Commit 4a984021 authored by Alfonso Parra Rubio's avatar Alfonso Parra Rubio

new candidate

parent 43b5204f
No preview for this file type
......@@ -78,7 +78,7 @@ An NP Swab has been submitted to an ultimate tensile stiffness until failure. Th
The lay-out of this is the following:
<img src="images/NPTenion.jpeg" alt="plot1" width="900"/>
<img src="images/NPTension.jpeg" alt="plot1" width="900"/>
And results are the following
......@@ -283,3 +283,121 @@ Compared with official NP Swab:
| | **NP Swab** | **OCT Industries** |
|:-----------------:|:-----------:|:------------------:|
| **Angle Reached** | 710º | 837º |
# **Second Candidate**. Resin printed Swabs.
***Raw data in csv format and python script used to read, filter and plot information can be found in the repo folders***
A couple days ago some lab friends reached us to test mechanically some of their proposed designs. On April 25th three different swabs were given. It is going to be used some tracking names to track the model and the test done as the chart shows:
<img src="images/fl/all.jpeg" alt="samples" width="600"/>
| | **Model/pn 1** | **Model/pn 2** | **Model/pn 3** |
|:----------------:|:-----------:|:-----------:|:-----------:|
| **Bending test** | p1b | p2b | p3b |
| **Tension test** | p1t | p2t | p3t |
| **Axial test** | p1a | p2a | p3a |
Also, each experiment will be done on two or three swabs. An additional name will be added indicating the number of the experiment.
### **Bending Test**
<img src="images/fl/bending.jpeg" alt="samples" width="600"/>
Data for the swab with PN 1, PN 2 and PN 3 is the following. It can be seen that the resin used is the most rigid of all the swabs it has been tested here. Also, the diameter of each section is bigger than swab pn2 and swab pn3.
![charts](files/fl/p1b1.png)
![charts](files/fl/p1b2.png)
PN2 has got a similar external shape as PN1 but the resin seems more malleable in terms of bending. Even though the results doesn't show this behavior that clearly as in real life, this could be caused because when we bend with our hands the swab we clearly go over the 35 degrees that this test do. And the difference could be in the ultimate bending angle, not in the strength needed to bend 35 degrees.
![charts](files/fl/p2b1.png)
![charts](files/fl/p2b2.png)
PN3 has got clearly the thinest cross section and is the easier to bend as results shown. Almost one order of magnitude from its partners. The huge peak shown in the swab with pn3 correspond with the compression of the tip so those values should be discarted.
![charts](files/fl/p3b1.png)
![charts](files/fl/p3b2.png)
![charts](files/fl/p3b3.png)
The experiment used as usually the specific Tooling
![charts](images/fl/p2b.jpeg)
Another interesting point is that any of the swabs shown any spring back deformation after the bending test.
### **Tension Test**
The ultimate tension test shows the maturity of the process. Value are so constant for each member of the family. All the swabs shown the capacity to resist almost 3 times more load than the official NP swab. Also, the type of breakage was so fragile and immediate, with a clear defined fragile plane.
PN1 showed a maximun peak so constant in all samples of almos t 140N when deflecting 3-4mm.
![charts](files/fl/p1t1.png)
![charts](files/fl/p1t2.png)
![charts](files/fl/p1t3.png)
The breakage point in all samples were in the transition radius from the tip to the main beam.
PN2 samples , as we commented before, seems a more elastic resin that also holds a bigger plastic deformation part of the chart as it can be seen. The deformation is almost the double, than PN1 and holding 100N. Surprisingly, the breaking point happened in the transition from the big beam section to the reduced beam section in all of the samples.
