A fracture mechanics approach to the residual strength behavior of ballistically damaged high hardness laminar composite steel
✍ Scribed by Malcolm D. Campbell; Richard Chait
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 961 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Ah&met-Welded and unwelded specimens of an air-melted laminar composite steel armor were tested for degradation of strength from ballistic impact. Specimens were impacted with cal. 0.30 AP and ball projectiles at various velocities and O-degree obliquity. During impact, specimens were tensile loaded from 0 psi to the preload that would result in specimen failure at impact. Specimens that did not fail upon impact were pulled to failure to determine residual strength.
Damage due to cal. 0.30 impact maximized at approx. 2.25 in. laterally for ball and 1 in. for AP at a velocity near the ballistic limit. Preload increased the damage slightly. Impacts near the weld produced no detectable degradation of the weld.
Damage near the maximum resulted in residual strengths near 20% of the original u_. Fracture mechanics analysis showed that residual strengths could reasonably be predicted by assuming that all damage could be modeled as a center notch through the hard face.