1．铸铁的强度和韧性的基本特征本文论述有关强韧性球铁的问题。铸铁中的石墨是以各种形式存在的,在压应力下,石墨对应力的传递是不成问题的;在拉应力下,材料存在着微细切口,即使是切口效应小的球铁,1个球状空窝在无限大的物体中存在的应力集中系数也是2．04,如按2维考虑达到3．0,则显示出相当的应力集中。 1. Basic Characteristics of Strength and Toughness of Cast Iron This article addresses the issue of ductile ductile iron. Graphite in cast iron exists in various forms. Under compressive stress, the transfer of graphite to stress is not a problem. Under tensile stress, there is a slight incision in the material. Even for a ductile iron with a small incision effect, a spherical The stress concentration factor of an empty nest in an infinite object is also 2.04, and if two dimensions are taken into consideration, a stress concentration of 3.0 appears.