Table 1, — Mechanical properties of roble bianco ( Tabebuia pentaphylla ), 
white oak (Quercus alba), and white ash (Fraxinus americana)- 
Property 
Species- 
: Roble bianco 
: (Tabebuia 
t pentaphylla ) 
White oak 
( Quercus 
alba) 
White ash 
( Fraxinus 
americana) 
Moisture content : 
Green. . percent: 
Air-dry 2 percent: 
• 
• 
Specific gravity : 
Based on green volume and ovendry weight..: 
Based on volume and weight when ovendry..,.: 
Static bending 
Fiber stress at proportional limit 
Green.. p. 
Air-dry2 p. 
Modulus of rupture 
Green p. 
Air-dry2 „ . .p. 
Modulus of elasticity 
Green 1,000 p. 
68.2 
13.5 
0.52 
0,57 
s.i.: 
s.i. : 
s,i. : 
s.i.: 
Air-dry 2 1,000 p. s.i.: 
Work to proportional limit : 
Green .in. -lb. per cu. in.: 
Air-dry 2 in, -lb. per cu, in, • 
Work to maximum load : 
Green .....in, -lb. percu..in.: 
Air-dryl in. -lb. per cu. in.: 
» 
Compression parallel to grain : 
Fiber stress at proportional limit : 
Green p. s.i. : 
Air-dry 2 p. s.i.: 
Maximum crushing strength : 
Green p. s.i.: 
Air-dryl p. s. i. : 
Modulus of elasticity : 
Green 1,000 p. s.i,: 
Air-dryl , 1,000 p. s.i.: 
Hardness^ : 
Green - end lb. : 
Green - side lb,: 
Air-dry2 - end lb . : 
Air-dryl - side lb . : 
6,, 600 
9,480 
10,770 
13,780 
1,450 
1,600 
1.66 
3.18 
11.7 
12.5 
4,040 
5,890 
4,910 
7,340 
1,510 
1,740 
1,030 
910 
1,310 
-960 
68 
12 
0.60 
0.71 
4,700 
8,200 
8,300 
15,200 
1,250 
1,780 
1.08 
2.27 
11.6 
U.8 
3,090 
4,760 
3,560 
7,440 
• ••••••• 
• ••••• 
1,120 
1,060 
1,520 
1,360 
42 
12 
0.55 
0.64 
5,100 
8,900 
9^600 
15,400 
1,460 
1,770 
1.U4 
2.60 
16.6 
17.6 
3,190 
5,790 
3,990 
7,410 
• ••••••••• 
1,010 
960 
1,720 
1,320 
Rept. No. 1980 
(Sheet 1 of 2) 
