Page 17 - eBC21410_機械力學(下)_課本PDF
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Chapter 9 張力與壓力 5
範例 1
νྡ 9-3 הͪd͜ɓ፻॰Ξৎ 31.4 kN ٙዚኜd፻॰ٜٙࢰމ 40 mmd༊ӋՉה͛ٙ
ੵᏐɢf
鋼索
P
圖 9-3
3
答： P = 31.4 kN = 31.4Ò10 Ndd = 40 mm
͟ʮό 9-1̙j
P P 4P 4 # 31.4 # 10 3
t v = = = = = 25(MPa)
A r d 2 r d 2 3.14 # 40 2
4
範例 2
ྡ 9-4 הͪdɓ٤ːഇঐוա 25120 N ʘൿΣ༱ࠠdഇ̮ٙࢰމ 50 mmdʫࢰ
މ 30 mmd༊ӋՉה͛ٙᏀᏐɢf
30 mm 50 mm
P
圖 9-4
答： P = 25120 Ndd = 50 mmdd = 30 mm
i
o
͟ʮό 9-1̙j
P P 4P 4 # 25120
c v = = = = = 20(MPa)
A r 2 2 r] d o - g 3.14 #] 50 - 30 g
2
2
2
2
d i
d i
4 ] do - g
