Characteristics of Titanium Interface Structures for Advanced FRP-Aluminium Compounds

2011 ◽  
Vol 690 ◽  
pp. 266-269 ◽  
Author(s):  
Kai Schimanski ◽  
Jens Schumacher ◽  
Anna Lang ◽  
Axel von Hehl ◽  
Hubert Bomas
Keyword(s):  
Fracture Behaviour ◽  
Aerospace Industry ◽  
Laser Beam Welding ◽  
Lightweight Structures ◽  
Numerical Investigations ◽  
Reinforced Plastic ◽  
Riveted Joints ◽  
Interdisciplinary Projects ◽  
The University ◽  
Interface Structures

Modern lightweight structures containing hybrid materials allow an improvement of the weight-specific properties. In this regard, the great potential of FRP-Al (fibre reinforced plastic - aluminium) structures is far from being exhausted. As an alternative to bulky riveted joints the development of integral joint concepts with good corrosion resistance has currently a high priority for aerospace industry. The DFG researcher group ‘Schwarz-Silber’ (FOR 1224) at the University of Bremen set itself the goal to explore and develop interface structures for advanced FRP-Al compounds. Considering textile, welding and casting techniques, novel joint concepts will be designed, dimensioned and produced within five interdisciplinary projects. Experimental and numerical investigations support the validation and enhancements of the developed solutions. Regarding the joint concept combining textile and welding techniques, basic investigations were done. This concept envisages the coupling of FRP with Al sheets by using Ti wire loops at the materials interface. It is intended to join the wire loops by textile techniques on the FRP side and on the Al side by laser beam welding. The results showed a correlation between the microstructure and the fracture behaviour of the Ti-FRP joint under static loading. Based on these results, first design principles for advanced FRP-Al compounds with Ti interface structures are derived.

scholarly journals A Quality Study of a Self-Piercing Riveted Joint between Vibration-Damping Aluminum Alloy and Dissimilar Materials

2020 ◽  
Vol 10 (17) ◽  
pp. 5947
Author(s):  
Dong Hyuck Kam ◽  
Taek Eon Jeong ◽  
Jedo Kim
Keyword(s):  
Aluminum Alloy ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Dissimilar Materials ◽  
Vibration Damping ◽  
Shear Load ◽  
Load Testing ◽  
Tensile Shear ◽  
Reinforced Plastic ◽  
Riveted Joints

This study investigates the quality of self-piercing riveted joints between vibration-damping aluminum (Al) and other dissimilar materials, namely aluminum alloy (AL5052-H32), steel alloy (GA590DP), and carbon-reinforced plastic (CFRP). The effects of die types (flat, cone, and nipple) on the geometrical characteristics and mechanical performance of the joints are studied using a cross-section examination and tensile shear load testing. The failure modes of each joint are also presented, showing the nature of the forces leading to the joint failures. The results indicate that, for all configurations, adequate joining between vibration-damping Al with AL5052-H32 is expected with a maximum shear load up to 3.28 kN. A shear load up to 3.6 kN was measured for the joints with GA590DP panels with acceptable top and bottom seal characteristics. A vibration-damping Al panel can only be positioned at the bottom when riveting with CFRP due to the brittle nature of CFRP. A tensile shear load up to 2.26 kN was found, which is the lowest amongst the materials tested in this study.

Generation of Intake Distortion due to Angle of Attack for a High Bypass Turbofan Model

2014 ◽  
Author(s):  
Jan-Hendrik Krone ◽  
Jens Friedrichs
Keyword(s):  
Wind Tunnel ◽  
Angle Of Attack ◽  
Experimental Setup ◽  
Jet Engine ◽  
Numerical Investigations ◽  
Fan Performance ◽  
Aerodynamic Interaction ◽  
Inlet Conditions ◽  
The University ◽  
Operating Points

This article presents a new fan testing concept which was developed by the University of Braunschweig. The aim of the concept is to provide an experimental setup for integrated jet engine fan investigations. This integrated setup includes a full bypass model with nacelle geometry in order to obtain all aerodynamic interaction effects. Since these interactions have a strong dependency from fan inlet conditions the facility provides wind tunnel capacities. Generating both uniform and angle of attack inlet conditions it is possible to investigate fan performance during the most critical operating points of a civil flight mission. The main innovation of the wind tunnel is the crosswind concept for generating angle of attack conditions in case of a non-pitchable fan unit. Numerical investigations in this paper are intended to validate this new concept by means of typical angle of attack simulations. The results show that the crosswind concept is able to generate equivalent cp-characteristics as obtained for the reference simulations at the nacelle 6 o‘clock and 12 o‘clock positions.

