The deformation behavior of a multi-layered aluminum corrugated structure at increasing impact velocities için kapak resmi
The deformation behavior of a multi-layered aluminum corrugated structure at increasing impact velocities
Başlık:
The deformation behavior of a multi-layered aluminum corrugated structure at increasing impact velocities
Yazar:
Sarıkaya, Mustafa Kemal, author.
Fiziksel Tanımlama:
xii, 103 leaves: illustrarions, charts;+ 1 computer laser optical disc.
Özet:
The compression impact deformation of a layered 1050 H14 aluminum corrugated sandwich structure was determined both experimentally and numerically under low, intermediate and high velocities to investigate the validity of the perfect and imperfect models. Three-dimensional finite element models of the tested specimens were developed using the LS-DYNA. At increasing velocities from quasi-static velocity to 200 m s-1, the tested corrugated structures showed three distinct deformation modes: between 0.0048 and 22 m s-1 the deformation was quasi-static homogenous mode; between 22 and 60 m s-1 a transition mode and above 90 m s-1 a shock mode. These observations were also confirmed by the camera records and model layer strain profiles. The imperfect models predicted the deformation behavior in homogeneous and transition modes, while the imperfect and perfect models both well predicted the shock mode. Layer strain profiles showed that as the velocity increased, the crushed layer densification strains increased. The numerical models and experiments of direct impact tests showed that distal end crushing stress increased with increasing velocity. The increase of the stress within the homogeneous and transient mode velocities was ascribed to the micro-inertia effect and the tested corrugated structure showed a Type II behavior. The rigid perfectly plastic locking (r-p-p-l) model prediction using quasi-static plateau stress and densification strain and quasi-static plateau stress and numerically determined densification strain at that specific velocity resulted higher velocities and full densification, while the r-p-p-l model based on varying plateau stress and densification strain well predicted in the shock mode.
Yazar Ek Girişi:
Tek Biçim Eser Adı:
Thesis (Master)--İzmir Institute of Technology: Mechanical Engineering.

İzmir Institute of Technology: Mechanical Engineering--Thesis (Master).
Elektronik Erişim:
Access to Electronic Versiyon.
Ayırtma: Copies: