【摘要】：重點(diǎn)研究了硫化鋅熱沖擊開(kāi)裂機(jī)理和熱沖擊裂紋間距、深度的預(yù)報(bào)。10mm厚硫化鋅試塊的燃?xì)饧睙嵩囼?yàn)表明:裂紋間距隨熱沖擊能量的增大而減小,熱沖擊過(guò)程中加熱面最先出現(xiàn)非貫穿裂紋,停止加熱后,裂紋貫穿試件。結(jié)合傳熱和熱強(qiáng)度仿真分析,獲得了熱沖擊過(guò)程中試件的瞬態(tài)溫度場(chǎng)和應(yīng)力場(chǎng)�；诓牧闲阅艿膿p傷演化理論,以裂紋間距和深度為變量,利用最小能量原理,獲得了熱沖擊裂紋間距的理論預(yù)報(bào)方法,預(yù)測(cè)結(jié)果與試驗(yàn)吻合較好,進(jìn)而分析了斷裂韌性、熱脹系數(shù)、材料初始模量對(duì)裂紋間距、裂紋深度的影響。該文的研究對(duì)深入理解硫化鋅的熱沖擊失效機(jī)制,對(duì)其改性和研制具有重要意義。
[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.
【作者單位】： 北京空天技術(shù)研究所;清華大學(xué)工程力學(xué)系;
【基金】：國(guó)家重大專項(xiàng)工程資助項(xiàng)目
【分類號(hào)】：O346.1

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