摘要
J积分是表征裂纹尖端的应力和应变场的参量,J积分越小说明裂纹越不容易扩展。以通过表面纳米技术对平面薄板材料的裂纹附近进行局部纳米处理,提升材料的力学性能;以316L不锈钢为基本材料,运用仿真软件AQAQUS进行模拟计算,得出裂纹尖端的J积分大小。结果表明:通过局部表面纳米处理后,薄板裂纹尖端的J积分有了明显减小。再通过不同处理方法对比,得出最佳处理方法是在裂纹尖端椭圆形区域表面纳米处理,其余区域保持原材料,椭圆的长轴与裂纹垂直。
J-integral is the parameters of stress and strain fields near the crack tip. The smaller the J-integral, the less chance to extend the crack is. In this paper, the treatment is taken on the thin plate with crack by the surface self-nanocrystallization, which can improve mechanical property of the material. 316L stainless steel is being used as the basic material. And the simulation software of ABAQUS is being used to make a simulated calculation to get the results of J-integral near the crack tip. The results show that the J-integral near the crack tip of the thin plate with crack is obviously reduced after part of surface being disposed by nanocrystallization. Then, comparing different methods being taken on the structure, the best way is that the ellipse area near the crack tip being disposed by nanocrystallization, the others keep raw material. And the long axis of the ellipse is perpendicular to the crack.
出处
《兵工自动化》
2017年第11期67-69,79,共4页
Ordnance Industry Automation
关键词
J积分
表面纳米技术
平面薄板
断裂
J-integral
technology of surface nanocrystallization
plane plate
fracture
