无论是高分子材料,还是高聚物制件,在一般情况下,人们首先所关心的问题是“牢不牢”?所谓“牢”或者“不牢”,只不过是一种习惯上的定性的区分,无法作仔细的、可靠的比较。为此,人们引入机械强度的概念,来对材料的牢固程度作定量的、客观的分析和比较,以便在材料选用时做到心中有数。在使用过程中,高聚物材料或制品被破坏的方式有多种情形。它们可能被 Regardless of whether it is a polymer material or a polymer product, under normal circumstances, people’s first concerns are “unbreakable,” and “containment” or “failure” is merely a matter of customary characterization. The distinction cannot be made with a careful and reliable comparison. For this reason, people introduced the concept of mechanical strength to quantitatively and objectively analyze and compare the firmness of materials so that they can be sure when selecting materials. There are many situations in which the polymer material or product is destroyed during use. They may be