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7:15 PM  January 6, 2020

TSU scientists find "Achilles' heels" of titanium structures

© ТГУTSU scientists find Achilles' heels of titanium structures

TOMSK, Jan 6 – RIA Tomsk. Scientists of the Faculty of Physics and Engineering of Tomsk State University found out how various holes in titanium alloys reduce their strength under a sharp load, the university’s press service reports; it is specified that results of experiments will help to avoid accidents, for example, when an aircraft landing or operating space equipment.

Blow study

According to the press service, scientists of the TSU Laboratory for Properties of Substances in Extreme States under the leadership of Professor Vladimir Skrypnyak conduct experiments on key brands of titanium alloys, for example, Ti-Nb. These alloys have high corrosion resistance, therefore, they are suitable for the construction of space and aviation equipment, as well as for shipbuilding.

The report, citing TSU scientists, said that when designing various structures, certain indicators, for example, strength, are laid in the calculation. These numbers are taken from reference books, but the bulk of these characteristics are obtained under conditions of slow loading.

"If there is a sharp blow – the landing gear before landing, the impact of ice on the hull, various vibrations, you cannot use these indicators, you will get a forecast that will lead to an accident, destruction and disaster. (Therefore) we look how much the conditions of high-speed loading affect the characteristics that are laid down in the strength calculations during design", – Skripnyak is quoted.

In particular, physicists focused on damage to materials in which stress concentrators are present – these are various holes, tucks, cuts. Experiments have shown that in this case, with sharp shocks, the ultimate degrees of deformation decrease by more than 10 times. That is, in the presence of various kinds of holes in parts made of titanium alloys, the ability to experience loads sharply decreases.

Weak point

© сайт Томского государственного университета
"In order to prevent accidents that occur during dynamic loads, when designing, strength indicators are taken with a margin, they are increased by 5-6 times. But in fact, you need to increase it by 10. In a place where there is a hub, you can constructively increase the thickness and reduce the stress, and you do not need to increase the entire structure as a whole, where there is no this hub", – Skripnyak explained.

Physicists spoke about the results of their experiments at the international conference "Deformation and destruction of materials and nanomaterials", where more than 500 reports from participants from 16 countries were presented. Representatives of companies involved in the construction, development of new technology for the Arctic and new technologies in the energy sector spoke to materials scientists – Oxford Instruments, INSTRON, Reicherter, LIMMESS and others.

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