Numerical design optimization of the fiber orientation of glass/phenolic composite tubes based on tensile and radial compression tests

2021 ◽  
pp. 114898
Author(s):  
Maha Hussein Abdallah ◽  
Abass Braimah
Keyword(s):  
Design Optimization ◽  
Fiber Orientation ◽  
Radial Compression ◽  
Compression Tests ◽  
Composite Tubes ◽  
Numerical Design ◽  
Phenolic Composite

Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce

Holzforschung ◽  
2017 ◽  
Vol 71 (6) ◽  
pp. 505-514 ◽  
Author(s):  
Carolina Moilanen ◽  
Tomas Björkqvist ◽  
Markus Ovaska ◽  
Juha Koivisto ◽  
Amandine Miksic ◽  
...  
Keyword(s):  
Strain Rate ◽  
Linear Model ◽  
Norway Spruce ◽  
Material Model ◽  
Radial Compression ◽  
Compression Tests ◽  
Static Compression ◽  
Rate Dependent ◽  
Compression Model ◽  
Wood Compression

Abstract A dynamic elastoplastic compression model of Norway spruce for virtual computer optimization of mechanical pulping processes was developed. The empirical wood behaviour was fitted to a Voigt-Kelvin material model, which is based on quasi static compression and high strain rate compression tests (QSCT and HSRT, respectively) of wood at room temperature and at high temperature (80–100°C). The effect of wood fatigue was also included in the model. Wood compression stress-strain curves have an initial linear elastic region, a plateau region and a densification region. The latter was not reached in the HSRT. Earlywood (EW) and latewood (LW) contributions were considered separately. In the radial direction, the wood structure is layered and can well be modelled by serially loaded layers. The EW model was a two part linear model and the LW was modelled by a linear model, both with a strain rate dependent term. The model corresponds well to the measured values and this is the first compression model for EW and LW that is based on experiments under conditions close to those used in mechanical pulping.

Evaluation of sandwich panels with composite tube-reinforced foam core under bending and flatwise compression

2018 ◽  
Vol 22 (2) ◽  
pp. 480-493 ◽  
Author(s):  
Kenan Cinar
Keyword(s):  
Thermal Conductivity ◽  
Sandwich Structure ◽  
Bending Stiffness ◽  
Core Material ◽  
Foam Core ◽  
Compression Tests ◽  
Composite Tubes ◽  
Low Thermal Conductivity ◽  
Compression Performance ◽  
Compression Properties

In some applications such as roofs and walls, it is important to supply low thermal conductivity and high bending stiffness to structures. Generally, foam materials are preferred, which have low thermal conductivity. However, bending stiffness and compression properties of foam materials are low. In this study, composite tubes were inserted to the foam core material to improve the compression and bending properties of the sandwich structure. Vacuum infusion method was used to manufacture the sandwich structure. The bending and compression performance of the structures with and without composite tubes were compared. To measure the bending stiffness and compression properties of the structure, three-point bending and compression tests were conducted according to American Society for Testing and Materials (ASTM) standards. The manufacturing procedure can be easily automated and applied to large and complex shape panels. In addition, a parametric analysis was done to investigate the effect of the number of tubes and the diameter of the tubes on bending and compression stiffness of the structure. According to the test results, the samples including the composite tubes gave six times higher bending stiffness as compared to the samples without the composite tubes. As the diameter of the tubes increased the bending stiffness and the ultimate core shear strength increased. In addition, the structures including 14 mm diameter tubes had higher specific absorbed energy values under compression loading.

Further Improvements in the SNUF Blade Design by Numerical Design Optimization Framework

2018 ◽  
Vol 31 (1) ◽  
pp. 04017081
Author(s):  
WonJong Eun ◽  
JiSoo Sim ◽  
SangWoo Lee ◽  
SangJoon Shin
Keyword(s):  
Design Optimization ◽  
Blade Design ◽  
Optimization Framework ◽  
Numerical Design

Effect of Basalt Intraply Fiber Hybridization on the Compression Behavior of Filament Wound Composite Pipes

2021 ◽  
Vol 36 (2) ◽  
pp. 193-204
Author(s):  
Ö. Özbek ◽  
Ö. Y. Bozkurt ◽  
A. Erkliğ
Keyword(s):  
Axial Compression ◽  
Compression Strength ◽  
Basalt Fiber ◽  
Radial Compression ◽  
Compression Tests ◽  
Compression Behavior ◽  
Compression Properties ◽  
Fiber Winding ◽  
Composite Pipes ◽  
Hybrid Carbon

Abstract The current study deals with the effect of basalt fiber hybridization on the compressive properties of composite pipes reinforced with glass fiber and carbon fiber. Hybrid and non-hybrid fiber reinforced pipes (FRPs) were fabricated through wet filament winding technique. Intraply fiber winding structure in which different fiber types were simultaneously wound at the layer was employed for the hybridization. The FRP samples wound by different fiber winding angles (± (40°), ± (55°), ± (70°)) were prepared in order to gain a better insight on the influence of basalt intraply fiber hybridization. The compression properties of FRP samples were experimentally determined by quasi-static compression tests using external parallel-plates for both the axial and radial directions. The non-hybrid carbon FRP pipes showed the maximum axial compression strength in parallel to the highest strength and lowest ductility of carbon fibers, while the minimum axial compression strength was obtained for the non-hybrid pipes reinforced with basalt fibers that, in comparison, exhibit much less strength and higher ductility. The pipes submitted to the axial compression tests predominantly failed due to the development of cracks and buckling along the fiber direction. While the inclusion of basalt fiber reduced the axial compression behavior of the non-hybrid carbon and glass FRP samples, it improved that behavior in the radial compression tests. Delamination was determined as the major failure mode for the damaged FRPs under radial compression. It is found that the incorporation of basalt fiber provides improvements in radial compression properties as opposed to axial compression properties and in the same manner the increment in fiber winding angle makes a positive contribution to radial compression properties.

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