User talk:Lau-Gc/sandbox

Thiot Ingenierie
Create by Patrick THIOT, DGA gun design expert, Thiot Ingenierie it's a private company, world leader in manufacturing launchers for laboratory tests and expert in shocks physics. Thiot Ingenierie do impact, perforating and testing for certification for plane, or just verify that the piece tested resists at the shock. Gas gun impacts testing and hypervelocity impacts testing are realised in laboratory with its own machinery. This company make too dynamic material characterization and fast dynamics calculation.

History
Founded in 1988 by Patrick THIOT. In 1992 this company make the first hight velocity two stage launcher (4km/s), the most powerful light gas gun in France for the center of Gramat, France.

In 2000, Thiot Ingenierie do this first export contract for Lawrence Livermore National Laboratory, United States of America.

In 2008 Thiot Ingenierie acquire new premises and new facilities, 2500m² dedicated to shock physics, including 3 launchers (7 calibers), 2 detonation chambers and 1 shock press. This new facilities had permit to create a laboratory with this machinery, where it is possible to make impacts, perforing and detonating testing, material characterization, damaging in dynamic conditions and also numericals simulations.

Gas gun
The light gas gun is an apparatus for physics experiments, a highly specialized gun designed to generate very high velocities. It is usually used to study high speed impact phenomena (hypervelocity research), such as the formation of impact craters by meteorites or the erosion of materials by micrometeoroids. Some basic materials research relies on projectile impact to create high pressure: such systems are capable of forcing liquid hydrogen into a metallic state. Text of the page

Single-stage Light Gas Gun
Thiot Ingenierire's launchers can launched pieces (hails, stones, tires...) up to 1000m.s^-1 and a diameter of 350mm.

Two-stage Light Gas Gun
This company has Light Gas Gun specialised for the space which can launch a piece of 22mm of diameter at 7000m.s^-1 and one other for the space which can launch a piece of 35mm of diameter at 3000m.s^-1.

Hopkinson bars
Although there are various setups and techniques currently in use for the Split-Hopkinson pressure bar, the underlying principles for the test and measurement are the same. The specimen is placed between the ends of two straight bars, called the incident bar and the transmitted bar. At the end of the incident bar (some distance away from the specimen, typically at the far end), a stress wave is created which propagates through the bar toward the specimen. This wave is referred to as the incident wave, and upon reaching the specimen, splits into two smaller waves. One of which, the transmitted wave, travels through the specimen and into the transmitted bar, causing plastic deformation in the specimen. The other wave, called the reflected wave, is reflected away from the specimen and travels back down the incident bar. Text of the page

There are compression testing, tension testing and torsion testing.

For compression testing, there are two symmetrical bars, the sample in between the both. The incident bar is struck by a striker bar during testing. The striker bar is fired from a gas gun. The transmitted bar collides with a momentum trap.

Tension testing is more complexe because of the loading methods and specimen attachment to the incident and transmission bar.

For torsion testing there are two methods: the stored-torque method where the incident wave is created by suddenly releasing the clamp, which sends a torsion wave toward the specimen. And another loading technique known as explosive-loading uses explosive charges on the free end of the incident bar to create the incident wave.

Dynamic press
The role of de dynamic press is to create a strong pressure or tension on a piece to test its resistance. All this tests are realised with facilities of measurements to do analysis which permit to see at what time and what pressure the pieces studied break or crack. Thiot Ingenierie's dynamic press can punch 200 tones in the few time of 3 millisecondes.