Can you imagine that the wings of a large transport aircraft like the Y-20 will also be "broken". Recently, CCTV released the first picture, showing the Y-20 transport aircraft in the production workshop to accept the static test process, during the wing of the ultimate load test, the result of the wing directly "exploded".
From the scene picture, it can be seen that the Y-20 was "tied up with five flowers", fixed in one position, and a large number of information transmission facilities were installed on the fuselage, and after everything was ready, the pressurization test began. When the pressure reaches a certain level, the on-site personnel must be evacuated to a safe area to avoid accidents. Judging from the published load data, when the load increases to more than 100%, the wing begins to be "bent".At 110%, the wing finally could not bear it, and finally at 111% "overloaded", the wing of the Y-20 was "broken", and there was a loud "bang", and then the wing cracked.
Y-20 whole machine static test).
However, in the face of this picture, the on-site personnel cheered and applauded, and the atmosphere was very warm. Apparently, it was a satisfying experiment, and the results of the experiment reached the desired goal.
Why do you celebrate when the wings "burst"?In fact, this is to test the load capacity of the aircraft under the optimal design state, if the upper load limit of the aircraft is 100%, then in order to be safe, it must be ensured that the ultimate load is between 100% and 120%, so that there is an additional safety guarantee. But it should not be too high, because too high means that the fuselage is too strong, and the materials used may be too thick, ignoring the indicator of aircraft lightweight.
Weight reduction has always been an important requirement for aircraft, and ideally the fuselage design is as light as possible to achieve maximum load capacity, and there is a trade-off between this. The Y-20 test tested this balance. The Y-20 wing broke when the load was 111%, indicating that the design just met the requirements of the range of 100% to 120%, so the on-site design engineers would be thunderous.
Y-20) This experimental result also illustrates two achievements, one is that our Y-20 is indeed an excellent performance transport aircraft, which can withstand the requirements of a strict test environment;The second is that China already has a systematic aircraft test system, which can carry out various high-precision test work on Y-20 and other models.
The Y-20 after the "big keg" was replaced).
In fact, not only the Y-20 transport aircraft, but also the C919 large passenger aircraft are also subject to static tests. From 2016 to 2017, the C919 static testing machine underwent rigorous testing in the production hall for more than 300 days, including 48 items, including load tests on the aircraft's wings. Under the action of high load pressure, the wing tip part of the C919 even showed a deformation of more than 3 meters. After ensuring that all tests were met, the C919 made its maiden flight in 2017.
C919 test site).
Whether it is the Y-20 transport aircraft or the C919 large passenger aircraft, they all reflect China's high-level aviation technology development achievements. These achievements have also laid a solid foundation for the development of more new domestic aircraft in the future.