| 红外整流罩纯热应力分析 |
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| 引用本文： | 江宏,林宇.红外整流罩纯热应力分析[J].红外技术,2021,43(3):292-298. |
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| 作者姓名： | 江宏 林宇 |
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| 作者单位： | 昆明物理研究所,云南 昆明 650223 |
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| 摘 要： | 高速红外制导战术导弹飞行时，气动热（qw）剧烈，qw作用于导弹红外整流罩上，产生的热应力σ热是导致整流罩热炸裂的主要因素。针对此问题，在导弹整流罩早期研制阶段，对于整流罩选材和能否进行下一步约束状态研究模拟整流罩固结导弹金属壳体实际工作状态，提出一种简单快捷的判别方法，红外整流罩纯热应力σ纯热分析。将自由状态整流罩受到温度梯度▽T引起的σ纯热从叠加位移约束WΓ引起更大的σ热中剥离出来，抛开WΓ的影响，单独分析较小的σ纯热，进一步抓住引起整流罩热炸裂的主导因素。结合双色透波需求，以硫化锌ZnS红外整流罩为例，进行σ纯热仿真分析，ZnS材料强度极限σmax大于σ纯热，判定整流罩可以进入约束状态研究。经约束WΓ的σ热试验验证，整流罩未炸裂，佐证此方法为整流罩选材提供一种快捷判断。
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| 关 键 词： | 纯热应力 快速力学判据 自由状态 红外整流罩 |
| 收稿时间： | 2020-12-07 |
Infrared Dome Pure Thermal Stress Analysis |
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| JIANG Hong,LIN Yu.Infrared Dome Pure Thermal Stress Analysis[J].Infrared Technology,2021,43(3):292-298. |
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| Authors: | JIANG Hong LIN Yu |
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| Affiliation: | Kunming Institute of Physics, Kunming 650223, China |
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| Abstract: | When supersonic infrared guided tactical missiles fly,the infrared dome of the missile is affected by the intense aerodynamic heat.The thermal stress generated by heat is the main factor causes thermal cracking of the dome.In response to this problem,in the early development stage of the missile dome,a simple and quick method to select the dome material and whether the next restraint state can be studied is to simulate the actual working state of the solidified missile metal shell of the dome,infrared dome pure thermal stress analysis.The pure heat caused by the temperature gradient■T of the free state dome is separated from the larger heat caused by the superimposed displacement constraint,the smaller pure heat is analyzed separately.The leading factor causing the thermal explosion of the dome is analyzed.Combining the dual-color infrared transmission requirements,taking the zinc sulfide infrared dome as an example,the pure heat simulation is analyzed.The strength limit of ZnS material is greater than pure heat,and the dome can enter the constrained state.In the thermal test the dome did not burst,which proves that this method can be used for the selection of dome materials. |
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| Keywords: | pure thermal stress fast force judgement freedom status infrared dome |
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