Abstract
Carbon-fiber-reinforced polymer (CFRP) has been widely used in aerospace structures for its high strength to weight ratio and high stiffness to weight ratio. However, current pyrotechnic separation devices are mainly made of metal materials, the cutting research on CFRP composites is limited, and the effect of weakening groove on cutting results of composites is unclear under the action of shaped charge jet. In this paper, there firstly established a three-dimensional model of explosive cutting of CFRP composites by nonlinear finite element analysis (FEA), and based on the separation time, delamination, and kinetic energy of the laminate, the influence of weakening grooves on cutting results to the laminate is discussed. The results show that, in contrast to laminates with weakening grooves, laminates without weakening grooves increase the delamination of laminates. At the same time, here, we carried out the explosive cutting test on CFRP composites to verify the rationality of the simulation model. In addition, in order to obtain a better model under the action of shaped charge jet, we optimized the width and height of weakening groove by simulation calculation. Therefore, it proves that this study can guide the application of CFRP composites subjected to shaped charge jet in aerospace separation engineering.
Highlights
Based on the background of aerospace lightweight requirements, this study uses Carbon-fiber-reinforced polymer (CFRP) composites to replace metal separation shells to improve the lightweight efficiency of the structure
It is a forward-looking study for the lightweight requirements of the entire rocket transportation system. e stable operation of the pyrotechnics separation device will be affected by the separation shells, pyrotechnics products, and some protective measures, but the factor of the separation shell plays a decisive role in the separation efficiency. erefore, this paper explores the influence of the weakening groove on the CFRP separation plate subjected to shaped charge jet. e related research work on the groove to the structure is shown as follows
In term of cutting damage of the laminate, it is clear that the laminate with the weakening grooves is cut apart and the cutting fracture is obviously neat in visual inspection, while the laminate without weakening grooves is not cut apart and shows long fibers pullout, surface shedding, and serious delamination failure
Summary
Based on the background of aerospace lightweight requirements, this study uses CFRP composites to replace metal separation shells to improve the lightweight efficiency of the structure. It is a forward-looking study for the lightweight requirements of the entire rocket transportation system. Erefore, this paper explores the influence of the weakening groove on the CFRP separation plate subjected to shaped charge jet. Efforts are made to influence the groove on the processing technology. Wang et al [3] optimized the groove texture, resulting in greater bearing capacity. Numerical optimization of texture shape of parallel surfaces under unidirectional and bidirectional sliding conditions was implemented. Numerical optimization of texture shape of parallel surfaces under unidirectional and bidirectional sliding conditions was implemented. e results showed that the best texture is chevron-shaped, with the front of one-way sliding, while the two-way sliding consists of paired trapezoidal shapes [4]
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