Question 48 (Textile Engineering & Fibre Science)
A cotton yarn with 5% breaking elongation needs to be tested for breaking strength in a tensile tester at 500 mm gauge length. The clamp speed (mm/min) required to break the specimen in 20s is __74.90 : 75.10__.
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Given in the question-
Breaking elongation(e)=5%
Gauge length(l)=500 mm
Breaking time(t)=20 seconds
=20/60 min
t=0.33 min
The clamp speed(v,mm/min)=?
Calculation:
Extension length(L)=Gauge length x Breaking elongation%/100
Extension length(L)=500 x 5/100
L=25 mm
By formula:
Clamp speed(v)=Extension length(L)/breaking time(t)
Clamp speed(v)=25/0.33333
Clamp speed(v)=75.0 (Answer)