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Tensile test of carbon fibers  Measurement purpose The fracture location of carbon fiber specimens was observed and the tensile strength, modulus of elasticity, Poisson's ratio and elongation were calculated. Brief introduction of experiment Specimens with 0 degree fiber arrangement and 45 degree fiber arrangement Experimental equipment Basler 155um camera, Schneider 23mm lens, Instron experimental machine Inspection process （1）Adjusting the measuring area to 200X150mm according to the size of the specimen （2）Camera calibration （3）The system is connected with Instron experimental machine by AD to obtain the experimental mechanical signal. （4）The stretching experiment was carried out and the camera captured the image in real time. （5）Computation of data Tensile results T1-1 T1-2 T1-3 T1-4 T1-5 T1-6 T2-1 T2-2 T2-3 T2-4 T2-5 T2-6 Data processing （1）Tensile Strength: The maximum tensile force can be obtained by outputting the collected data in the software, and the tensile strength can be obtained by dividing the maximum tensile force by the cross-section area. （2）Draw the stress-strain curve between two points in the software, find the state of the elastic stage 100-500, and calculate the elastic modulus and Poisson's ratio directly in the software. （3）In the software, the elongation can be calculated by choosing two points with a distance of about 30 mm and finding the maximum value of the change of the two points. （4）Shear strength: According to the standard, shear strength can be expressed by maximum shear stress. Pm is the smaller value of pre-fracture maximum stress and 5% shear strain. （5）Shear modulus: Select the elastic stage of 100-500 state, select two pairs of horizontal and vertical points, calculate the shear modulus directly in the software. At the same time, the shear modulus also satisfies the relation G=E/2(1+mu) |