为了提高喷嘴的抗冲蚀磨损能力,将梯度功能材料理论运用于喷嘴材料的设计中,改传统的均质喷嘴材料为非均质喷嘴材料,提出在梯度陶瓷喷嘴制备中将残余压应力引入喷嘴入口的设计目标.在组成分布指数一定的条件下,针对主要设计参数对梯度陶瓷喷嘴残余应力的影响进行有限元分析,探讨了梯度层厚度、临界梯度层材料组分差对SiC/(W,Ti)C单梯度陶瓷喷嘴残余热应力的影响规律,在组成分布指数取0.5时,优化SiC/(W,Ti)C梯度陶瓷喷嘴梯度层厚和临界梯度层材料组分差.结果表明,残余应力随梯度层厚h及临界梯度层SiC体积组分差的不同产生很大差异,合理设计梯度层厚h及临界梯度层SiC体积组分差可在喷嘴入口形成有效残余压应力,最佳梯度层厚为5mm,临界梯度层SiC组分差小于5%(体积分数).
参考文献
| [1] | DENG Jianxin;FENG Yihua;DING Zeliang et al.Wear behavior of ceramic nozzles in sand blasting treatments[J].Journal of the European Ceramic Society,2003,23(02):323-329. |
| [2] | 邓建新,张希华.B4C/SiCw陶瓷喷砂嘴的制备及其冲蚀磨损机理研究[J].硅酸盐通报,2004(03):18-20. |
| [3] | 刘莉莉 .梯度陶瓷喷嘴的设计理论及其应用研究[D].山东大学,2006. |
| [4] | 赵军 .新型梯度功能陶瓷刀具材料的设计制造及其切削性能研究[D].山东工业大学,1998. |
| [5] | 刘莉莉,邓建新,皇攀凌,朱利娜.SiC/（W,Ti）C梯度陶瓷喷嘴的设计与制备[J].中国科学E辑,2007(07):857-865. |
| [6] | 王保林;韩杰才;张幸红.非均匀材料力学[M].北京:科学出版社,2003 |
| [7] | ESHELBY J D .The determination of the elastic field of an ellisoidal inclusion,and related problems[J].Proceedings of the Royal Society of London,1957,A241:376. |
| [8] | MORI T;TANAKA K .Average stress in matrix and average elastic energy of mateials with misfitting inclasions[J].Acta Metallurgica,1973,21:571. |
| [9] | KERNER E H .The elastic and thermal-elastic properties of composite media[J].Proceedings of the Physical Society,1956,1169:808-813. |
| [10] | D.Jianxin .Effect of thermal residual stress on the high temperature toughening behaviour of TiB_2/SiC_w composites[J].Journal of Materials Processing Technology,2000(3):292-298. |
| [11] | JIN Z H;NODA N .Transient thermal stress intensity factors for a crack in a semi-infinite plane of a functionally gradient material[J].International Journal of Solids and Structures,1994,31(02):203-218. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%