Objective This paper aims to explore the shock response law of ship-borne equipment with cracks under the impact load of underwater non-contact explosion.

Method Taking the compressor component of a certain type of shipborne gas turbine as the research object, an impact resistance test of the crack-free compressor is carried out. A time-domain simulation method based on the cohesive element is then proposed to study the impact response law of the cracked compressor.

Results The results show that the support legs are the weak links of the compressor. When a single support leg fractures, the stress peaks of the casing and shaft structures increase by 16.08% and 17.06% respectively compared to those without cracks, and the stress peak of the support structure of the compressor reaches 215 MPa. When multiple support legs fracture, the changes of the casing and shaft structures with the number of broken support legs are not obvious, but the stress peak of the support structure first increases and then decreases with the number of broken support legs. When two legs of the compressor crack simultaneously, the stress response is the greatest, with a peak value of 282 MPa.

Conclusion The results of this study have important guiding significance for research on the shock response laws of shipborne equipment with cracks.