5.1 Kesimpulan
Berdasarkan hasil dan pembahasan pada penelitian ini dapat ditarik kesimpulan 1. Unjuk kerja crash box kendaraan yang ada di pasaran dapat diperoleh dengan
simulasi crash. Hasil simulasi crash pada crash box MAZDA CX5 (a) total energi yang dapat diserap, 𝑈 5,91 kJ dengan perpindahan impaktor 120 mm, (b) specific energy absorption, SEA sebesar 54,37 kJ/kg, (c) crush force efficiency, CFE sebesar 0,56.
2. Perancangan crash box innovative BFRC dilakukan dengan menggunakan CAD-CATIA V5R20. Hasil rancangan crash box innovative BFRC yang dapat menggantikan crash box Mazda CX5 dengan geometri (a) diameter dalam 110 mm, (b) Ujungnya diberi trigger chamfers 45o, (c) ketebalan dindingnya 20 mm.
3. Pembuatan crash box BFRC dilakukan dengan 2 cara yaitu dengan vakum infus dan manual. Perbandingan resin dan hardener yang dipergunakan 2:1 dan 1:1.
4. Unjuk kerja crash box BFRC diketahui berdasarkan hasil simulasi crash pada crash box BFRC. Simulasi crash yang paling optimal pada crash box BFRC ini adalah yang dibuat dengan vakum infus dengan geometri berdiameter dalam 110 mm, ketebalan 20 mm dan salah satu ujungnya di chamfer 45o . Hasilnya (a) mampu menyerap energi, 𝑈 sebesar 7,95 kJ dengan besar perpindahan sebesar 120 mm, (b) specific energy absorption, SEA sebesar 28,93 kJ/kg, serta (c) crush force efficiency, CFE sebesar 0,54.
5. Perbandingan pengujian kuasi - statik tekan pada crash box BFRC yang dibuat dengan cara
a. Manual
Hasil perhitungan indikator unjuk kerjanya (a) energi yang mampu diserap, 𝑈 6,02 KJ dengan perpindahan crosshead sebesar 50 mm, (b)
specific energy absorption, SEA sebesar 21,91 KJ/kg, (c) crush force efficiency, CFE sebesar 0,69. Tipe kerusakannya berupa catastrophic failure di tengah-tengah sehingga kurang sesuai bila digunakan sebagai komponen crash box.
b. Vakum infus
Hasil perhitungan indicator unjuk kerjanya (a) energy yang mampu diserap, 𝑈 sebesar 5,01 KJ dengan besar perpindahan sebesar 50 mm, (b) specific energy absorption, SEA sebesar 18,23 KJ/kg, (c) crush force efficiency, CFE sebesar 0,55. Tipe kerusakan yang terjadi progressive failure dengan mode splaying dan fragmentation.
Kesimpulannya prototipe Crash box BFRC yang dapat menggantikan Crash box Mazda CX5 adalah yang dibuat dengan vakum infus dengan diameter dalam 110 mm, ketebalan 20 mm dan salah satu ujungnya di chamfer 45o.
5.2 Saran
1. Perlu dilakukan simulasi dengan model 3D solid
2. Perlu dilakukan penelitian lanjutan dengan pengujian weight drop test sesuai standar New Car Assessment Program (NCAP)
3. Perlu dilakukan penelitian lanjutan menggunakan matriks yang ramah lingkungan, seperti Poly Lactic Acid (PLA), atau bio - matriks lainnya
4. Perlu dilakukan penelitian lanjutan menggunakan serat alam selain bambu 5. Perlu dilakukan perancangan ulang dengan bentuk yang mudah di pasang di
kendaraan
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133 Lampiran 1
Uji komposisi material crash box MAZDA CX5
135 Lampiran 2
Hasil pengujian bambu strip
141 Lampiran 3
Hasil pengujian matriks
150 Lampiran 4
Hasil perhitungan unjuk kerja crash box
4.1 Simulasi ulang crash pada profil persegi empat
Displacement, mm Force, N Energy Absorbed
0 0 0 0
Total Energy Absorbed 20.16131153 KJ
Peak Load 174339 N = 174.339 KN
Force average 93774.73333 N = 93.77473333 KN
SEA 73.3138601
CFE 1.859125521
4.2 Simulasi crash pada crash box MAZDA CX5
4.3 Pengujian crush pada crash box MAZDA CX5
Crash Box MAZDA CX 5 Quasi-Static
Displacement (mm) Load
Displacement (mm) Load
Displacement (mm) Load
4.4 Pengujian crush pada crash box BFRC chamfers 45o, vakum infus
4.5 Pengujian crush pada crash box BFRC chamfers 45o, manual
Displacement mm Force Displacement Energy Absorbed
0.00 0.00
4.6 Simulasi crush pada crash box BFRC chamfers 45o, vakum infus
Displacement Force N Perubahan posisi Energy Absorbed
0.00 0.00
2.50 12179.10 0.50 0.005483860227
3.00 14594.00 0.50 0.006691802480
Displacement Force N Perubahan posisi Energy Absorbed
19.98 63966.50 0.49 0.030872356900
20.48 67683.60 0.50 0.032609729770
Displacement Force N Perubahan posisi Energy Absorbed
41.68 65915.10 0.50 0.032946350250
42.18 67568.70 0.50 0.033531130560