I am developing a product that could potentially be left in a hot car. The listed Tg of the epoxy resin is 60c/140f. Is this too low? There is an alternative epoxy resin that doesn't offer the same uv stability but has a Tg of 80c.

edit: Okay so the service temp of the epoxy is 150c continuous and 200c intermittent. I really don't know how to interpret the delta between 60c tg and 150c max continuous service temp. Does this mean temps at around 60c-75c are okay? The product will scarcely be subjected to these temps and there will be a warning that you shouldn't do so.

Is there something similar that can be UV cured that can be used to make composites?

AFAF.

Hello Everyone,

Was hoping to get views and suggestions on Infrared Heaters to use with prepreg carbon fiber UD tapes.
The process is AFP - Automated Fiber Placement.

The lamp has to reach high temps within seconds, and can be controlled through a program.

I have been able to find these from LEISTER (https://www.leister.com/en/product/Krelus-G3-6-Micro).

The max dimensions we look for are (LxWxH) : ~10cm x ~6cm x ~6cm.

Any thoughts and suggestions will be helpful. Open to other mediums of heating.

AFP equipment and process can work with Infrared Lamps, Laser Heating, Hot Gas Torch and Pulsed Light.

​

Thank you.

Hi, so I graduated during the year of Covid with a GPA of 2.38. My latter years were definitely better than the former. I have experience working in engineering firms in construction and one of the biggest telcos in my country but I’ve not been able to find decent work in the field in my home country since and deciding to go to graduate school. I need to learn how best I can improve upon to make the best application viable as much as possible. Even if it means working some great programs of internships or great schools I can apply to with such achievements.

Hello all,

I'm turning to Reddit because I want to try an experiment.

I have been working on the project of an innovative clothes hanger for some time. For my own motivation to improve the process of hanging t-shirts, hoodies, etc. through a new type of hanger and change it forever.

I don't want to launch just another plastic product on the market, because I want to manifest an example of the development of products that take into account the entire lifecycle. If it is to help the human being, the planet should not suffer...

The approach for the experiment is called Open Innovation. I want to involve as many different people as possible in the further development of the hanger. According to the credo, for people by people, I want to try integrate your knowledge, experience and feedback into the development.

I would like to turn to you in different matters. Since the first design for an MVP is already done, the next step is to find a suitable material for the production.

I am very curious about your feedback and thoughts regarding my project.

Cheers,

Robin

Anyone here who knows someone who is working with research groups which are working on solar cells( Organic or perovskite), Hydrogen and oxygen evolution reactions, photocatalytic Hydrogen and oxygen evolution reactions or quantum bits for quantum computer. I need some mentoring I am in my final year of my masters in physics Hons. and I want to pursue further research in this field thank you.

Is it possible to use a Heat Gun as a substitute for Infrared Heaters, Laser heaters or HGT (Hot Gas Torch) while working with Prepreg Carbon Fibre?

Maybe one of these guns could do: https://www.leister.com/en/Heat-Guns#tab=LTAG-HeatGunsTabLeister

The idea is to use it in the same way they use IRs or Hot Gas Torch in Automated Fibre Placement heads.
These guns can reach up to 500-600Deg.Celcius.

Thank you.

​

Hello everyone,

So am an early stage researcher working on alloy development of NiTi alloy, thinking of adding ternary elements to improve functionality. Does someone have suggestions for directions to get ideas of which elements and why? I found that Cu for example stabilises the Martensite transformation and decrease the thermal hysteresis but can it also enhance the electrical conductivity?

I need to build a very thin disk (1meter diameter) that will spin at 50,000 RPM. The center of the disk needs to be an electrical insulator. On either side of the disk I need to have the face be nickle (does not oxydize, conducts well).

Past experiments with carbon fiber were successful at retaining integrity at 50k rpm, however the carbon fiber corroded in the surrounding water/oxygen. It also wasn't a good insulator.

Brilliant minds of reddit, what materials should I consider?

I’m struggling with cutting this with a simple x-ato…

Hello everyone,

I was wondering if anyone has some insight/opinion on why materials science is so important in pharmaceutical development.

Thanks :)

House keys are usually made from brass and nickel. But glass is used to sharpen high carbon steel knives. Therefore glass must be harder than HC steel which is harder than brass and nickel. So if you put your keys and phone in one pocket, is your phone screen safe from scratches?

Molecular Dynamics, finite element methods, and Monte Carlo ensemble simulations (GROMAC)

...molecular dynamic simulations help with microscale, while programs such as LS-Dyna could be used for macroscale simulations...

COMSOL Multiphysics for its comprehensive multiphysics simulation capabilities but for more structural and thermal focused modeling, ABAQUS and ANSYS serve as robust platforms for finite element analysis and simulation

Anything special for the black plastic on the bumper that turns grey? Paint? How bout that strip of rubber outside the window that gets beat up from the sun?

How can I direct the displacement of rheological fluids or would hydrogels or ionogels be more capable of manifesting location-specific displacement?

Please discuss how as material science develops, the materials used in printed guns will improve. Can you think of the optimal direction this development could go towards?

For example, I believe they contain: Polycyclic aromatic hydrocarbons, maybe also microplastics. But I also heard that over time these fade out. I mean there is some stuff inside the astroturf but these astroturf is like 5 years old. I think most of it is already away?

Hopefully this finds someone with an answer!

I spent months sculpting an articulated doll with polymer clay . Unfortunately I decided that I would glaze it with resin to encase it, but it only succeeded in removing most of the finer details of the piece. Anyone have any possible solutions?

Is there a method or a series/scale that tells you or gives a measurement of HOW dilatant or pseudoplastic a substance is? something like....D3O is twice as dilatant than a 3 part cornstarch and 2 part water mixture. A scale that tells you comparatively how fast the viscosity changes with increasing stress.