The effects of manual and automatic measurements on the measurement results are discussed through analyzing the measurement of percentage elongation after fracture of cold-rolled steel plate produced by Baotou Steel. The results showed that there were some differences between the percentage elongations after fracture with manual and automatic measurements as well as the original gauge length and fracture position were determining factors. When the measurement requirements for percentage elongation after fracture of metallic material are more accurate, manual measurement should be adopted to ensure measurement results to be closer to the mechanical characteristics of material itself.

tensile test  /  percentage elongation after fracture  /  manual measurement  /  automatic measurement