A Simplified Stress-Calculation for Each Layer and Stacking-Sequence Optimization Method in CFRP- COPV Cylindrical Part

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In this study, an optimization method was developed to mini-mize the thickness of the cylindrical part of a carbon fiber reinforced plastic (CFRP)-composite overwrapped pressure vessel (COPV). This study extends the stress calculation equation of a pressure vessel with two layers subjected to internal pressure to multiple layers. This approach allowed the approximation of stress in each layer of the COPV with arbitrary stacking sequences and numbers of layers, reducing the computational costs. In this calculation method, only the strength of the cylindrical part of the COPV was considered. The stacking sequence was optimized to minimize the vessel thickness and maximum stress in the fiber direction under the condition that the inner diameter and thickness of a CFRP layer were constant. The optimization results show that the proposed method is reasonable because the stacking sequence is thinner than the existing tank stacking sequence. This omits the low-angle helical layer necessary to fabricate the dome part. Using the proposed method, we determined the possibility of optimizing the stacking sequence under arbitrary limiting conditions at a low computational cost. This study enables adding the allowable pressure for each damage mode (matrix cracking and fiber failure) to the limiting conditions or method optimization considering the strength development rate of fiber.

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  • 圧力技術

    圧力技術 62 (1), 4-27, 2024

    一般社団法人 日本高圧力技術協会

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