考虑界面损伤的立式贮存药柱结构完整性研究

Structural Integrity of Vertical Storage Grain by Considering Interface Damage

关键词:  立式贮存  粘接界面  粘接接触  充气内压  药柱完整性

Key words:  Vertical storage  Adhesive interface  Adhesive contact  Internal inflation pressure  Grain integrity

摘要:

通常的立式贮存条件下固体火箭发动机药柱的结构完整性研究并没有考虑界面损伤。本文以某型固体火箭发动机模型为例，在推进剂与绝热层之间设置粘接接触，对比分析了有无界面损伤时发动机在固化降温、充气内压和重力载荷的联合作用下的应力特性。结果表明：界面损伤的存在导致推进剂/绝热层界面这个薄弱环节更危险；考虑界面损伤时，靠近人工脱粘层根部位应力随着充气内压增大呈先增大后减小趋势；在充气内压逐渐增大过程中，推进剂药柱与绝热层之间考虑界面损伤时，推进剂药柱的危险点由靠近人工脱粘层根部部位变为垂直于轴向的初始点。

Abstract:

Common structural integrity studies of vertical storage solid rocket motor grains lack the consideration of interface damage. Based on a certain solid rocket motor model， the adhesive contact is set between the propellant and the thermal insulation layer to consider the interface damage. The stress characteristics of the motor under the combination of solidification and cooling， inflation pressure and gravity load are compared and analyzed with or without interface damage.The results show that the existence of interface damage makes the weak link of the propellant/insulation layer interface more dangerous. When considering the damage at the interface， the stress near the root of the artificial debonding layer increases first and then decreases with the increase of the inflation pressure. In the process of increasing the internal pressure of inflation， when considering the interface damage between the propellant grain and the thermal insulation layer， the dangerous point of the propellant grain changes from the position near the root of the artificial debonding layer to the initial point perpendicular to the axial direction.