(Solved): planning to build the following truss using a steel alloy. the stress/strain diagram for this materi ...

planning to build the following truss using a steel alloy. the stress/strain diagram for this material is provided and was obtained using a specimen with an original diameter of 13 mm and a guage length of 50 mm. when the load appied was 50 Kn the diameter was 12.99265 mm. what is the poisson's ratio of this material?