Fretting fatigue phenomenon in bolted high-strength steel plate connections

2015 ◽  
Vol 8 (3) ◽  
pp. 174-178 ◽  
Author(s):  
Olli-Pekka Hämäläinen ◽  
Timo Björk
Keyword(s):  
High Strength Steel ◽  
Steel Plate ◽  
High Strength ◽  
Fretting Fatigue ◽  
Plate Connections

scholarly journals Experimental and Numerical Investigation on the Perforation Resistance of Double-Layered Metal Shield under High-Velocity Impact of Armor-Piercing Projectiles

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 626
Author(s):  
Riccardo Scazzosi ◽  
Marco Giglio ◽  
Andrea Manes
Keyword(s):  
High Strength Steel ◽  
Steel Plate ◽  
Experimental Studies ◽  
Practical Interest ◽  
High Strength ◽  
Experimental Tests ◽  
Element Model ◽  
Transportation Systems ◽  
Metal Shield ◽  
Softening Parameter

In the case of protection of transportation systems, the optimization of the shield is of practical interest to reduce the weight of such components and thus increase the payload or reduce the fuel consumption. As far as metal shields are concerned, some investigations based on numerical simulations showed that a multi-layered configuration made of layers of different metals could be a promising solution to reduce the weight of the shield. However, only a few experimental studies on this subject are available. The aim of this study is therefore to discuss whether or not a monolithic shield can be substituted by a double-layered configuration manufactured from two different metals and if such a configuration can guarantee the same perforation resistance at a lower weight. In order to answer this question, the performance of a ballistic shield constituted of a layer of high-strength steel and a layer of an aluminum alloy impacted by an armor piercing projectile was investigated in experimental tests. Furthermore, an axisymmetric finite element model was developed. The effect of the strain rate hardening parameter C and the thermal softening parameter m of the Johnson–Cook constitutive model was investigated. The numerical model was used to understand the perforation process and the energy dissipation mechanism inside the target. It was found that if the high-strength steel plate is used as a front layer, the specific ballistic energy increases by 54% with respect to the monolithic high-strength steel plate. On the other hand, the specific ballistic energy decreases if the aluminum plate is used as the front layer.

scholarly journals Effect of focal position on laser-MAG arc hybrid weld bead of thick high-strength steel plate

2020 ◽  
Vol 38 (2) ◽  
pp. 131s-134s
Author(s):  
Kazuya ISHIDA ◽  
Shinichi TASHIRO ◽  
Masami MIZUTANI ◽  
Manabu TANAKA
Keyword(s):  
High Strength Steel ◽  
Steel Plate ◽  
High Strength ◽  
Weld Bead ◽  
Focal Position
Sign in / Sign up

Export Citation Format

Share Document