From the comparison of the experimental data of axial crushing, it can be seen that the peak load at the initiation angle of 60 ° is the largest, 107kN, and the load reduction after the peak load is the largest, the minimum load is 48.6kN, and the ratio of the peak load to the minimum load reaches The peak load at an initiation angle of 45 ° is only 83 kN, the minimum load is 61.1 kN, and the ratio of peak load to minimum load is 1.36. Therefore, in the initial initiation process, the effect of the initiation angle from Yin 37 on the axial crushing performance of carbon fiber / epoxy composite pipe fittings
In terms of the fluctuation amplitude of the crush curve, the fluctuation amplitude of the 45 ° trigger angle is the smallest, followed by 15 °, and the worst is 60 °. From the point of appearance of peak load, the peak load of 15 ° and 45 ° initiation angle specimens occurs before the crushing distance reaches the maximum cross-sectional area, that is, the peak load of the structure is reached at the chamfered part, and for 60 ° At the initiation angle, the peak load appears after the crushing reaches the maximum cross-sectional area. In addition, from the perspective of macro-failure mode, the failure mode of specimens with 15 ° and 45 ° initiation angles is the obvious delamination of the inner wall, while for the 60 ° initiation angle, the obvious delamination of the outer wall occurs. From the test results and macroscopic failure morphology, it is found that the initial failure caused by the 60 ° initiation angle has a high peak load, the load reduction is large, and the initial initiation effect is not ideal. The firing distance of the 15 ° firing angle is too long, which reduces the efficiency of the structure. The 45 ° initiation angle is not only a moderate peak load, but also a short initiation distance, which is more suitable for initiating initial failure.
The failure mechanism analysis of the initiation angle in the initial initiation process was given. In his analysis, the initial failure mode of shear failure of glass cloth / epoxy round pipe fittings mainly occurred, and in the steady state failure stage of energy absorbing pipe fittings The failure mode is a typical intermediate flowering failure.
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