Info

Table 3. Summary of test data for plate iron tested perpendicular to grain. Yield strength values are represented in Figure 9.

Table 3. Summary of test data for plate iron tested perpendicular to grain. Yield strength values are represented in Figure 9.

Plate iron. Tested perpendicular to grain. No. of tests: 115

Yield Ultimate Elongation strength strength at failure N/mm2 N/mm2 %

Range Mean

Standard deviation

154-298 183-389 0.1-29.2 208 296 8

36 39 7

grain (Table 2) and about 115 tests perpendicular to the grain (Table 3) that plate iron is on average about 15% stronger in the direction of the dominant grain. It is because of this that plate girders were constructed with the grain of the plate along the longitudinal direction of the girder. From the data the characteristic yield strength along the grain is 185 N/mm2 which is lower than the value of 220 N/mm2 given in the Highway Standard BD21.

11 STRENGTH OF ANGLE, TEE, AND BEAM IRON

The tensile strength of angle and tee iron is greater than that of plate iron, which is expected, as it is rolled from piled iron layers of parallel grain. With regard to the more complex rolled I-section too few data exist to make any generalisation on this form. Tests conducted at M.I.T. on samples cut from an I-beam gave a mean yield strength of 165 N/mm2 while tests conducted at UMIST on samples cut form a Belgian I-Beam gave a mean yield strength of 319 N/mm2 (Kontos 1996).

12 COMPRESSIVE STRENGTH OF WROUGHT IRON

Tests by Marshall in 1887 and Kirkaldy in 1866 show that for practical purposes the tensile and compressive strengths of wrought-iron can be taken as the same. However, Gordon has proposed that in cases where

Figure 8. Yield and Ultimate strength of plate iron tested along grain direction. Vertical pairs of data points are from the same tensile test. (O'Sullivan 2007).
Figure 9. Yield strength of plate iron tested along and across grain direction. (O'Sullivan 2007).

Table 4. Summary of tensile test data on angle and tee iron. (O'Sullivan 2007).

Angle and tee iron. Tested parallel to grain. No. of tests: 94

Yield Ultimate Elongation strength strength at failure

Range Mean

Standard deviation

Was this article helpful?

0 0
Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

Get My Free Ebook


Post a comment