摘要
研究了预应变对Zr702/TA2/Q345R复合板低周疲劳行为的影响。研究表明,预应变对Zr702/TA2/Q345R复合板微观组织的影响与各层材料的晶体结构有关。在Zr702纯锆和TA2纯钛层中,随着预应变水平提高,滑移带和孪晶明显增多。预应变促进了Zr702/TA2/Q345R复合板的循环软化变形,使应变范围、循环塑性变形程度提高而疲劳寿命降低。预应变后,材料的反向屈服极限降低,棘轮损伤程度因此降低。尽管预应变提高了复合板组成材料的抗裂纹扩展阻力,但复合板在预应变后应变幅提高,加剧了塑性损伤累积,因此疲劳寿命降低。
The effect of pre-strain on low cycle fatigue behavior of Zr702/TA2/Q345 R composite plate was studied in this paper. The results show that the effect of pre-strain on the microstructure of Zr702/TA2/Q345 R composite plate is related to the crystal structure of component material. In Zr702 pure zirconium and TA2 pure titanium layers, the slip bands and twins structure increase obviously with pre-strain level. The pre-strain promotes the cyclic softening deformation of Zr702/TA2/Q345 R composite plate, increases the strain range and cyclic plastic deformation, and decreases the fatigue life. After pre-strain deformation, the reverse yield strength of the material decreases and the ratchetting damage degree decreases. Although the pre-strain improves the crack propagation resistance of component materials, the strain amplitude of the overall composite plate increases after pre-strain deformation, which intensifies the accumulation of plastic damage, so the fatigue life decreases.
作者
周彬彬
于鹏
常乐
周昌玉
业成
张伯君
Zhou Binbin;Yu Peng;Chang Le;Zhou Changyu;Ye Cheng;Zhang Bojun(Nanjing Vocational University of Industry Technology,Nanjing 210023,China;Nanjing Tech University,Nanjing 211816,China;Nanjing Boiler and Pressure Vessel Inspection Institute,Nanjing 210028,China)
出处
《钛工业进展》
CAS
2021年第5期19-26,共8页
Titanium Industry Progress
基金
国家自然科学基金资助项目(51975271,51675260,51475223)
南京工业职业技术大学科研启动基金资助项目(YK20-14-05)。
关键词
预应变
复合板
低周疲劳
断裂
pre-strain
composite plate
low cycle fatigue
fracture