scholarly journals Research underway in the Minakuchi Lab – new fiber features to control crack propagation in composite materials

Impact ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. 20-21
Author(s):  
Shu Minakuchi
Keyword(s):  
Composite Materials ◽  
Aerospace Industry ◽  
Reinforced Plastics ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Wide Range ◽  
Technological Developments ◽  
Materials Used ◽  
The University ◽  
Carbon Fibre Reinforced Plastics

Composite materials are materials that are made by combining one or two materials. Composite materials have been used by humans for thousands of years but as technological developments increase, more and more examples of composite materials have been created which has led to a staggering number of innovations in a wide range of different fields. One major example of this is the aerospace industry which relies on materials that are strong but light. It is essential that an aircraft is strong enough to resist the enormous stresses that are placed on it by its mechanisms and the environment in which it operates, but light enough to be propelled thousands of miles into the sky. Some of the most abundant composite materials used in the aerospace industry are carbon fibre reinforced plastics (CFRP) which are the focus of Dr Shu Minakuchi's research team at the Minakuchi Laboratory within the Department of Aeronautics and Astronautics, The University of Tokyo. Minakuchi's team is working on advanced composite materials represented by CFRPs, with a view to overcoming some of the problems associated with cracks from stresses and their propagation.

scholarly journals Cylindrical Shells Made of Stainless Steel – Investigation of Postbuckling

2017 ◽  
Vol 25 (2) ◽  
pp. 185-197
Author(s):  
Sebastian Stehr ◽  
Natalie Stranghöner
Keyword(s):  
Stainless Steels ◽  
High Sensitivity ◽  
Economic Advantage ◽  
Wind Loading ◽  
Load Case ◽  
Lightweight Structures ◽  
Stabilization Effect ◽  
Thin Walled ◽  
The University ◽  
Very High

Abstract The relevant load case of open thin-walled shells is often wind loading during construction. Because of the missing stabilization effect of the roof they show a very high sensitivity to buckling which results into higher wall thicknesses. As part of the European RFCS research project BiogaSS the Institute for Metal and Lightweight Structures of the University of Duisburg-Essen carried out investigations on open thin-walled tanks made of austenitic and duplex stainless steels under wind load to study a possible economic advantage which might be gained from the consideration of the elastic postbuckling behaviour. This contribution presents not only experimental and numerical results but also first recommendations regarding the range of possible buckling reduction factors which might be incorporated in future revisions of EN 1993-1-6 and EN 1993-4-2.

EXAMINATION OF THE IMPACT OF AGGRESSIVE ENVIRONMENTAL FACTORS ON THE DEVELOPMENT OF CORROSION DAMAGE ON SAMPLES OF LAMINATED GLASS-REINFORCED PLASTIC OF SIAL CLASS

2021 ◽  
pp. 81-90
Author(s):  
V.A. Duyunova ◽  
◽  
A.E. Kutyrev ◽  
N.Yu. Serebrennikova ◽  
A.I. Vdovin ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Layer Structure ◽  
Low Cycle Fatigue ◽  
Corrosion Damage ◽  
Laminated Glass ◽  
Reinforced Plastic ◽  
Riveted Joints ◽  
Moisture Saturation ◽  
The Impact ◽  
Salt Fog

The article presents the results of examination of the influence of aggressive environmental factors during tests in a salt fog chamber and moisture saturation on the strength characteristics and low-cycle fatigue of riveted joints of laminated glass-reinforced plastic with and without an integrated protection system. It is shown that the multilayer structure of SIAL prevents the development of corrosion damage in layers along the depth of the material. The mechanical properties of samples made of SIAL material with three-layer and five-layer structure after moisture saturation practically do not change. It was found that the lack of corrosion protection of the laminated material leads to a decrease in the fatigue life of riveted joints.

scholarly journals Mechanical Engineering Capstone Design Course – CEAB Accreditation Outcomes Assessment

2015 ◽  
Author(s):  
Jacqueline Stagner ◽  
Jennifer Johrendt
Keyword(s):  
Final Report ◽  
Improvement Program ◽  
Team Interaction ◽  
Materials Engineering ◽  
Undergraduate Experience ◽  
Interdisciplinary Projects ◽  
The University ◽  
Design Proposal ◽  
A Company ◽  
Capstone Design

