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侧槽的拘束作用及对断裂韧性参量的影响 被引量:1

Constraint of Side-groove and Its Influenceon Fracture Toughness Parameterin Charpy-size Specimens
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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.
机构地区 西安交通大学
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.
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