二維二軸編織鋪層復(fù)合材料壓縮性能研究
[Abstract]:The braided laminated composite is often referred to as Over-braiding composites material by foreign scholars. Its application is becoming more and more extensive, and the study of its mechanical properties is one of the main problems faced by scholars at home and abroad. As one of the difficult problems in mechanical properties, compression performance is also the focus of our research. This paper mainly discusses the compressive properties of braided laminated composites. The purpose of this paper is to deduce a set of calculation methods which can describe the elastic properties of braided laminated composites or describe quantitatively the compressive properties of braided composites to a certain extent. The compression failure mode is analyzed briefly. First of all, braiding on the three-dimensional two-dimensional braiding machine, designing the size of the core die for braiding, braiding different layers of braided laminated composites, and carrying out compression tests on the MTS 647 Hydraulic Wedge Grip instrument to test the samples with different braiding layers. The compression data of braided laminated composites were obtained. Secondly, by observing the yarn direction of braided laminated composite yarn under the shape microscope, considering the buckling and undulating of the yarn at the interlaced place, the axial modulus of the fiber will be partially lost, and the coefficient 尉 of the axial modulus loss of the fiber is put forward. By measuring the basic parameters of braided composites, combining the microstructure of composites, elastic mechanics, lamination theory and multi-layer equivalent elastic mechanics model, A simple and practical method for calculating the average compression modulus of two-dimensional two-axis braided composites is derived. Finally, the compressive properties of multilayer carbon fiber / epoxy braided composites are analyzed and discussed. The variation of average compression modulus of braided laminated composites with different braiding angles and the compressive failure mode of braided laminated composites are considered. The results show that: firstly, a set of methods to calculate the compressive elastic properties of 2 脳 2 braided composite materials are presented. The results show that this method is very close to the measured results and is feasible. The method is simple and suitable for engineering applications, such as the evaluation of properties in the preparation of composite materials, the control and improvement of the preparation process of composite materials, the design of composite products and so on. Secondly, the compression tests of braided laminated composites show that: (1) when the fiber volume fraction is basically the same, if the braiding angle is different, the braiding angle will affect the compression properties of the composites. The average compression modulus with large braiding angle is small. With the increase of layer number and thickness, the average compression modulus of braided laminated composites decreases. (2) the stress-strain curve of braided laminates shows linear state before compression failure, and shows elastic deformation at the initial stage of compression. With the increase of strain, the stress rises rapidly to the highest value and reaches the highest value, and the decrease is relatively slow. (3) the main failure form of braided composite is delamination. The degree of delamination is between unidirectional laminated composites and three-dimensional braided composites. Under the same test conditions, with the increase of the number of layers, the degree of failure of the braided composite with more layers is more serious than that of the number of layers. In the same layer, the inner side with a small braiding angle is more destructive than the outer side of the braided angle. The crack is at a certain angle to the loading direction, and the crack propagation is no longer than the effective compression length.
【學(xué)位授予單位】:東華大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TB332
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