Mechanical Properties Of Glass Fiber Reinforced Plastic Honeycomb And Its Application In Wind Turbine Blade

For disadvantages of complicated preparation technique and difficult industrialization stick glass steel honeycomb panel, the%type structure of glass steel honeycomb panel is put forward creatively. The mechanical properties of honeycomb panel is researched by coordinate vector transform in combination with numerical calculation, and the methods is proved by test. The structure of total wind turbine blade’s cross section and skin are same as composition of honeycomb panel. On the basis of test and finite element calculation, the honeycomb panel applied to turbine blade is researched. The conclusion is as follows:1. For thin panel of resin enhanced by one-way glass fiber tensiled along fiber axis, both ends of fiber interface have stress concentration; Along fiber’s length embedded in rensin increased, stress concentration at both ends of fiber’s intergace is receded, and stress of fiber’s interface is tend to homogenization; interfacial bonding strength between fiber and resin has an important effect on stress distribution of fiber’s interface. The nine elastic mechanic parameters of thin panel is Yong’s Modulus: E1=64.27GPa,E2=E3=10.3GPa, Poisson Ration:v12=v13=0.224, v23=0.092,Shear Modulus:G12=G13=5.14GPa, G23=4.02GPa。2. Two deformation stages are elastic deformation stage and fracture stage-in flat ptress deformation of isosceles-trapezoid honeycomb core of glass steel sandwich panel. The yielding mode deformation as t1/h which is very big, while the bucking mode deformation as t1/h which is very small. The part2 in the honeycomb core is main bearing part for honeycomb panel, and the part2 is supported by the part1 and part3 in honeycomb core, while the honeycomb core is supported by the panel. So, the part2’s cell wall thickness has strong influence on flat press strength of honeycomb panel, the honeycomb core’s cell wall side length, and the part1 and part3’s cell wall thickness in honeycomb core and panel’s thickness have a weak influence. Fixed other conditions, the flat press strength of honeycomb panel gradually increases along with increasing honeycomb core layers.3. The side press damage way of isosceles-trapezoid honeycomb core of glass steel sandwich panel has three types which is broken panel buckling honeycomb panel and separation between panel and honeycomb core. The panel is main load bearing component of side press honeycomb panel, the honeycomb core is used to support panel. So, the structural and material parameters for panel have a great influence on compressive strength of broken panel and load stress of buckling honeycomb panel. The structural and material parameters for honeycomb core has a small influence on compressive strength of broken panel, but the individual structural parameters of honeycomb core has a great influence on load stress of buckling honeycomb panel. Fixed other conditions, the compressive strength of broken panel and load stress of buckling honeycomb panel gradually increases along with the increasing cell bodies of honeycomb core.4. The three points bending damage way of isosceles-trapezoid honeycomb core of glass steel sandwich panel has two types which are bucking instability of honeycomb panel and interface separation between panel and honeycomb core. The most likely buckling and interfacial unstuck location of top and bottom panel respectively have asynchrony and separation feature. The loading surface’s panel easily has buckling instability, and the interfacial location of bearing surface’s panel and honeycomb core easily has separation. The performance balance between panel and honeycomb core has an important influence on damage way of honeycomb panel. The damage way of interface separation between panel and honeycomb core can be changed to damage way of buckling instability of honeycomb panel when enhancing honeycomb core’s performance but reducing panel’s performance. The panel is main bearing component of buckling honeycomb panel, the honeycomb core is used to support panel. So, the structural and material parameters for panel have a great influence on load stress of buckling honeycomb panel, and the structural and material parameters for honeycomb core have a small influence on load stress of buckling honeycomb panel. Fixed other conditions, the load stress of buckling honeycomb panel is improved along with honeycomb core layers increased. The outermost layer’s panel has a higher sensitivity on load stress of buckling honeycomb panel than other location’s panel. The load stress of buckling honeycomb panel gradually increases along with the increasing honeycomb core layers. Relative to inner panels, outermost panels have a higher sensitivity for multilayer isosceles-trapezoid honeycomb core of glass steel sandwich panel. The improvement of bonding intensity between panel and honeycomb core can significantly enhance fatigue life of honeycomb panel.5. In fact, the double equations turbulence standard model of k-s and k-w can provide accurate fluid pressure load for Fluid-Solid coupling analysis of wind turbine blade. The separation location of blade cann’t be at two-thirds and middle location, it shouble be at one-thirds location. The interface between one-way glass fiber and resin should be distinguishingly processed to make radial normal stress be compressive stress, it can enhanced interfacial bond strength between fiber and resin to improve mechanical conection strength at separation location. The beam cap is mainly bearing component which bears shear force along the axis of blade. The web palte is used to support beam cap, it firstly limits displacement along the axis of balde, the second limit displacement along normal direction of beam cap, the last limit displacement along horizontal direction of beam cap. We should select beam cap in separation location’s cross section of blade as mian mechanical conection object to make intensively mechanical conection along the axis of blade, don’t select web plate as main mechanical conection object. But we may select web palte as auxiliary mechanical conection object to make beam cap supported largrly, it can promote mechanical connection design security at separation location of blade. The design principles for, firstly enhance displacement limit design along the axis of balde, the second displacement limit design along normal direction of beam cap, the last displacement limit desin along horizontal direction of beam cap. Furthermore, the front enhanced layer and back enhanced layer bear partial load, we may select them as auxiliary mechanical conection object to make mechanical connection along the axis of blade.For disadvantages of the complicated preparation technique and difficult industrialization of stick glass steel honeycomb panel, the innovation of this paper maily reflects in proposing that the π type structure glass steel honeycomb panel is put foreard creatively. The mechanical properties of honeycomb panel is researched newly by coordinate vetor transform in combination with numerical calculation. For the structure of total wind turbine blade’s cross section and skin with the same as composition of honeycomb panel, the reducing weight design of segmented blade and shin using honeycomb panel is researched on the basis of honeycomb panel’s mechanical properties.