In this study, the effect of stitch pattern on the impact and post impact (CAI) behavior of eight... more In this study, the effect of stitch pattern on the impact and post impact (CAI) behavior of eight ply woven-knit hybrid composite plates consisting of 2D woven fabrics as outer layers and rib knitted fabrics as inner layers was investigated. Layers of the woven-knit hybrid composite plates were sewed in circular, square and diamond shape through thickness in order to prevent delamination and slippage between the layers. Impact and post impact testing were carried out in order to determine the impact and post impact resistance of three different stitched composite structures. Results showed that the impact strength of composite laminate increased 5.5%, 11% and 22% in the case of square, diamond, and circular stitching, respectively. It was also found that the woven-knit hybrid composites with square pattern have the highest CAI strength. j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c o m p s t r u c t 25 J Front 25 J Back CAI damage Impact damage 45 J Front CAI damage Impact damage 45 J Back 50 J Front CAI damage Impact damage 50 J Back Fig. 14. The CAI damage of the woven-knit hybrid composites with square stitch pattern at 25 J (a), 45 J (b), and 50 J (c). A. Aktas ß et al. / Composite Structures 116 (2014) 243-253
... 1258C) was Correspondence to: Mehmet Aktas; e-mail: [email protected]. tr Contract grant ... more ... 1258C) was Correspondence to: Mehmet Aktas; e-mail: [email protected]. tr Contract grant sponsor: Scientific and Technological Research Council of Turkey (TU¨ B˙ITAK); contract grant number: 104M426. DOI 10.1002 ...
Journal of Thermoplastic Composite Materials, 2011
ABSTRACT: The aim of this study is to investigate the experimental and numerical characterization... more ABSTRACT: The aim of this study is to investigate the experimental and numerical characterizations of the glass/epoxy composite plates at room temperature (approximately 208C) and high temperatures (408C, 608C, 808C, and 1008C). Two stacking sequences were selected as [0/90/0/90]S ...
This study presents the effects of impact energy, impactor mass and impact velocity on the maximu... more This study presents the effects of impact energy, impactor mass and impact velocity on the maximum contact force, maximum deflection, contact time, absorbed energy, and overall damage area of glass/ epoxy laminated composites, experimentally and numerically. The stacking sequence of the composite plates was chosen as [0°/30°/60°/90°] S . The impact event was simulated and analyzed by using 3DIM-PACT finite element code. The overall delamination area obtained from experimental study and numerical analyses were also examined. It is seen that the numerical results are in good agreement with experimental results.results.
Mechanical joining and adhesive bonding provide convenience for manufacturing of complex structur... more Mechanical joining and adhesive bonding provide convenience for manufacturing of complex structures, which made of composite materials. Failure load is directly related with process parameters of mechanical joining or adhesive bonding. In this study, the effects of bonding angle, patching type (single side and double side) and patching structure on the failure load were investigated in the pultruded composite specimens. For this aim, the pultruded composite specimens, which bonded with five different bonding angles (45, 51, 59, 68 and 90) and five different bonding types as unpatched, single-side woven patch, single-side knitting patch, double-side woven patch and double-side knitting patch were exposed to tensile loads at room temperature. In the view of experimental results, the failure loads of bonded pultruded composite specimens were predicted by training six different artificial neural network algorithms. The only three best prediction results of Bayesian regularization, Levenberg–Marquardt and scaled conjugate gradient were given in the figures for better understanding.
In this study, the impact behavior of laminated glassepoxy composites at several temperatures (2... more In this study, the impact behavior of laminated glassepoxy composites at several temperatures (20 °C, −20 °C and −60 °C) was studied experimentally. Impact tests were performed by using Fractovis Plus impact test machine with a constant impactor mass of 5.02 kg. Composite ...
