LAMPIRAN A PERHITUNGAN DATA PENGUJIAN
1. Menghitung densitas sampel komposit SR-P
Keterangan: ρ
= kerapatan densitas gr.cm
-3
m = massa gr
V = volume cm
3
-
Tanpa Serat
m = 7,04 gr
V = 6,0291 cm
3
cm A2= m = 7,04 gr
V = 5,9055 cm
3
cm
-
Berat serat 0,1 gr
B1= m = 8,11 gr V = 1,9234 cm
3
cm B2= m = 8,10 gr
V = 6,6339 cm
3
cm
-
Berat serat 0,2 gr
C1= m = 9,83 gr V = 8,385 cm
3
Universitas Sumatera Utara
cm C2= m = 9,68 gr
V = 7,7952 cm
3
cm
-
Berat serat 0,3 gr
D1= m = 8,30 gr V = 5,1648 cm
3
cm D2= m = 8,44 gr
V = 6,8352 cm
3
cm
2. Menghitung daya serap air porositas sampel komposit SR-P
Keterangan: DSA = daya serap air
m
b
= massa basah gr m
k
= massa kering gr
-
Komposit Tanpa Serat
A1= m
b
= 4,98 gr m
k
= 4,95 gr
A2= m
b
= 5,02 gr m
k
= 4,98 gr
Universitas Sumatera Utara
-
Berat serat o,1 gr
B1= m
b
= 3,34 gr m
k
= 2,92 gr
-
Panjang Serat 1 cm
m
b
= 5,86 gr m
k
= 5,81 gr
-
Panjang Serat 1,5 cm
m
b
= 5,78 gr m
k
= 5,68 gr
-
Panjang Serat 2 cm
m
b
= gr
m
k
= gr
-
Panjang Serat 2,5 cm
m
b
= 5,26 gr m
k
= 5,21 gr
-
Panjang Serat 3 cm
m
b
= 5,31 gr
Universitas Sumatera Utara
m
k
= 5,26 gr
3. Menghitung kekuatan tarik sampel
Keterangan: σ
= Kuat Tarik MPa F
= Gaya N A
= Luas Permukaan m
2
-
Komposit tanpa Serat
F = load x a = 24,827 10
-9
kgf x 9,8 ms
-2
= 243,304 10
-9
N A = W x T = 7 mm x 2,34 mm = 16,38 mm
2
-
Komposisi SR 0,2 gr panjang Serat 0,5 cm
F = load x a = 36,646 10
-9
kgf x 9,8 ms
-2
= 359,138 10
-9
N A = W x T = 7 mm x 2,16 mm = 15,16 mm
2
-
Variasi Panjang Serat 1 cm
F = load x a = 55,659 10
-9
kgf x 9,8 ms
-2
= 545,458 10
-9
N A = W x T = 7 mm x 2,64 mm = 18,48 mm
2
-
Variasi Panjang Serat 1,5 cm
F = load x a = 52,226 10
-9
kgf x 9,8 ms
-2
= 10
-9
N A = W x T = 7 mm x 2,23 mm = 15,61 mm
2
Universitas Sumatera Utara
-
Variasi panjang Serat 2 cm
F = load x a = 56,074 10
-9
kgf x 9,8 ms
-2
= 10
-9
N A = W x T = 7 mm x 2,34 mm = 14,04 mm
2
-
Variasi panjang serat 2,5 cm
F = load x a = 93,313 10
-9
kgf x 9,8 ms
-2
= 914,467 10
-9
N A = W x T = 7 mm x 2,88 mm = 17,28 mm
2
-
-
Variasi panjang serat 3 cm
F = load x a = 95,080 10
-9
kgf x 9,8 ms
-2
= 10
-9
N A = W x T = 7 mm x 2,89 mm = 20,23 mm
2
4. Menghitung kekuatan impak sampel komposit SR-P