长桁与蒙皮脱粘对复合材料加筋板承载能力影响分析

复合材料结构在制造和使用过程中,难免产生分层损伤,这些损伤都会在不同程度上影响结构的承载能力。针对复合材料加筋板,采用有限元动态显式分析方法,分析长桁与蒙皮脱粘面积对加筋壁板结构屈曲和后屈曲承载能力的影响。在ABAQUS商业化有限元分析软件及其二次开发平台上,利用用户自定义材料(VUMAT)的方法对材料性能进行连续衰减,实现加筋板轴压载荷作用下的渐进式失效分析。建立了脱粘面积与结构承载能力之间的关系,研究结果可为合理制定复合材料构件缺陷验收标准和结构修理容限提供分析依据。

Influence analysis of stringer-skin debonding on load-bearing capacity of stiffened composite panel

Composite structure is prone to damage in the process of manufactory and service. This damage can influence the load-bearing capability of the structure. In this paper, stiffened composite panel with stringer-skin debonding was studied using finite element dynamic explicit analysis technique. The VUMAT subroutine was adopt to degrade material stiffness consecutively while damage occurred. The progressive analysis of panel under axial compressive load was conducted. Parameter analysis of debonding area was done. The relationship between failure load and debonding size was built. The study of this paper can provide analytic basis for establishing standards of eligibility and repair tolerance for composite structure.