Test results of straw rejection
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Test results of straw rejection for 3 criteria - Dubna 806 straws: Load max F vs elongation dL data shape - test results of straw rejection for 3 criteria - conclusion Presented by S.Movchan. 11-Sep-14. S.Movchan Straw manufacturing and QC. 1. Dubna 806 straws

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  • Test results of straw rejectionfor 3criteria

    • - Dubna 806 straws: Load max F vs elongation dLdata shape

    • - test results of straw rejectionfor 3criteria

    • - conclusion

  • Presented by S.Movchan

11-Sep-14

S.Movchan Straw manufacturing and QC

1


Dubna 806 straws

data taken from file “Straw_data_05_05.xls”

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S.Movchan Straw manufacturing and QC

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Load max F vs elongation dL: 3-D presentation

Dubna 806 straws

N

Cut:

F=3.7 kG

F (kG)

dL(mm)

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3

dL=1 mm


Load max F vs elongation dL: 3-D presentation

F (kG)

N

Good

3.7 kG

Bad

F (kG)

dL(mm)

dL(mm)

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Zoom of BAD region

N

7 straws

8 straws

N

F (kG)

dL(mm)

F=(3.7-8) kG

dL=(0-1) mm

F (kG)

dL(mm)

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Load max F vs elongation dL

Blue – start straw

Red – end straw

data shape

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6 samples from Sefar September

Dubna data shape is not like expected:

Due to this we have some probability to install “BAD”straw (elongation less than 1 mm) in the Module-0 after straw rejection

(non elastic mylar deformation is started after dL=0.5 mm at 100 MPa)

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Dubna 806 straws

  • Test results of straw rejection for 3 criteria:

    • Load max F< 3.7 kG (Strength=100 MPa)

    • dL < 1 mm

    • dL < 1 mm @ Load max F< 3.7 kG

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Load max F<3.7 kG (Dubna 806 straws)

Blue – start straw

Red – end straw

F=3.7 kG

F min = 2.5 kG /10mm

F max = 7.75 kG/10mm (K ~ 3, K=max/min)

Rejected straws: N = 28 straws

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Load max F<3.7 kG(Dubna 806 straws)

BUT

Blue – start straw

Red – end straw

F=3.7 kG

Rejected straws:

N= 28 straws

CERN straw rejection criteria: Load max L ≤ 3.7 kG (Strength ≤ 100 Mpa)

Rejected straws: N = 28 straws (~ 3.5 %)

and we have 7 straws (~ 1%)with elongation less than 1 mm

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7 straws (~ 1% ) are with elongation less than 1 mm


dL < 1 mm (Dubna 806 straws)

Rejected straws:

N= 15 straws

Blue – start straw

Red – end straw

Dubna straw rejection criteria: elongation dL < 1 mm

Rejected straws: N = 15 straws ( ~ 2 %)

and all good straws have elongation more than dL ≥ 1 mm !!!!!

dL=1 mm

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S.Movchan Straw manufacturing and QC

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dL < 1 mm @ Load max < 3.7 kG (Dubna 806 straws)

Blue – start straw

Red – end straw

dL=1 mm

F=3.7 kG

Rejected straws:

N= 56 straws

Dubna straw rejection criteria: elongation dL < 1 mm @ L < 3.7 kG

Total rejected straws: N = 35 straws (~ 4 %)

and all good straws have elongation more than dL ≥ 1 mm @ L > 3.7 kG

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Conclusion

Both CERN and Dubna proposed criteria for straw rejection were tested on

Dubna straws. Was shown that:

- rejection criteria Load max F < 3.7 kG (Strength=100 Mpa)is wrong

due to ~ 1 % of straws (7 straws out from 800) have elongation less

than dL=1 mm

- rejection criteria dL < 1 mm is correct. Number of

rejected straws are N = 18 straws ( ~ 2 %)

- combine criteria dL < 1 mm @ Load max F < 3.7 kG was tested too.

Number of rejected straws are N = 35 straws ( ~ 4 %)

2 criteria and are tested and acceptable

-------

Sefar straws:

Straw sample elongation was not fixed during tensile test. So, straw

rejection criteria can not be correctly tested. Elongation must be measure too.

wrogn

“soft”

“hard”

“soft”

“hard”

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