Is the elongation of aluminum bars related to the diameter?
For the general macroscopic material samples, the tensile test gives strength, elongation of the same diameter should be no obvious, but if the material will do nearly nanometer scale, due to the large decrease, grain boundary defects such as the strength, elongation rate of change of mechanical properties, a certain relationship with the diameter.
In fact, there is a Hall-Patch formula can refer to the relationship between the size of the crystal material strength formula. As for the size of the tensile test sample, it is required to design the length, width, ratio and style according to the national standard.
The elongation rate (delta) is described, elongation and section shrinkage index psi plastic properties. Elongation is the percentage of the total deformation L of the gauge section and the ratio of the original distance to the length L after the tensile fracture of the specimen.
