就大多数材料而言, 其屈服强度和硬度大致相当.而个别材料,不管怎样,还是呈现出显著差异,铸铁就是其中较有代表性的材料之一.这种材料内部存在着微小的细裂纹,在拉伸力的挤压力的双重作用下,其断裂风险主要集中在高应力部位.从几何学的角度来看,这些细小裂纹却不构成危险.因此,铸铁能够承受相当大的负载.所以,这种材料的屈服强度和硬度在选材时必须分开予以考虑.
英语翻译In most materials,the strength is the same in tension an
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