Browsing by Author "Allegri, Giuliano"

Browsing by Author "Allegri, Giuliano"

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  • Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination 
    Cui, Hao; Yasaee, Mehdi; Kalwak, Gordon; Pellegrino, Antonio; Partridge, Ivana K.; Hallett, Stephen R.; Allegri, Giuliano; Petrinic, Nik (Elsevier, 2017-04-13)
    Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode ...
  • Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates 
    Mohamed, Galal; Allegri, Giuliano; Yasaee, Mehdi; Hallett, Stephen R. (Elsevier, 2017-03-26)
    Z-pins are an effective method of reinforcing laminated composite materials for resisting the propagation of delamination. In this paper, a novel numerical method combines the classical cohesive finite element (FE) method ...
  • Coupon scale Z-pinned IM7/8552 delamination tests under dynamic loading 
    Cui, Hao; Mahadik, Yusuf; Hallett, Stephen R.; Partridge, Ivana K.; Allegri, Giuliano; Ponnusami, Sathiskumar A.; Petrinic, Nik (Elsevier, 2019-08-01)
    Dynamic impact onto laminated composite structures can lead to large-scale delamination. This can be mitigated by the introduction of through-thickness reinforcement, such as z-pins. Here, mode I & II and mixed-mode ...
  • Design and Modeling of Selective Reinforcements for Integral Aircraft Structures 
    Boscolo, M.; Allegri, Giuliano; Zhang, Xiang (American Inst of Aeronautics and Astronautics, 2008-09-01)
    A numerical simulation is presented in this paper on the performance of crack retarders bonded to integral metallic structures. The work is described in two main parts. First, a novel modeling approach employing the ...
  • Dynamic bridging mechanisms of through-thickness reinforced composite laminates in mixed mode delamination 
    Cui, Hao; Yasaee, Mehdi; Hallett, Stephen R.; Partridge, Ivana K.; Allegri, Giuliano; Petrinic, Nik (Elsevier, 2017-11-23)
    Delamination resistance of composite laminates can be improved with through-thickness reinforcement such as Z-pinning. This paper characterises the bridging response of individual carbon fibre/BMI Z-pins in mixed mode ...
  • Dynamic bridging response of through-thickness reinforcement in composite laminates 
    Cui, Hao; Melro, António R.; Mahadik, Yusuf; Yasaee, Mehdi; Allegri, Giuliano; Partridge, Ivana K.; Hallett, Stephen R.; Petrinic, Nik (International Committee on Composite Materials, 2017-12-31)
    The present experimental study aims to extend the understanding of delamination crack bridging mechanisms in Z-pinned laminates subjected to highly dynamic loading conditions. The bridging response of single Z-pins was ...
  • Efficient computational techniques for mistuning analysis of bladed discs: A review 
    Yuan, Jie; Scarpa, Fabrizio; Allegri, Giuliano; Titurus, Branislav; Patsias, Sophoclis; Rajasekaran, Ramesh (Elsevier, 2016-11-06)
    This paper describes a review of the relevant literature about mistuning problems in bladed disc systems, and their implications for the uncertainty propagation associated to the dynamics of aeroengine systems. An emphasis ...
  • Fail-Safe Design of Integral Metallic Aircraft Structures Reinforced by Bonded Crack Retarders 
    Zhang, Xiang; Boscolo, M.; Figueroa-Gordon, Douglas J.; Allegri, Giuliano; Irving, Phil E. (Elsevier Science B.V., Amsterdam., 2009-01-01)
    This paper presents an investigation on the effectiveness of crack growth retarders bonded to integral metallic structures. The study was performed by both numerical modelling and experimental tests. It focuses on aluminium ...
  • Novel frame model for mistuning analysis of bladed disc systems 
    Yuan, Jie; Scarpa, F.; Titurus, B.; Allegri, Giuliano; Patsias, S.; Rajasekaran, R. (American Society of Mechanical Engineers (ASME), 2017-03-06)
    The work investigates the application of a novel frame model to reduce the computational cost of the mistuning analysis of bladed disc systems. A full-scale finite element (FE) model of the bladed disc is considered as ...
  • On the delamination self-sensing function of Z-pinned composite laminates 
    Zhang, B.; Allegri, Giuliano; Yasaee, Mehdi; Hallett, Stephen R.; Partridge, Ivana K. (Elsevier, 2016-03-19)
    This paper investigates for the first time the usage of through-thickness reinforcement for delamination detection in self-sensing composite laminates. Electrically conductive T300/BMI Z-pins are considered in this study. ...
  • On the delamination suppression in structural joints by Z-fibre pinning 
    Allegri, Giuliano; Zhang, Xiang (Elsevier Science B.V., Amsterdam., 2007-04-01)
    The main objective of this paper is to investigate the benefits of Z-fibre pinning to improve the bonding strength of composite joints. The problem is addressed from a design point of view in order to develop a ...
  • On the inverse power laws for accelerated random fatigue testing 
    Allegri, Giuliano; Zhang, Xiang (Elsevier Science B.V., Amsterdam., 2008-06-01)
    This paper addresses the usage of inverse power laws in accelerated fatigue testing under wide-band Gaussian random loading. The aim is not at predicting an absolute value of fatigue life but assessing the fatigue damage ...