Abstract:
Objectives In the application of sandwich composite materials in ship structures, in order to ensure the strength characteristics of the structure, bolt connection is usually used between the sandwich composite structure and steel main hull. However, due to the local stress concentration around the hole and the boundary effect of the connection position, the bolt connection position is usually the most dangerous position of the structure, requiring strength and fatigue checks.
Methods For a full-scale steel-sandwich composite plate frame structure, the strength characteristics of the plate frame under a 0.1 MPa uniform load are studied via the test method and finite element method.
Results By comparing the measured test results and calculated finite element results, it is found that the error between them is less than 10% and the finite element method has high calculation accuracy.
Conclusions Based on the finite element method, fatigue tests for two equivalent bolted joints are designed by means of structural stress equivalence, and the fatigue life of the steel-sandwich composite structure is checked and verified. It is found that the fatigue life of the plate structure under the design load meets the design requirement of 5 million times.
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