材料科学与工程学报2017，Vol.35Issue(4)：528-533,6.DOI:10.14136/j.cnki.issn 1673-2812.2017.04.003
硫化锌热冲击试验与裂纹间距预报
Experiment and Prediction of Crack Spacing of ZnS under Thermal Shock
摘要
Abstract
Crack spacing and depth prediction of ZnS materials were studied under thermal shock.The gas rapid heating experiment showed that crack spacing of ZnS specimens with 10mm thickness decreased with increasing heat flux.During the thermal shock,heating surface of specimen firstly appeared non-penetrated cracks.After the heating stopped,cracks penetrated specimen.The transient temperature field and stress field were calculated by finite element analysis,and the cracking mechanism of ZnS under thermal shock was studied.A simplified shear lag analysis using a progressive scheme was proposed for ZnS,and a theoretical method for predicting thermal shock crack spacing was developed by using the minimum energy principle with the crack spacing and depth as variables.The influences of fracture toughness,thermal expansion coefficient and elastic modulus on crack spacing and depth were analyzed.Result shows that reduced modulus and thermal expansion coefficient,increased fracture toughness contribute to improving the performance under thermal shock.The present research provides deeper understanding of the failure mechanism of ZnS under thermal shock,improving the performance and designing new ZnS.关键词
硫化锌/热冲击/最小能量原理/裂纹间距/裂纹深度Key words
ZnS/thermal shock/crack spacing/crack depth/minimum energy principle分类
数理科学引用本文复制引用
陶永强,李晶,宋月娥,冯雪..硫化锌热冲击试验与裂纹间距预报[J].材料科学与工程学报,2017,35(4):528-533,6.基金项目
国家重大专项工程资助项目 （）
