An Optimal Design Method for Off-Axis Tensile Test Specimens of Unidirectional Ceramic Matrix Composites
A composite material, tensile test technology, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve the problems of low success rate, insufficient, not fully revealing the evolution law of matrix fibers, etc., to improve the success rate , Uniform stress, reducing the effect of deformation of the test piece
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[0113]Take the off-axis angle θ=3 degrees as an example. The stress distribution of the unoptimized 3-degree off-axis test piece and the optimized stress distribution of the 3-degree off-axis test piece were modeled and calculated in ANSYS. The results are attached Figure 3-6 shown in . Different colors in the figure represent different stress magnitudes, and the lighter the color of the test section, the greater the stress value.
[0114] Compared image 3 and Figure 5 It can be seen that the fiber axial stress of the unoptimized 3-degree off-axis test piece is approximately parallelogram, indicating that the stress distribution is uneven, and the fracture may not appear in the test section, which may lead to test failure; while the optimized 3-degree off-axis test piece The axial stress of the fiber in the shaft test piece is approximately rectangular, indicating that the stress distribution is relatively uniform, which reduces the probability of test failure.
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