ããç´å¾14mmé¢çï¼ä¸ç±³ééæ¯1.21ãã
ããæ¯ç±³é¢ççç论ééï¼å¯éè¿ä¸å计ç®å
¬å¼ï¼éç¨äºä»»ä½ä¸åç´å¾é¢çã
ããä¸ ééçäºç´å¾ä¹ç´å¾ä¹0.00617å³0.00617 d²ï¼XXXã/m
ããäº 1ãWï¼Ïr²ÃLÃɡ÷1/1000
ãã2ãWï¼ÏÃd²/4ÃLÃÉ¡Ã1/1000ï¼Ïd²/4ÃLÃÉ¡Ã1/1000ã
ããå¼ä¸ï¼Wââééï¼ï¼åä½ï¼å
¬æ¤ï¼
ããdââé¢çç´å¾ï¼ï¼åä½ï¼æ¯«ç±³ï¼
ããÏââ
åå¨çï¼3.1416ï¼
ããrââé¢çåå¾ï¼ï¼åä½ï¼æ¯«ç±³ï¼
ããLââé¿åº¦ï¼ï¼åä½ãç±³ï¼
ããÉ¡ââ æ¯é7.85ï¼å
/åç±³³ï¼ã
ãããä¾ãé¢çç´å¾14mmï¼æ±å
¶æ¯ç±³ç论ééï¼
ãã解ï¼â Wï¼0.00617 d²ï¼0.00617Ã14Ã14ï¼1.20932ï¼1.21ï¼ã/mï¼ã
ããâ¡Wï¼Ïr²ÃLÃɡ÷1/1000ï¼3.1416Ã7²Ã1Ã7.85Ã0.001ï¼ï¼1.208416ï¼1.21ï¼ã/mï¼ã
ããâ¢Wï¼ÏÃD²/4ÃLÃÉ¡Ã1/1000ï¼3.1416÷4Ã14²Ã1Ã7.85Ã0.001
ããï¼0.7854Ã196Ã1Ã0.00785ï¼ï¼1.208416ï¼1.21ï¼ã/mï¼ã