High velocity impact test of a C-Mn steel and inertia effect

✍ Scribed by Yongning Liu; Huijiu Zhou

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 370 KB
• Volume: 48
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(94)90087-6

✦ Synopsis

The fracture toughness of a C-Mn steel and relevant inertia effect in a high velocity impact test were investigated. The inertia force causes oscillations in the force-time curves in impact testing which can be evened up by smoothing the peaks and valleys on the curves. When the impact velocity is in excess of 5 m/s, an unusual stress pulse is displayed which is positive on the back side of the specimen in the first period of vibration. The inertia force contributes to the fracture process, especially in the brittle state of materials. So, the peak force on the force-time curves can be used to calculate the fracture toughness in this state without any corrections. The steel tested exhibits a ductile-to-brittle fracture transition as impact velocity increases.