Determination of Percentage Elongation after Fracture of Beryllium Materials by Using Beam Displacement

It is specified to use direct measuring method and position transferring method for the measurement of percentage elongation after fracture of metal materials in GB/T 228.1-2010. But the cross-sectional area and the percentage elongation after fracture of tensile specimens of beryllium materials were smaller. When the direct determination method was used, the percentage elongation after fracture did not have the uniqueness, because the percentage elongation after fracture varied with the fracture location and the splicing state of the fracture part of specimens. Although the position transferring method was a remedy for the direct measuring method, its operation was very complicated. Therefore, a method to calculate the percentage elongation after fracture of tensile specimens of beryllium materials by using the beam displacement was introduced, and it could make up for the shortage of the above two methods. Through the analysis of test data and statistics, it was proved that the method could measure the percentage elongation after fracture of tensile specimens of beryllium materials accurately and quickly.