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9 Result(s)

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  1. No Access

    Chapter and Conference Paper

    Deep Rolling for Tailoring Residual Stresses of AA2024 Sheet Metals

    Deep Rolling as a well-known mechanical surface treatment process is investigated with the objective to tailor residual stress profiles over the sheet metal thickness. Experiments are performed in a milling po...

    Jonas Lehmann, Sören Keller, Fabian Esterl… in Proceedings of the 14th International Conf… (2024)

  2. No Access

    Chapter and Conference Paper

    A Modeling Approach for the Fatigue Behavior of Laser Drilled Micro Perforated Structural Panels

    With hybrid laminar flow control the drag can be reduced for airfoils. This is done by boundary layer suction through millions of small holes in the skin panels. The goal of this paper is to assess the impact ...

    Dort Daandels, Stefan Riekehr… in ICAF 2019 – Structural Integrity in the Ag… (2020)

  3. No Access

    Chapter and Conference Paper

    Probabilistic Reliability Assessment of a Component in the Presence of Internal Defects

    Structural strength may degrade during the service life of an aircraft due to undetected material defects or accidental damages. Additively manufactured or welded structures are particularly susceptible to fat...

    Fedor Fomin, Nikolai Kashaev in ICAF 2019 – Structural Integrity in the Ag… (2020)

  4. No Access

    Chapter and Conference Paper

    Fatigue Crack Propagation Influenced by Laser Shock Peening Introduced Residual Stress Fields in Aluminium Specimens

    Laser Shock Peening (LSP) enables the generation and modification of residual stresses deep below the surface of metallic components. LSP-induced residual stress profiles provide penetration depths of compress...

    Sören Keller, Manfred Horstmann… in ICAF 2019 – Structural Integrity in the Ag… (2020)

  5. No Access

    Article

    Phase Transformations During Solidification of a Laser-Beam-Welded TiAl Alloy—An In Situ Synchrotron Study

    An in situ highly time-resolved, high-energy X-ray diffraction investigation was carried out to observe the phase transformations of a TiAl alloy during laser beam welding. The diffraction patterns are recorded e...

    Jie Liu, Peter Staron, Stefan Riekehr… in Metallurgical and Materials Transactions A (2016)

  6. No Access

    Article

    Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy

    The microstructure, chemical composition, residual stress, and lattice parameter evolution of the welding zone (WZ) and heat-affected zone (HAZ) of a laser-beam-welded TiAl-based alloy were investigated. It wa...

    Jie Liu, Peter Staron, Stefan Riekehr… in Metallurgical and Materials Transactions A (2016)

  7. Article

    Open Access

    Process Optimization of Dual-Laser Beam Welding of Advanced Al-Li Alloys Through Hot Cracking Susceptibility Modeling

    Laser welding of advanced Al-Li alloys has been developed to meet the increasing demand for light-weight and high-strength aerospace structures. However, welding of high-strength Al-Li alloys can be problemat...

    Yingtao Tian, Joseph D. Robson… in Metallurgical and Materials Transactions A (2016)

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  8. No Access

    Article

    Laser Weldability of High-Strength Al-Zn Alloys and Its Improvement by the Use of an Appropriate Filler Material

    Heat-treatable Al-Zn alloys are promising candidates for use as structural lightweight materials in automotive and aircraft applications. This is mainly due to their high strength-to-density ratio in compariso...

    Josephin Enz, Stefan Riekehr, Volker Ventzke… in Metallurgical and Materials Transactions A (2016)

  9. No Access

    Article

    Effect of Post-weld Heat Treatment on Microstructure and Mechanical Properties of Laser Beam Welded TiAl-based Alloy

    Post-weld heat treatment is carried out on the laser beam welded γ-TiAl-based alloy Ti-48Al-1Cr-1.5Nb-1Mn-0.2Si-0.5B (at. pct). The macro/microstructure and mechanical properties of both as-welded and heat-treate...

    Jie Liu, Volker Ventzke, Peter Staron… in Metallurgical and Materials Transactions A (2014)