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New Material Testing - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment explaining the process of testing new materials. It also explores the process for testing and analyzing structures for new space vehicles at room temperature and extreme temperatures.

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Hi, Ted, Dave. 00:00:00
Hi, Kathy Collins said you'd be coming over. 00:00:02
Seems like your friend Van has to test out his cookie recipe. 00:00:04
Yes, Van has a little problem. 00:00:07
He's trying to get a cookie that tastes good, is chewy, and he doesn't crumble. 00:00:09
So I thought maybe if I came over here and saw the process to testing new materials, 00:00:14
maybe there's something I could learn from this to share with Van. 00:00:19
Do you think you could help? 00:00:22
I think so. Ted and I both test and analyze structures for new aerospace and space vehicles. 00:00:23
I usually test them at room temperature, and Ted actually tests them at extreme temperatures. 00:00:28
Since I usually test at room temperature, 00:00:33
the components that I test are larger than those that Ted uses in his thermal structural tests. 00:00:35
What typically happens here is the component of the vehicle structure that we're interested in is built and shipped to our labs. 00:00:40
We then apply sensors to it to help us understand how it behaves under different loads or forces. 00:00:46
This panel here is part of the keel or bottom section of a high-speed civil transport supersonic aircraft. 00:00:51
This vehicle will be capable of flying at speeds up to 2.4 times the speed of sound. 00:00:56
This panel is made from the IM-7 Petty V composite that Kathy and Roberto talked about. 00:01:01
This panel will be tested in tension, 00:01:07
where we can use this machine to apply up to 1.2 million pounds of force onto the panel until it breaks or fails. 00:01:09
While we test panels here at room temperature, 00:01:17
Ted also does thermal structural tests of smaller panels that are usually made of the same composite material. 00:01:19
That's right. NASA has a research program to develop a reusable launch vehicle known as the X-33 and X-34, 00:01:24
which we use to transport people and materials to orbit at a lower cost. 00:01:31
In order to see how effectively adhesives and composites can work in harsh environments in space, 00:01:35
I test relatively small samples of composite materials for liquid hydrogen propellant tanks in cyclic tests here. 00:01:40
In one test, we use liquid nitrogen and liquid helium to cool the specimen. 00:01:46
When the panel is cooled to negative 423 degrees Fahrenheit, then a mechanical load is applied. 00:01:51
An example of how cold liquid nitrogen is, we'll dip this carnation into liquid nitrogen and see how brittle the flowers become. 00:01:57
In one test, we push materials to the max. 00:02:07
We simultaneously subject one surface of the panel to minus 423 degrees Fahrenheit, 00:02:11
while at the same time subject the other side of the panel to 250 degrees Fahrenheit. 00:02:18
Sections of the material is then placed beneath a microscope to look for any cracks or flaws. 00:02:26
If the flaws fall within unacceptable ranges during the time of these tests, 00:02:31
we retest the material or even go back to the drawing board to change the fabrication process or the material. 00:02:36
Gentlemen, thank you so much for your time today and helping to explain to me the process of testing new materials. 00:02:42
But now that brings me back to Van. 00:02:48
What would you suggest Van should do with his cookies? 00:02:50
How should he test his cookies? 00:02:54
Well, I think he should try a bending test performed at room temperature. 00:02:56
That way he can see how well the cookie holds up and whether or not it crumbles. 00:02:59
I'll take it to the extreme. 00:03:02
You know me, Shelly. 00:03:04
To test how well his cookie holds up, he should try a thermal dunking test. 00:03:05
First where he dunks it in cold milk and then in hot chocolate. 00:03:08
Oh, those sound like some good tests. 00:03:11
Thank you very much and I'll report back to Van. 00:03:14
Thanks again. 00:03:16
Uh-huh, and the thermal test, it went well? 00:03:19
Great. 00:03:22
All right, what about the bending test? 00:03:23
Well, I'm ready to test it now. 00:03:25
Oh, wow, these are bending really well. 00:03:29
I think this recipe works. 00:03:32
Van, I think you're forgetting the most important test. 00:03:35
Oh, what's that? 00:03:38
The taste test. 00:03:39
The taste test! 00:03:41
Oh, right, well, I'll call you back with my final results. 00:03:43
But first, I have something planned. 00:03:46
While I get ready for this most important test, 00:03:48
Shelly's going back to the NASConnect studio with some researchers 00:03:51
who are on hand to take your phone calls and email questions 00:03:54
about composite materials and future vehicles like the X-33. 00:03:57
Meanwhile, I'm going to send you to Hugo A. Owens Middle School 00:04:01
where you'll see students from the classroom of science teacher Bernadette Smith 00:04:04
conducting an experiment examining the strength of several materials. 00:04:08
Follow along and after that you'll be challenged to make your own analysis 00:04:12
and predictions based on their results. 00:04:16
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Idioma/s:
en
Materias:
Matemáticas
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
323
Fecha:
28 de mayo de 2007 - 16:53
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 19″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
25.98 MBytes

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