1. PET tensile test revised data
Following the queries regarding the tensile tests of PET samples, the raw data was re visited.
The original data shown took into account the measured cross section of the samples. ( from 36 µm to 80 µm ).
S. Sgobba informs us that calculations on this type of test should be made with the base material thickness.
The weld thickness should not be taken account.
M. Scheubel / N. Dixon CERN 20/05/10

2. Average Tensile strength (MPa)
Tensile test results
Sample
Average Load max (N)
Average Tensile strength (MPa)
Breakage point
Excell-XG532-uncoated-welded
34.87
93.8
weld
Hostaphan-GN nmCu20nmAu-SEFAR welded
35.31
98.5
Hostaphan-GN nmCu20nmAu-JINR welded
35.99
103.5
Excell-XG532-50nmCu20nmAu-welded
40.31
112.2
Melinex-406-uncoated-unwelded
41.08
112.9
in the grips
Excell-XG nmCu20nmAu-welded
45.73
125.7
Hostaphan-GN4600-uncoated-welded
46.25
126.5
Hostaphan-GN4600-uncoated-unwelded
55.84
133.4
Hostaphan-GN nmCu20nmAu-unwelded
51.47
136.3
Hostaphan-RNK2600-uncoated-unwelded
49.65
136.6
Excell-XG532-uncoated-unwelded
143.8
M. Scheubel / N. Dixon CERN 20/05/10

3. M. Scheubel / N. Dixon CERN 20/05/10
Tensile test results
M. Scheubel / N. Dixon CERN 20/05/10

4. M. Scheubel / N. Dixon CERN 20/05/10
Conclusions
All Failures in the grips indicate a tensile strength equal or greater than the displayed result.
The reference samples (un welded) have a higher tensile strength than welded samples.
The Hostaphan uncoated welded sample is close to the reference samples.
Hostaphan coated welded samples have a minimum of 30% lower tensile strength than the reference samples.
The change of coating thickness needs more statistics to clearly understand the effects of a different coating thicknesses.
M. Scheubel / N. Dixon CERN 20/05/10