摘要
本文研究了侧槽对预制疲劳裂纹Charpy尺寸试样的拘束效应以及其对断裂韧性参量的影响。当侧槽深度大于临界值(d_s)_c时,峰值载荷韧性J_m值与起裂韧性J_i值基本相等。侧槽对试样的加厚作用可用试样的附加厚大表示。对于同样的侧槽深度,不同材料具有不等的附加厚度;试样取得最大附加厚度的侧槽深度为33%。文中提出用拘束系数来定量地估计侧槽对裂纹尖端的塑性拘束作用,能较好地解释本试验结果。
This paper has studied the effect of side-groove constraint on pre-cracked Charpy-size specimen,and the influence of side-groove on fracture toughness parameters. The results indicate that when the-groove depth approach a critical value, the maximum load toughness J_m values are nearly coincidentwith the initiation toughness J_i values. Thickening action of side-groove may be expressed by calculat-ing the extra thickness of specimen. For different materials the additional thickness due to side-grooveis distinct. When the depth of side-grooves is 33% of specimen thickness the specimen obtains themaximum additional thickness. The side-groove constraint coefficient(C) presented by this paper canquantitatively evaluate the level of plastic constraint at crack tip, and explain the experimentul resultswell.
出处
《应用力学学报》
CAS
CSCD
北大核心
1994年第1期54-59,共6页
Chinese Journal of Applied Mechanics
基金
国家核安全局资助项目
关键词
侧槽
断裂韧性
拘束系数
材料力学
side-groove, Charpy-size specimen, fracture toughness, constraint coefficient.