Study on mechanical property of the shell and the unpacking initial velocity of display shells

Using Elastic properties of solid materials tester to test the elastic properties of the shell of display shells, obtain that Young's modulus is 2.16GPa, Shear modulus is 0.87GPa and Poisson's ratio is 0.241GPa. Using Instron 5985 Material testing machine to test the tensile mechanical characteristics of the shell, obtain that the tensile yield strength is 14.72MPa and breaking strength of the shell is 11.20MPa. For the first time taking pressure expansion leading to shell burst as foundation, the model of display shells is established. The numerical simulation results show that when the unpacking gunpowder is black gunpowder, the unpacking initial velocity is 104.6m/s-114.8m/s. Comparing with the experiment result 112m/s, maximum error is only 7.4m/s, meeting the requirement of precision. When the unpacking gunpowder is black gunpowder the unpacking initial velocity is 303.7m/s-331.2m/s. The unpacking initial velocity can be changed by changing the ratio of charge.