Shear creep analysis of solid rocket motor bonding interface and rapid prediction model**

During vertical storage of solid rocket motors, shear creep behavior occurred at the sidewall bonding interface due to self-weight load, threatening the structural safety and storage life of the motor. To study the shear creep characteristics of the bonding interface, shear creep tests were conducted on a shear interface test piece of a motor under various temperatures and stresses. An engineering criterion for the onset of nonlinear viscoelastic stage of the bonding interface was proposed, and a rapid prediction model for shear creep of motor bonding interface in linear viscoelastic stage was devised. Furthermore, the stress-time master curve of shear creep compliance at the bonding interface was established, revealing the variation trend of shear creep compliance during long-term creep process. The results showed that this rapid prediction model had simple construction, high accuracy and wide applicability, and could well predict short-term creep behaviour of bonding interface in linear viscoelastic stage. A method for structural integrity assessment of vertically stored solid rocket motors could be provided by using these research methods and results.