Environmentally Neutral Engineering Composites for Boats and Aircrafts

TRADITIONAL ENGINEERING MATERIALS

Steel, Aluminum, Brass, Bronzes, Plastics, Polymer Composites and Wood are the most used traditional engineering materials. These have certain properties as follows: (CLICK on the TABLE to ENLARGE have a better View)

Certain Traditional Engineering Materials properties

Certain Derived Properties of Composites in Fibers, Compared with Steel

Fiber (40% uni-directional) Tensile Strength Sp.wt Sp. Tensile Strength Tensile Modulus Eq Wt Section Eq. Wt Rigidity Modulus Cost Factor
(MPa) (kg/m3) (m) (GPa) (cm) Carbon Steel = 1 cm (Kg-m2) (Rs/ Kg)
Bamboo 293 600 48833 18.32 13.08 3416 250
Bamboo-Glass 350 703 49786 18.23 11.16 2111 255
Hybrid Bamboo1 440 688 63953 22.85 11.4 2282 740
Hybrid Bamboo2 438.2 695 63050 27.09 11.29 3248 990
E-Glass 816.8 1474 55413 18.91 5.32 237.27 270
S-Glass 1104 1455 75876 23.16 5.39 302.22 510
Carbon Fiber 1222 1336 91467 74.95 5.87 1263 3210
Kevlar 49 1298 1243 104424 45.27 6.31 947.8 2210
Boron 946.5 1467 64519 92.94 5.35 1186 3810
High tensile Steel 4000 7900 50632 210 0.99 16.98 250
Low Carbon steel 400 7850 5095 210 1 17.5 60

Comparative Design Advantage of Hybrid Bamboo Composites:

In order that we are able to arrive at “optimum” engineered material system for a particular design need, we shall compare the “Rigidity factor” based on Low Carbon Steel (which is the standard structural engineering material)

The average thickness of Steel sheet material needed for the hull of a small 20 ft Dinghy that needs to be “seaworthy’ is 6 mm. The various thickness factors for the Composites (based on equivalent Rigidity factor) are presented below:

Fiber (40% uni-directional) Tensile Strength Sp.wt Sp. Tensile Strength Engineered Section Wt per Sq m Rigidity Modulus Fabrication Cost Factor
(MPa) (kg/m3) (m) (cm) Kg (Kg-m2) (Rs/ Sq m)
Low Carbon steel 400 7850 5095 0.6 47 3.78 5640
Bamboo (40%) 293 600 48833 1.36 8.16 3.84 3060
Bamboo-Glass 350 703 49786 1.36 9.56 3.82 3657
Hybrid Bamboo1 440 688 63953 1.26 8.67 3.8 7700
Hybrid Bamboo2 438.2 695 63050 1.2 8.34 3.9 9908
Kevlar 49 1298 1243 104424 1.01 13.11 3.88 33319

 It is noted that we could engineer superior structures using both 40% bamboo composite and bamboo-glass composites. The cost factors would be lesser than that of Low carbon steel structure, even at 50% excess thickness levels in the Bamboo composite structures. That would mean far superior Strength-Rigidity factors in the resultant engineered systems. See the Table below:

Fiber (40% uni-directional) Tensile Strength Sp.wt Sp. Tensile Strength Engineered Section Wt per Sq m Rigidity Modulus Fabrication Cost Factor
(MPa) (kg/m3) (m) (cm) Kg (Kg-m2) (Rs/ Sq m)
Low Carbon steel 400 7850 5095 0.6 47 3.78 5640
Bamboo (40%) 293 600 48833 2.04 12.24 12.96 4590
Bamboo-Glass 350 703 49786 2.04 14.34 12.89 5485

It is further noted that even at double the “minimum thickness” for “steel equivalent” Rigidity factor, the weight factor is only about one-fourth of steel … allowing us to have greater Strength-Rigidity-Economics

For more details on the subject of STRENGTH, RIGIDITY and related Factors, please visit the blog:

http://cr4.globalspec.com/comment/752322/Re-Optimized-Engineering-Materials-Through-Cleantech

Bamboo-Composite Molded Boat/ Dinghy (Click to Enlarge)

Please see the following blogs on this subject for more details:

1. http://cr4.globalspec.com/comment/750225/Re-Optimized-Engineering-Materials-Through-Cleantech

2. http://cr4.globalspec.com/comment/754912/Re-Optimized-Engineering-Materials-Through-Cleantech

We are now looking at the possibility of Designing and constructing a Lightweight AIRCRAFT (Two-Seater) using Hybrid Bamboo Composites. Please see here:

http://cr4.globalspec.com/comment/756431/Re-Optimized-Engineering-Materials-Through-Cleantech

Main Structure Syatems in a Lightweight Aircraft

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One response to “Environmentally Neutral Engineering Composites for Boats and Aircrafts

  1. Pingback: ENERGY, MATERIALS AND ENVIRONMENT PEOPLE | ZERO-WASTE ZERO-CARBON BUSINESS-MODEL

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