Study On Conforming Rectangular Tube Composites With Profile And Cracked Fabrics

Composite materials have been widely applied in the field of national defense and civilian areas and so on because of their excellent performance. They have the characteristics of light weight, high strength and modulus, corrosion resistance, easy to design and excellent mechanical property. With the development of preformed weaving technology, the narrow fabric the technology produced can make composite pipes in succession by filament winding process. Composite pipe is a kind of engineering material used widely, and it has a broad application foreground in municipal works, constructional engineering, transportation industry and so on. The cross-sections of composite pipes have all kinds of shapes and dimensions, so the thesis researched on rectangular cross-section pipe in order to guide the design and manufacture of parallel cross-section and even other composite pipes.The main research contents and results of this paper are as follows:(1) Producing preformed narrow fabric to wound rectangular cross-section composite pipes by using copying weaving technology. According to the surface meshing of needed narrow fabric, design shapes and structure parameters of preformed fabric. That can manufacture pipes in succession and fit mandrel well without clipping fabrics.(2) Remolding a weaving machine. In order to meet the weaving requirement of different length warp, it needs to remold the traditional machine. Remolding includes two parts of the machine, one is the let-off device, the other is batching roller. Remold batching roller to produce loom surface belt fabric. Sent out different length warp with remolding let-off device.(3) To obtain some conclusions, it needs two steps. The firstly, make fabric soaked with resin, then use filament winding process to get rectangular composite pipes. The secondly, test bending performance of composite pipes, then analyze the stress distribution of the sample by the finite element software.The conclusions are as follows:(1) The bending strength and modulus of samples with different woven structures are different. The samples of warp oxford weave have the highest bending strength, and samples with plain weave have the highest bending modulus.(2) With the load increasing, the stress distribution change is very small. The stress is bigger, the stress concentration phenomenon is more obvious.