硫化锌热冲击试验与裂纹间距预报
发布时间：2019-01-01 11:30
【摘要】：重点研究了硫化锌热冲击开裂机理和热冲击裂纹间距、深度的预报。10mm厚硫化锌试块的燃气急热试验表明:裂纹间距随热冲击能量的增大而减小,热冲击过程中加热面最先出现非贯穿裂纹,停止加热后,裂纹贯穿试件。结合传热和热强度仿真分析,获得了热冲击过程中试件的瞬态温度场和应力场。基于材料性能的损伤演化理论,以裂纹间距和深度为变量,利用最小能量原理,获得了热冲击裂纹间距的理论预报方法,预测结果与试验吻合较好,进而分析了断裂韧性、热胀系数、材料初始模量对裂纹间距、裂纹深度的影响。该文的研究对深入理解硫化锌的热冲击失效机制,对其改性和研制具有重要意义。
[Abstract]:The mechanism of thermal shock cracking of zinc sulfide and the prediction of crack spacing and depth of thermal shock are emphatically studied. The gas rapid heat test of 10mm thick zinc sulfide specimen shows that the crack spacing decreases with the increase of thermal shock energy. During the thermal shock process, the non-penetrating crack appears first on the heating surface, and after stopping heating, the crack penetrates the specimen. The transient temperature field and stress field of the specimen during thermal shock are obtained by combining the simulation analysis of heat transfer and thermal intensity. Based on the damage evolution theory of material properties and taking crack spacing and depth as variables, a theoretical prediction method for crack spacing in thermal shock is obtained by using the principle of minimum energy. The predicted results are in good agreement with the experimental results, and the fracture toughness is analyzed. The influence of thermal expansion coefficient and initial modulus of material on crack spacing and crack depth. The research in this paper is of great significance for understanding the thermal shock failure mechanism of zinc sulfide and for its modification and development.
【作者单位】： 北京空天技术研究所;清华大学工程力学系;
【基金】：国家重大专项工程资助项目
【分类号】：O346.1
[Abstract]:The mechanism of thermal shock cracking of zinc sulfide and the prediction of crack spacing and depth of thermal shock are emphatically studied. The gas rapid heat test of 10mm thick zinc sulfide specimen shows that the crack spacing decreases with the increase of thermal shock energy. During the thermal shock process, the non-penetrating crack appears first on the heating surface, and after stopping heating, the crack penetrates the specimen. The transient temperature field and stress field of the specimen during thermal shock are obtained by combining the simulation analysis of heat transfer and thermal intensity. Based on the damage evolution theory of material properties and taking crack spacing and depth as variables, a theoretical prediction method for crack spacing in thermal shock is obtained by using the principle of minimum energy. The predicted results are in good agreement with the experimental results, and the fracture toughness is analyzed. The influence of thermal expansion coefficient and initial modulus of material on crack spacing and crack depth. The research in this paper is of great significance for understanding the thermal shock failure mechanism of zinc sulfide and for its modification and development.
【作者单位】： 北京空天技术研究所;清华大学工程力学系;
【基金】：国家重大专项工程资助项目
【分类号】：O346.1
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