【判断题】The difference between FAS and FOB is that the seller delivers the goods alongside the ship under FAS, while FOB requires the seller to deliver the goods on board the vessel at port of shipment.
【简答题】某轴受弯曲稳定变应力作用。最大工作应力σ max =500MPa,最小工作应力σ min =200MPa。已知轴的材料为合金调质钢,其对称循环疲劳极限σ -1 =450MPa。脉动循环疲劳极限σ 0 =7000MPa,屈服极限σ S =800MPa。 试求: 1)绘制材料的简化极限应力图(每1mm代表10MPa), 2)按简单加载在图上表示出零件的工作应力点N和材料的强度极限点E, 3)计算材料强...