Hardness measures resistance to localized plastic deformation. Three main types: scratch, indentation, and rebound hardness. Hardness depends on ductility, stiffness, plasticity, and other material properties
N690 is cobalt-enriched stainless steel produced by Bohler. Contains 17.00% chromium for corrosion resistance. Features 0.95% carbon for edge retention and hardness
Journal concentrates on Structural engineering, Finite element method, Stiffness, and Composite materials. Structural engineering research accounts for 73.40% of total publications. Finite element method contributes 23.09%, Stiffness 14.95%
Hard means solid, firm, and difficult to do or accomplish. Describes something requiring great effort or energy. Implies severe, harsh, or unbearable conditions
D2 steel is produced using an electric arc furnace. Steel is melted and cast into billets or ingots. Further processing includes forging, hot rolling, or cold working. Heat treatment is applied for hardness and toughness
Hard is opposite of easy, meaning difficult or rigid. Hard surfaces resist weight or pressure like stone. Hard liquor is strong alcoholic beverage