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发表于 2023-5-15 08:49
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我是在navweaps上看到的 原文: When first introduced into service during World War II, the barrel life was rated at 290 ESR. About the time of the Korean War, some estimates raised life to as much as 350 ESR. HC rounds at 2,690 fps (820 mps) were 0.43 ESR and at 1,900 fps (579 mps) were 0.03 ESR. The Target rounds at 1,800 fps (549 mps) were 0.08 ESR. In the 1967 and 1980s deployments, the use of "Swedish Additive" (titanium dioxide and wax) greatly reduced barrel wear. It has been estimated that four AP shells fired using this additive approximated the wear of a single AP shell fired without the additive (0.26 ESR) and that HC rounds fired with the additive caused even less wear (0.11 ESR). The "Swedish Additive" was issued in a packet that was inserted between two of the propellant bags. Later developments during the 1980s deployment led to putting a polyurethane jacket over the powder bags, which reduced the wear still further. This jacket was simply a sheet of foam with a fabric border around the ends that was tied to the powder bag. When the jacket burned during firing, a protective layer formed over the surface of the liner, greatly reducing gaseous erosion. This wear reduction program was so successful that liner life could no longer be rated in terms of ESR, as it was no longer the limiting factor. Instead, the liner life began to be rated in terms of Fatigue Equivalent Rounds (FER), which is the mechanical fatigue life expressed in terms of the number of mechanical cycles. The 16"/50 (40.6 cm) Mark 7 was ultimately rated at having a liner life of 1,500 FER. |
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发表于 2023-5-6 10:29
