DYNAMIC MECHANICAL PROPERTY STUDY OF BREAK RINGS IN FLEXIBLE PROTECTIVE SYSTEM

Break rings are important energy dissipation components in a flexible protective system, which plays a key role in energy dissipation and over-load protection for the system. The single break ring and the break rings groups of GS-8002 are conducted on quasi-static tests, on the dynamic tests based on weights, and on full-scale impact tests. And then the deformation and mechanical characteristics of the break rings in different test conditions are analyzed. It is shown that:under the influence of the dynamic load, the staring force increases, the parallel break rings group had the largest increase. The tensile strength curve of the break rings has obvious pulse characteristics. The series break rings group is more prominent. The deformation of break ring near the side of the whole system is relatively large, and which near the fixed end is small. The pulse characteristics of parallel break rings groups is similar to that of the single. Then a four-line mechanical model of the break ring considering the dynamic characteristics is proposed, which can better reflect the working performance characteristics of break rings. Based on those analysis models, the equivalent relation is developed between the performance indexes of GS-8002 in different test conditions, which is convenient for the design and application in pertinent practical engineering.