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笔者在教学中发现我校公路专业现用《材料力学》教材中(建筑工业出版社1978年12月新一版)第三强度理论强度条件的表达方式及其举例均值得商榷。为此,在有关教师的帮助下,作了一些探讨。现将笔者的粗浅认识就教于同行,以便在教学中引起注意。一、法上的差异及其影响该书256页第三强度理沦的强度条件表达式为: σ_(r3)=σ_1-σ_2≤[σ] (1)
The author found in our teaching materials in the current “material mechanics” textbook (Construction Industry Press, December 1978 a new version) the third intensity theory of the conditions of expression and examples are debatable. To this end, with the help of the teachers, made some discussion. Now the author’s superficial knowledge to teach in the peer in order to attract attention in teaching. First, the difference between the law and its impact on the 256th page of the intensity of the third strength theorem of the intensity of the conditional expression: σ_ (r3) = σ_1-σ_2 ≤ [σ] (1)