带环形裂纹的微试样小冲杆试验法测试材料断裂韧性探讨  

Determination of material fracture toughness by circular pre-cracked small punch test specimens

作　　者：关凯书[1] 徐一飞[1] 喻灿[1] 陈吉[1] 

机构地区：[1]华东理工大学承压系统安全科学教育部重点实验室,上海200237

出　　处：《塑性工程学报》2012年第6期103-108,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51075148);质检总局公益性资助项目(201110029);国家科技攻关资助项目(2011BAK06B03)

摘　　要：火电、核电、石油化工行业中有大量的在役压力容器、管道和构件,准确评价在役设备材料的脆化和结构完整性,对于保证装置的安全运行具有重要意义。为适应这一需求,小冲杆测试技术得到了发展,但对小冲杆试样评估在役容器材料的断裂韧性时,仍然只是依靠经验方法和标准的断裂韧性值进行关联,缺乏理论依据。该文提出了在小冲杆试样上开一环形裂纹,以反映裂纹体的断裂韧性测试要求。The mechanical properties of pressure vessels and pipes operated at thermal power, nuclear power and petrochemical industry deteriorate drastically during a long period of service. Consequently, there is an increasing need for the development of a procedure for assessing structure integrity and remain life of these parts. Small punch test （SPT）, a new miniature specimen test technique to adapt to the above requirement, can assess the mechanical characterization of materials from in-service components with non-destructive manner. Now the fracture toughness assessment by SPT is empirical correlation between standard fracture toughness test and SPT without pre-cracked sample. The O-type pre-cracked sample was used in this paper to evaluate fracture toughness. The O-type crack meets with plane strain condition in the crack length direction with axi-symmetric state. The research applied the fracture mechanism to determine the fracture toughness with pre-cracked samples.

关 键 词：小冲杆试验 环形裂纹 断裂韧性 J积分 

分 类 号：TK226.1[动力工程及工程热物理—动力机械及工程]