Question

for what purpose was Iron important by Damascus from India. Answer in one word​

Answer 1

Answer:

Laible (1980) covers the early development of dual-hardness, steel-based armours during the 1960s and 1970s, and Rosenberg and Dekel (2012), in their textbook on terminal ballistics, certainly extends this field to examples of layered and spaced armour systems. However, most of these latter studies have been against short and long rod penetrators. Very little work has actually been carried out and/or published against small-arms ammunition.

The design and performance of Japanese swords is legendary amongst both steelmakers and historians, and multiple layers of finely worked steel laminae have been crafted into very elegant and effective weapons, like the Damascus steel dagger (Lesuer et al., 1996), well before material scientists were able to measure physical and mechanical attributes like fracture toughness. Steels do have a number of natural benefits for manufacturing dual-hardness armours: (1) they have an ability to be hardened to ∼750 VPN, necessary to be an effective strike face material, and (2) they can be metallurgically bonded to themselves and create a near-perfect metallurgical bond with properties very similar to the base materials. In 1983, Kum et al. published some classical results for 12-ply mild steel/carbon steel laminates (Kum et al., 1983). One can see from Fig. 4.12, that synergistic improvements can be achieved in both Charpy V-notch impact (CVI) values and the ductile–brittle transition temperature (DBTT), in such laminates. CVI values in excess of 100 J are unheard of in typical armour steels of today.

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Answer 2

Answer:

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