In this study, the effect of stitch pattern on the impact and post impact (CAI) behavior of eight... more In this study, the effect of stitch pattern on the impact and post impact (CAI) behavior of eight ply woven-knit hybrid composite plates consisting of 2D woven fabrics as outer layers and rib knitted fabrics as inner layers was investigated. Layers of the woven-knit hybrid composite plates were sewed in circular, square and diamond shape through thickness in order to prevent delamination and slippage between the layers. Impact and post impact testing were carried out in order to determine the impact and post impact resistance of three different stitched composite structures. Results showed that the impact strength of composite laminate increased 5.5%, 11% and 22% in the case of square, diamond, and circular stitching, respectively. It was also found that the woven-knit hybrid composites with square pattern have the highest CAI strength. j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c o m p s t r u c t 25 J Front 25 J Back CAI damage Impact damage 45 J Front CAI damage Impact damage 45 J Back 50 J Front CAI damage Impact damage 50 J Back Fig. 14. The CAI damage of the woven-knit hybrid composites with square stitch pattern at 25 J (a), 45 J (b), and 50 J (c). A. Aktas ß et al. / Composite Structures 116 (2014) 243-253
... 1258C) was Correspondence to: Mehmet Aktas; e-mail: [email protected]. tr Contract grant ... more ... 1258C) was Correspondence to: Mehmet Aktas; e-mail: [email protected]. tr Contract grant sponsor: Scientific and Technological Research Council of Turkey (TU¨ B˙ITAK); contract grant number: 104M426. DOI 10.1002 ...
Journal of Thermoplastic Composite Materials, 2011
ABSTRACT: The aim of this study is to investigate the experimental and numerical characterization... more ABSTRACT: The aim of this study is to investigate the experimental and numerical characterizations of the glass/epoxy composite plates at room temperature (approximately 208C) and high temperatures (408C, 608C, 808C, and 1008C). Two stacking sequences were selected as [0/90/0/90]S ...
This study presents the effects of impact energy, impactor mass and impact velocity on the maximu... more This study presents the effects of impact energy, impactor mass and impact velocity on the maximum contact force, maximum deflection, contact time, absorbed energy, and overall damage area of glass/ epoxy laminated composites, experimentally and numerically. The stacking sequence of the composite plates was chosen as [0°/30°/60°/90°] S . The impact event was simulated and analyzed by using 3DIM-PACT finite element code. The overall delamination area obtained from experimental study and numerical analyses were also examined. It is seen that the numerical results are in good agreement with experimental results.results.
Mechanical joining and adhesive bonding provide convenience for manufacturing of complex structur... more Mechanical joining and adhesive bonding provide convenience for manufacturing of complex structures, which made of composite materials. Failure load is directly related with process parameters of mechanical joining or adhesive bonding. In this study, the effects of bonding angle, patching type (single side and double side) and patching structure on the failure load were investigated in the pultruded composite specimens. For this aim, the pultruded composite specimens, which bonded with five different bonding angles (45, 51, 59, 68 and 90) and five different bonding types as unpatched, single-side woven patch, single-side knitting patch, double-side woven patch and double-side knitting patch were exposed to tensile loads at room temperature. In the view of experimental results, the failure loads of bonded pultruded composite specimens were predicted by training six different artificial neural network algorithms. The only three best prediction results of Bayesian regularization, Levenberg–Marquardt and scaled conjugate gradient were given in the figures for better understanding.
In this study, the impact behavior of laminated glassepoxy composites at several temperatures (2... more In this study, the impact behavior of laminated glassepoxy composites at several temperatures (20 °C, −20 °C and −60 °C) was studied experimentally. Impact tests were performed by using Fractovis Plus impact test machine with a constant impactor mass of 5.02 kg. Composite ...
Uploads
Papers by mehmet aktas
composite materials. Failure load is directly related with process parameters of mechanical joining or adhesive bonding.
In this study, the effects of bonding angle, patching type (single side and double side) and patching structure on the failure
load were investigated in the pultruded composite specimens. For this aim, the pultruded composite specimens, which
bonded with five different bonding angles (45, 51, 59, 68 and 90) and five different bonding types as unpatched,
single-side woven patch, single-side knitting patch, double-side woven patch and double-side knitting patch were exposed
to tensile loads at room temperature. In the view of experimental results, the failure loads of bonded pultruded
composite specimens were predicted by training six different artificial neural network algorithms. The only three best
prediction results of Bayesian regularization, Levenberg–Marquardt and scaled conjugate gradient were given in the
figures for better understanding.
composite materials. Failure load is directly related with process parameters of mechanical joining or adhesive bonding.
In this study, the effects of bonding angle, patching type (single side and double side) and patching structure on the failure
load were investigated in the pultruded composite specimens. For this aim, the pultruded composite specimens, which
bonded with five different bonding angles (45, 51, 59, 68 and 90) and five different bonding types as unpatched,
single-side woven patch, single-side knitting patch, double-side woven patch and double-side knitting patch were exposed
to tensile loads at room temperature. In the view of experimental results, the failure loads of bonded pultruded
composite specimens were predicted by training six different artificial neural network algorithms. The only three best
prediction results of Bayesian regularization, Levenberg–Marquardt and scaled conjugate gradient were given in the
figures for better understanding.