V形缺口法硬质合金断裂韧性研究
A STUDY OF FRACTURE TOUGHNESS OF HARDMETALS BY CHEVRON-NOTCHING METHOD
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摘要: V形缺口三点弯曲试样主要用于极脆性材料(如硬质合金、陶瓷等)平面应交断裂韧性(KIC)的测试。这种试样与传统的断裂韧性(KIC)试样相比,其优点是:(1)尺寸简单,易于加工;(2)不需用疲劳法预制裂纹;(3)不需测定裂纹长度(KIC值可直接从载荷峰值计算而得);(4)其断裂韧性值分散性低,重复性好,可比性强。另外,本文还讨论了断裂韧性(KIC)与硬质合金主要结构参数的关系。结果表明:硬质合金的KIC值与其结构参数λ/DWC1/2存在着良好的线性关系。Abstract: Three-point bending specimen with V shape notch is mainly used for tasting the plane-strain fracture toughness (KIC) of very brittle materials such as hardmetal, ceramic, etc. This specimen has following obvious advantages over conventional toughness specimen. (1)Simple geometry can easily be machined. (2)No fatigue precracking is required. (3)No crack length measurements are required (KIC can be directly calculated from knowledge of peak load). (4)Its KIC was found to be of low dispersity, superior reproducibility and distinctive comparison.Besides, the relation between the KIC and the main structural parameters λ/DWC1/2 of hardmetal is also discussed. The result shows that fhere is an excellent linear relation between them.
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