermoplastic matrix such as polypropylene (PP), the main problems are the low surface energy and the inertness of its surface. Conventional pretreatment methods, such as manual grinding, shall be replaced by energetic radiation technics like VUV lamps (vacuum ultraviolet spectral range: 100 – 200 nm). This approach is a non-contact method, characterized by high treatment homogeneity and material-saving properties, combined with no further fibers to be released. The surface of the thermoplastics is activated by the incorporation of oxygen, release agent contamination on the thermoset is cleaned or modified [1 - 8]. The results of the VUV surface activation of PP and CFRP with regard to the incorporation of functional groups, increase of surface energy, matrix degradation and the adhesion increase of adhesive bonds are presented. In addition, studies on the release agent coating and the release agent modification by VUV radiation are presented. The work is completed by considerations concerning possibilities to accelerate the process (in particular, wavelength dependence, influence of an inert gas or the moisture content). Finally, an evaluation of the VUV pretreatment is carried out on the basis of two specific applications.

scholarly journals Cold surface treatments on fiber-reinforced plastics by pulsed laser

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Jana Gebauer ◽  
Gerd Paczkowski ◽  
Jodok Weixler ◽  
Udo Klotzbach
Keyword(s):  
Adhesive Bonding ◽  
New Technologies ◽  
Thermal Spraying ◽  
Fiber Reinforced ◽  
Cold Surface ◽  
Promising Alternative ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Matrix Removal ◽  
Fiber Reinforced Plastics

When producing fiber-reinforced plastic (FRP) suitable for mass production, new technologies have to be developed to overcome existing challenges such as increased efficiency in resource consumption or higher process flexibility. In the past, laser processing has been shown to yield important advantages such as non-contact processing, no tool wear and high design flexibility.Pulsed laser ablation of FRP offers a promising alternative to state of the art mechanical blasting. The selective matrix removal enables a high potential to improve adhesive bonding, molding processes and coating deposition of lightweight materials, especially FRP-metal or FRP-ceramic hybrids. The resulting increase in surface area exhibits forms lock characteristics and simultaneously provides an expanded interface area. As a result, 40 % higher tensile strength can be reached in pull-off tests compared to a mechanically blasted organic sheet surface, joined by thermal spraying of aluminum on carbon fiber-reinforced epoxy (CFRP).

Robust Design Optimierung endlosfaserverstärkter Verbundbauteile

2018 ◽  
Author(s):  
Markus Kellermeyer
Keyword(s):  
Product Performance ◽  
Design Stage ◽  
Manufacturing Cost ◽  
The Finite Element Method ◽  
Reinforced Plastics ◽  
Embodiment Design ◽  
Low Weight ◽  
Wide Range ◽  
Low Mass ◽  
Fiber Reinforced Plastics

Abstract Components made of continous fiber-reinforced plastics can reach a great lightweight potential if the material is aligned with the direction of the force. The advantages that come along with the high stiffness at low mass justify the use in a wide range of industry although the manufacturing cost might be higher than for other conventional materials. But with the possibilities to locally influence the mechanical properties there are complicated mechanismen that must be handled and that can be quite challenging for constructions. And also the manufacturing processes which are often done by hand can have significant scatter that might influence the product performance in a negative way. For this reason the objective of this work is to develop an approach based on the finite element method that supports the product developer in the early embodiment design stage to improve an existing layer stack in terms of low weight while keeping the probability of failure low. For this purpose...

Individualized and controlled laser beam pre-treatment process for adhesive bonding of fiber-reinforced plastics. III. Effects of contaminants

2021 ◽  
Vol 33 (4) ◽  
pp. 042051
Author(s):  
Hagen Dittmar ◽  
Christoph J. A. Beier ◽  
Josef Weiland ◽  
Alexander Schiebahn ◽  
Peter Jaeschke ◽  
...  
Keyword(s):  
Laser Beam ◽  
Adhesive Bonding ◽  
Treatment Process ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Pre Treatment
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