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### Messages - Aaron Widera

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16
##### Modelling of composites / Re: Curved Circular Fibers
« on: June 10, 2021, 08:59:04 AM »
Thank you for translating your post to englisch.
I will just copy my answer from above again so that we have the answer below the question ;)
Quote
To answer your question. If your Domain length is 500 µm it should be enough to use 550 µm long fibers and define the fiber centers for the generation.
You can find that option in the Fiber Options where you can also set the Diameter, Length and Orientation.
Here you click on the "Edit" beside the "Center" and choose the option "Unfiformly in Box".
Assume your fibers are oriented in X-direction, you fill the options as:
X-min = 545 µm ; X-max = 555 µm
Y-min = 0 µm     ; Y-max = "domain length in Y-direction"
Z-min = 0 µm     ; Z-max = "domain length in Z-direction"

Can you have  brief look if this helps you out?

17
##### Modelling of composites / Re: Curved Circular Fibers
« on: June 04, 2021, 05:24:10 PM »
Hi Tim,

welcome to the Forum :)
First, could you please repost your question down below in english? Our official Forum language is enligsh and this would help all of our clients to benefit froum your question.

Second to answer your question. If your Domain length is 500 µm it should be enough to use 550 µm long fibers and define the fiber centers for the generation.
You can find that option in the Fiber Options where you can also set the Diameter, Length and Orientation.
Here you click on the "Edit" beside the "Center" and choose the option "Unfiformly in Box".
Assume your fibers are oriented in X-direction, you fill the options as:
X-min = 545 µm ; X-max = 555 µm
Y-min = 0 µm     ; Y-max = "domain length in Y-direction"
Z-min = 0 µm     ; Z-max = "domain length in Z-direction"

Using that option you will need way shorter fibers because you set their center to be placed in the middle of the structure.
Please give us a short feedback if that helped.

18
##### FiberGeo / Re: Periodic X in FiberGeo
« on: June 01, 2021, 11:05:39 AM »
Hello Tabea,
Periodic X will make GeoDict to generate the strucutre periodically in X direction. The same holds for the other directions Y and Z.
So you can make a full periodic strucutre in each direction, but also choose specific directions for periodicity, e.g. periodic in X and Z direction but non-periodic in Y direction.

19
##### FiberFind / Re: Get separate Material IDs from a .g32 file
« on: May 27, 2021, 05:13:28 PM »
Hello Barbara,
first of all welcome to the forum and have a good time here!

You can use our ImportGeo-Base module for that. You can load the .g32 file with it and then you have it in different material IDs. This structure can then save as .gdt file.

20
##### Lithium Ion Batteries / Re: Why does the cell capacity not change when I use different c-rates for charging?
« on: May 20, 2021, 02:05:58 PM »
Hallo, first of all welcome here to the forum. Nice to have questions here :)

Let me try to summarize answers here:
1. As in real experiments, the capacity reached by the charging simulation depends on the criterium that stops the time evolution of the battery.
2. For a constant C-rate the most important stopping criteria are:
a) Reaching a user-defined final Cell SOC (implemented in BatteryDict2018 as “Battery’s State-ofCharge Range” or “Range of the Cell State of Charge”)
b) Reaching a user-defined final cell potential (this will be implemented in BatteryDict 2022)
3. The stopping criterion (b) will result in different reached capacities depending on the user-defined C rate.
4. For any constant C Rate, the stopping criteria (a) will result in the same reached capacity, if the cell potential does not diverge during the simulation.
5. One can reproduce the result of the stopping criterion (b) with the stopping critertion (a) using a certain trick.

The trick I mentioned is:
1. Definition of settings in ChargeBattery for stopping criterium with final cell SOC:
a) $$SOC_{start}$$: User-defined initial cell SOC.
b) $$SOC_{endt}$$: User-defined final cell SOC.
c) $$C\text{-}rate$$: user-defined charge rate.
2. Known from analyzing the battery structure and using the material settings:
a) $$C_{theo}$$: theoretical capacity of the full battery including unconnected active material, see result map in GDR: “Battery:TotalCapacity”
3. By the definition of the cell state of charge, we already know:
a) $$C_{reached} = | SOC_{end} - SOC_{start} | * C_{theo}$$
4. Additionally, we can determine the time for charging the battery cell:
a) $$reached\text{ }time = | SOC_{end} - SOC_{start} | * \frac{3600 s}{C\text{-}rate}$$
b) (Example 1: the C-rate=1 charges 100% of $$C_{theo}$$ within one hour (3600 s).
(Example 2: The C-rate=3 charges 50% of  $$C_{theo}$$  within a sixth of an hour (600 s).
5. We know this without having done any simulation with BatteryDict.
6. This comes directly from the chosen stopping criterion and does not depend on the rest of the algorithm.

21
##### Forum FAQs / Frequently asked questions:
« on: September 14, 2020, 04:25:08 PM »
Hello everyone welcome to our Forum-FAQs

Why can I not make a post to the forum?

22
##### Forum Rules / Forum Rules and Guidelines
« on: September 03, 2020, 04:29:37 PM »
Basic Rules

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