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Impact tests at both normal and oblique angles of incidence were conducted on thin mildtubes using a moderate size of 90° conical-nosed missiles.The minimum impact speed that generated cracksthrough the thickness of the wall,termed the speed for rupture,was measured,and various modes of rupturewere identified.For a thin tube hit by a missile at a normal angle of obliquity at the speed for rupture,thecontact region spreads across the nose of the missile,and the transverse shear deformation is predominant inthe final failure process.If the angle of obliquity is 30~,the missile pierces a hole through the wall of thetube.At the speed for rupture,the kinetic energy of the missile for oblique angle 30°is only about 45 % thatrequired for plugging at a normal angle of obliquity.
Impact tests at both normal and oblique angles of incidence were conducted on thin mild tubes using a moderate size of 90 ° conical-nosed missiles. That minimum impact speed that generated cracksthrough the thickness of the wall, termed the speed for rupture, was measured, and various modes of rupturewere identified. For a thin tube hit by a missile at a normal angle of obliquity at the speed for rupture, thecontact region spreads across the nose of the missile, and the transverse shear deformation is predominant inthe final failure process. If the the speed of obliquity is 30 ~, the missile pierces a hole through the wall of the tube. At the speed for rupture, the kinetic energy of the missile for oblique angle 30 ° is only about 45% thatrequired for plugging at a normal angle of obliquity.