Elastic and Inelastic Torsion Results for A36 Steel

Direct Shear Data

diameter	0.625 in
0.2% yield load	22,406 lb
maximum load	32,601 lb

 

Torsion Data

T_max = 3560 in-lb
τ_ult = T_max c / J = 74.3 ksi

 

Summary of Results

Test Comparison

		Yield Stress (ksi)	Ultimate Stress (ksi)	Percent Difference
Tension Test 1	σ	48.7	67.7	33%
Direct Shear Test	τavg	36.5	53.1	37%
Torsion Test	τ	24.3	74.3	101%

Torsion Results

	Experimental Results	Reference Values	% Error
Modulus of Rigidity, G	11.71 x 106 psi	11.5 x 106 psi 4	1.8%
Shearing Yield Point, τyp	24.30 ksi	24.5 ksi 2	0.8%
Poisson's Ratio, ν	0.261 3	0.26 4	0.4%

1. Based on a tensile test on A36 steel performed by Jeff Thomas on April 12, 2005.  Use the results from your group's tension test performed earlier this semester.
2. Based on tensile yield point results from a tensile test on A36 steel performed by Jeff Thomas on October 10, 1996.  The shearing yield point is approximately half the tensile yield point, based on the maximum shear stress theory of failure.  Use the results from your group's tension test performed earlier this semester.
3. Based on modulus of elasticity results from a tensile test on A36 steel performed by Jeff Thomas on July 3, 1997 and this torsion test.  Use the results from your group's tension test performed earlier this semester.  Poisson's ratio can be calculated from E and G using the following formula. 
4. From MatWeb.com.