Fracture Properties of 350 WT Steel at Very High Loading Rates
Defence Research Establishment Atlantic Dartmouth, Nova Scotia Canada
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Fracture studies were conducted on 12.7 mm thick compact tension specimens of 350 WT steel at very high loading rates. The equipment used in the studies consisted of a specially designed Split Hopkinson Bar system capable of delivering sufficient energy to fracture the specimens on impact. Projectile speeds in the Split Hopkinson Bar were in excess of 50ms. .Following fracture, the extent of the shear lip as well as the stretch zone width which occurs before crack extension, were measured in all the specimens tested. Test temperatures ranged from -45 to 15C. It was found that above OC, fracture is ductile with a shear lip extending across the fracture surface for the specimens with no fatigue precrack. For those with a fatigue precrack, the shear lips are smaller.
- Metallurgy and Metallography