低温点火条件下固体发动机组合药柱的粘接界面力学响应分析

In order to study debonding damage of bonding interface of the mixed grain under low-temperature ignition conditions, taking a solid motor as an example, the mechanical response characteristics and interface damage evolution of the mixed grain under low-temperature ignition conditions were analyzed based on cohesion model. The analysis results show that there is no pressure in the gap of case and coating, the mixed grain under the low-temperature ignition pressure load deforms greatly, resulting in interface structure failure due to exceeding the allowable stress limit. The sustaining /accelerating section of the grain is the weak point of structure failure. At the same time, the effects of interface mechanical properties and grain modulus on interface damage distribution were analyzed. Structural integrity of the grain can be significantly improved with the increase of interface strength and fracture energy, but with the increase of interfacial stiffness, interfacial debonding will still occur; the interfacial debonding range is reduced with the decrease of the Young's modulus, but the equivalent strain of the sustaining section of the grain become significantly large.