| Abstract:In the aeroengine containment test, the fan blade is required to be cut off at the root section, a method based on explosive
cutting technology was designed to meet the requirement. First of all, the cutting capability of the Flexible linear shaped charge (FLSC)
was confirmed by the static plate explosive test, and then the real fan blade static explosive test was carried out subsequently. Static
tensile test was conducted on the damaged blade after explosive cutting using an MTS tensile test machine, the residual strength of the
damaged blade was determined to be 50～56kN. According to the slot size obtained from the static explosive test, the blade was slotted at
the root section and the FLSC was fixed by resin adhesive, then explosive blade-off test under rotating conditions was conducted on a
vertical spin rig by remote control triggering. The results show that after machining a 4-mm wide slot on both sides of the fan blade and
laying the FLSC, the fan blade was cut off by FLSC at the predetermined rotational speed; The fracture surface shows that the middle part
of the blade root was cut off by metal jet of the FLSC, then the leading and trailing edge of the blade were fractured by centrifugal load, the
explosive effect did not generate additional kinetic energy on the blade, successfully achieving root fracture of the blade at the
predetermined speed. |
