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【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,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)计算材料强度极限的平均应力σ rm 和应力幅σ ra , 4)指出零件可能发生的主要失效形式,并计算零件的安全系数。
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