目的 明确飞机战伤结构损伤极限的内涵,建立损伤极限评估方法,为飞机结构战伤抢修提供理论依据。方法 依据 GJB 3897界定损伤极限概念,分析损伤等级与损伤极限尺寸的对应关系。基于破坏载荷、极限载荷与限制载荷的关联特性,提出战伤结构安全裕度利用原则,构建损伤结构剩余强度到损伤极限的映射关系。基于净截面断裂准则,建立拉伸载荷下典型金属壁板剩余强度评估与损伤极限计算方法。结果 开展典型金属壁板拉伸试验验证,剩余强度评估误差小于12.4%,且偏于安全,满足战伤评估工程需求。结论 损伤极限是特定条件下结构满足承载要求的最大损伤尺寸,所建评估方法可实现战伤结构损伤极限快速判定,为飞机结构战伤抢修决策奠定理论基础。
Abstract
This study aims to clarify the connotation of damage limit for aircraft battle-damaged structures and develop an evaluation method of damage limits, so as to provide a theoretical basis for the battle damage repair of aircraft structures. The concept of damage limit was defined according to GJB 3897, and the corresponding relationship between damage grades and damage limit sizes was analyzed. Based on the correlation among failure load, ultimate load and limit load, the utilization principle of structural safety margin after battle damage was proposed, and the mapping relationship from residual strength of damaged structure to damage limit was constructed. Based on the net-section fracture criterion, the residual strength evaluation and damage limit calculation methods of typical metal panels under tensile load were established. Tensile tests of typical metal panels were carried out for verification. The error of residual strength evaluation was less than 12.4% and the method was conservative, meeting the engineering requirements of battle damage assessment. Damage limit is the maximum damage size of structures meeting bearing requirements under specific conditions. The established evaluation method can realize the rapid determination of damage limit of battle-damaged structures and lay a theoretical foundation for the decision-making of structural battle damage repair of aircraft.
关键词
战伤评估 /
战伤修理 /
损伤结构 /
损伤极限 /
剩余强度 /
受拉壁板
Key words
battle damage evaluation /
battle damage repair /
damaged structure /
damage limit /
residual strength /
tension-dominant panel
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