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问题:

已知单向拉伸应力状态的正应力σ,则σ 1 =______,σ 2 =______,σ 3 =____

答案:

σ 1 =σ,σ 2 =σ 3 =0;τ max =σ/2; σ 1 =σ 2 =σ,σ 3 =0;τ max =σ/2; σ 1 =σ 2 =σ 3 =σ;τ max =0