本文介绍了一种用紧凑型试样测量平面应变裂纹终止韧性K_(Ia)的试验方法。该方法比起过去使用的方法有许多优点。启裂不采用疲劳裂纹,而采用带机加工缺口的脆性焊缝,这就降低了试验费用。一个由尖劈和轴衬组成的刚性好的加载系统,同采用销钉加载的双悬臂梁试样相比,便于得到高得多的启裂与终止韧性比值。采用适度尺寸的试样,用大的启裂值,可测得较高的K_(Ia)值。 This paper presents a test method for measuring the ultimate toughness K Ia of a plane strain crack using a compact specimen. This method has many advantages over the methods used in the past. Cracking does not use fatigue cracks, and brittle welds with machined notches reduce the cost of testing. A rigid loading system consisting of wedges and bushings provides a much higher crack-to-to-end toughness ratio than pin-loaded double-cantilever specimens. Using moderately dimensioned specimens, large K i values ​​can be measured with large values ​​of cracking.