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41-2 设所求板厚为t(mm) (1)因接头效率是100%故10.3×t×500×1=103000 t=103000/10.3×500=20 (2)因接头效率是70%故10.3×t×500×0.7=103000 t=103000/10.3×500×0.7=28.57≈28.6因此,(1)20mm(2)28.6mm(或29mm)。 41-4(1)(○) 一有余高,就会在焊缝边缘处产生应力集中,从而将使疲劳强度降低。 (2)(○) 因为高强钢由缺口而导致的疲劳强度的下降率高,所以,当承受重复载荷时,即使
41-2 Suppose the thickness of the plate is t (mm) (1) Because the joint efficiency is 100%, 10.3 × t × 500 × 1 = 103000 t = 103000 / 10.3 × 500 = 20 (2) Because the joint efficiency is 70% Therefore, 10.3 × t × 500 × 0.7 = 103000 t = 103000 / 10.3 × 500 × 0.7 = 28.57≈28.6 Therefore, (1) 20 mm (2) 28.6 mm (or 29 mm). 41-4 (1) (o) If there is excess height, stress concentration will occur at the edge of the weld, which will reduce the fatigue strength. (2) (○) Since the reduction rate of the fatigue strength of the high-strength steel due to the notch is high, when subjected to repeated load, even if