![charts](images/fl/p2t.jpeg)
![charts](files/fl/p2t1.png)
![charts](files/fl/p2t2.png)
![charts](files/fl/p2t3.png)
The biggest surprise came with the PN3. The comparation with the other swabs make it seems the most brittle with a huge difference. But surprisingly, with almost the half of the mass than its partners, PN3 holds a mean of 88N, 2.3 more times than an official NP swab. Also with a fragile way of breaking, in the middle of the thin section
![charts](images/fl/p3t.jpeg)
Chamfers in all the transition locates the breakage point in a much more secure place. It is needed to avoid an uncontrolled breakage close to the tip inside a nose, so this is the safest design with difference.
![charts](files/fl/p3t1.png)
![charts](files/fl/p3t2.png)
![charts](files/fl/p3t3.png)
### **Axial Torsion Fatigue Test**
![charts](images/fl/p3a3.jpeg)
The last test is the Axial Torsion Fatigue Test. Swabs were loaded up to 10N and turned into the value decreases close to the half.
My personal expectation was that this swab, because of the type of resin were much more brittle. But results shows that absolutely no. PN3 has the record with 7 turns before breaking with is impressive. It is so remarkable that also, the breaking was so so fragile and explosive. Any other swab in this test broke so plastically but this 3 models behaves so fragile as well in this test.
PN1 behaved incredibly flexible, able to make as a mean 3 turns
| **PN** | **Angle Reached** |
|:--------------:|:-----------------:|
| p1a1 | 950º |
| p1a2 | 1100º |
| p1a3 | 1130º |
PN2 started to shown its more flexible behaviour. Up to 4 turns, the vale of the tension did not reduced to the half. The brittle breakage happened as mean in the 7th turn.
| **PN** | **Angle Reached until reduce tenion** | **Angle of breaking** |
|:--------------:|:-----------------:|:-----------------:|
| p2a1 | 1420º | 2600º |
| p2a2 | 1460º |2450º |
| p2a3 | 1590ªº |2580º |
PN3 behaved simillary to PN2, having as a mean 3 turns untill reduce the tension and breaking at the 7th lap as well.
| **PN** | **Angle Reached until reduce tenion** | **Angle of breaking** |
|:--------------:|:-----------------:|:-----------------:|
| p3a1 | 940º | 2300º |
| p3a2 | 1230º |2650º |
| p3a3 | 1020ªº |2370º |
![charts](images/fl/p3a.jpeg)
No preview for this file type
from matplotlib import pyplot as plt
from matplotlib import style
import numpy as np
from scipy import signal
#///////////////////////////////////// openig file, reading and filtering time dependandt dataset. ///////////////////////////////////////
names =['p1b1', 'p1b2', 'p2b1', 'p2b2', 'p3b1', 'p3b2', 'p3b3', 'p1t1', 'p1t2', 'p1t3', 'p2t1', 'p2t2', 'p2t3', 'p3t1', 'p3t2', 'p3t3']
#sample_name = 'p1t1' #introduce here the name of the csv file without the csv extension. It also will use this name to generate the png image data
for name in range(len(names)):
t,e,l = np.loadtxt(names[name] + '.csv', unpack = True, delimiter = ',') #reading rows of the csv. First column is time, second is extension and the last one is force
l = abs(l) # making all positive. So we can define later compresion test or tension test but newtons will be always positive values.
lo = signal.savgol_filter(l,5, 1) #Savitzky-Golay filter. Firts argument is dataset, secon argument is k+1 frame length (allways odd). Those are the polinomial regresion points used to estimate the center data.
# Its odd because the center value must be symmetric
e = abs(e)
#//////////////////////////////////////// plotting stuff //////////////////////////////////////////////////////
style.use('fivethirtyeight') #style used
plt.plot(e,l, color = 'deepskyblue', linewidth = 2, label = 'Raw Data')
plt.plot(e,lo, color = 'fuchsia', linewidth = 2, label = 'Savitzky-Golay filtered data')
plt.legend(loc= 'upper left')
plt.xlabel('y component deflection (mm)')
plt.ylabel('Compressive load (N)')
plt.title('Tracking Number '+ names[name])
plt.savefig( names[name] + '.png', bbox_inches='tight')
plt.show()
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