理化检验物理分册1981年第6期登载了《某些脆性材料的抗压强度与抗拉强度之间的一个近似关系式——兼对第二强度理论的修正》一文(以下简称《关系》),该文认为目前人们对第二强度理论的提法和解释不够确切,因而要进行修正。将其断裂条件σ_1-v(σ_2+σ_3)=σ_b (1)应用于单向压缩状态,就得到抗拉强度σ_b,抗压强度σ_c和泊松比v的关系式: σ_b/σ_c=v (2)《关系》认为式(2)近似地表示了某些脆性材料这三个数值的关系。对此,我们想谈几点看法,与《关系》的作者和同行们共同探讨。 1 对于第二强度理论,的确存在着不同的提法和解释。至于《关系》所讲的修正,则不自今日始。这里仅举两个例子而不是作历史的考证。《关系》引用的费 Physical and Chemical Testing Physics Volume 1981 No. 6 published “some brittle materials compressive strength and tensile strength of an approximate relation between - and the amendment to the second strength theory” article (hereinafter referred to as the “relationship”) , This article thinks that people do not give exact definition and explanation of the second strength theory at present, so we should amend it. Applying the fracture condition σ_1-v (σ_2 + σ_3) = σ_b (1) to unidirectional compression, the relationship between tensile strength σ_b, compressive strength σ_c and Poisson’s ratio v is obtained: σ_b / σ_c = v ) “Relationship” that equation (2) shows approximately the relationship between the three values ​​of some brittle materials. In this regard, we would like to make a few observations and discuss with the authors and colleagues of the “relationship.” 1 There are indeed different formulations and explanations of the second strength theory. The amendment to “relationship” does not start from today. Here are just two examples rather than for historical research. “Relationship” quoted fees