Due to the comprehensive nature of the two-semester Capstone Design course for fourth-year students, many of the Canadian Engineering Accreditation Board (CEAB) Graduate Attributes (GrAtts), and associated learning outcomes (LOs), are present within the course. As the term ‘graduate attribute’ implies, students should exhibit specific attributes upon graduation. Thus, assessing these attributes in the students’ final year enables the faculty and students to verify that the goal of achieving these attributes has been accomplished. However, it is also necessary to examine the results of the assessments to make any downstream adjustments to the curriculum, to address any weaknesses in specific attributes.The undergraduate course calendar provides the following course description for the Capstone Design course:Student design teams, operating within a "company" environment, utilize the broad range of their undergraduate experience in interdisciplinary projects selected to promote interaction between the mechanical, automotive, and materials programs. Design methodologies and team interaction simulate future professional practice. Project milestones include: a design proposal with cost analysis and scheduling, construction and commissioning of the designed apparatus, and a final report and presentation having both global and detail completeness [1].One can see that the course is comprehensive; however, it is also quite unique for each design team as it pertains to each specific project. The uniqueness of projects, along with the fact that there are multiple advisors and assessors of projects, provides challenges to ensuring accurate and consistent assessments.This paper will describe what the department of Mechanical, Automotive & Materials Engineering (MAME) at the University of Windsor has incorporated into the Capstone Design course to assess many of the CEAB GrAtts and LOs, and implement a continuous improvement program for the department.

scholarly journals PRELIMINARY EXPERIENCE FROM THE T-SAT PROJECT

2011 ◽  
Author(s):  
Witold Kinsner ◽  
Ron Britton ◽  
Dario Schor ◽  
Arash Fazal Darbandi ◽  
Kris Goodmanson ◽  
...  
Keyword(s):  
Extracurricular Activities ◽  
Lessons Learned ◽  
Law Students ◽  
Engineering Technology ◽  
Satellite Design ◽  
Classroom Activities ◽  
Complex Projects ◽  
Working Together ◽  
Interdisciplinary Projects ◽  
The University

The design of complex systems requires input from many disciplines including science, engineering technology, business, and law. Students from a single department are seldom exposed to interdisciplinary projects through classroom activities. Such multi-facet experience is obtained through extracurricular activities and design competitions. The Canadian Satellite Design Challenge was recently introduced to design, build, test, and launch an operational small satellite. The University of Manitoba has a team of 79 undergraduate and graduate students from several faculties, working together to design a triple pico-satellite (T-Sat).This paper presents some of the lessons learned from the first phase of the T-Sat project and insight into some of the benefits of interdisciplinary, complex projects on engineering education.

Experimental and numerical investigations of aluminium–steel self-piercing riveted joints under quasi-static and dynamic loadings

2021 ◽  
Vol 169 ◽  
pp. 108277
Author(s):  
Zhanpeng Du ◽  
Baolv Wei ◽  
Zhicheng He ◽  
Aiguo Cheng ◽  
Libin Duan ◽  
...  
Keyword(s):  
Numerical Investigations ◽  
Riveted Joints ◽  
Dynamic Loadings

In Memoriam: Tom Budzynski, Friend and Colleague

Biofeedback ◽  
2011 ◽  
Vol 39 (4) ◽  
pp. 141-145
Author(s):  
Johann Stoyva ◽  
Kirk Peffer ◽  
John Picchiottino
Keyword(s):  
Graduate Student ◽  
Clinical Studies ◽  
Aerospace Industry ◽  
Professional Life ◽  
Brain Wave ◽  
University Of Colorado ◽  
Engineering Degree ◽  
Grand Rapids ◽  
In Memoriam ◽  
The University

Tom Budzynski's background and professional life are described. Born in Grand Rapids, Michigan, Tom earned his electrical engineering degree at the University of Detroit, then worked for the aerospace industry in Southern California for several years, a period that included work on the Blackbird spy plane. Later, while a graduate student at the University of Colorado, he developed the first practical surface electromyogram feedback device, receiving his PhD in experimental psychology in 1969. In his biofeedback studies, he worked extensively with stress-related disorders, pioneering many widely used techniques. In his later years, he carried out research and clinical studies using electroencephalogram brain wave feedback. We recognize Tom both as a major innovator in biofeedback and as a great friend.

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