为高效分析滑行道桥在损伤情况下的安全通行能力,探究不同损伤情况下的滑行道桥响应参数,本文采用数值模拟的方法,建立飞机-滑行道桥耦合振动损伤模型,进行滑行道桥安全承载力学性能评估实验分析。根据相关规范,针对滑行道桥不同损伤类...为高效分析滑行道桥在损伤情况下的安全通行能力,探究不同损伤情况下的滑行道桥响应参数,本文采用数值模拟的方法,建立飞机-滑行道桥耦合振动损伤模型,进行滑行道桥安全承载力学性能评估实验分析。根据相关规范,针对滑行道桥不同损伤类型(整体损伤、支座损伤、局部裂缝),以5%、10%、15%、20%、25%量化滑行道桥整体刚度损伤程度和20%、40%、60%、80%、100%量化支座刚度损伤程度;根据预应力筋的位置,设置20、40、60、80、100 mm 5种裂缝深度来量化裂缝损伤。结合不同机型的荷载作用,探究分析不同工况下滑行道桥的2个响应参数(频率和跨中挠度),验证损伤分级可行性并进行相关滑行道桥安全承载能力分析。结果表明,不同损伤类型(整体损伤、支座损伤、局部裂缝)滑行道桥的频率和跨中挠度变化均与损伤程度呈现明显的相关性,且不同损伤类型对滑行道桥的结构响应有显著影响。展开更多
Received 7 August 2024;received in revised form 13 November 2024;accepted 18 November 2024 Available online 30 November 2024 Abstract The poor fracture toughness limits the widespread application of high-strength cast...Received 7 August 2024;received in revised form 13 November 2024;accepted 18 November 2024 Available online 30 November 2024 Abstract The poor fracture toughness limits the widespread application of high-strength cast Mg-Re-Zn alloys.Regulating the alloy microstructure,with phases such asα-Mg,blocky LPSO(long-period stacking order),and lamellar LPSO,offers various possibilities to enhance ductility by casting and heat treatment.This study categorizes different interface types concerning crack initiation,propagation,and ultimate fracture toughness.It distinctly presents the results of interface modulation related to alloy composition and heat treatment,elucidating the influence on crack initiation and propagation paths.Consequently,it proposes structural configurations rule and relevant heat treatment processes that can optimize and improve alloy fracture toughness.Blocky LPSO should have appropriate dispersion and size while avoiding lamellar LPSO.展开更多
文摘为高效分析滑行道桥在损伤情况下的安全通行能力,探究不同损伤情况下的滑行道桥响应参数,本文采用数值模拟的方法,建立飞机-滑行道桥耦合振动损伤模型,进行滑行道桥安全承载力学性能评估实验分析。根据相关规范,针对滑行道桥不同损伤类型(整体损伤、支座损伤、局部裂缝),以5%、10%、15%、20%、25%量化滑行道桥整体刚度损伤程度和20%、40%、60%、80%、100%量化支座刚度损伤程度;根据预应力筋的位置,设置20、40、60、80、100 mm 5种裂缝深度来量化裂缝损伤。结合不同机型的荷载作用,探究分析不同工况下滑行道桥的2个响应参数(频率和跨中挠度),验证损伤分级可行性并进行相关滑行道桥安全承载能力分析。结果表明,不同损伤类型(整体损伤、支座损伤、局部裂缝)滑行道桥的频率和跨中挠度变化均与损伤程度呈现明显的相关性,且不同损伤类型对滑行道桥的结构响应有显著影响。
基金supports from the National Key Research and Development Plan(Grant No.2021YFB3701100)the National Natural Science Foundation of China(Grant No.U2241231,No.52071206).
文摘Received 7 August 2024;received in revised form 13 November 2024;accepted 18 November 2024 Available online 30 November 2024 Abstract The poor fracture toughness limits the widespread application of high-strength cast Mg-Re-Zn alloys.Regulating the alloy microstructure,with phases such asα-Mg,blocky LPSO(long-period stacking order),and lamellar LPSO,offers various possibilities to enhance ductility by casting and heat treatment.This study categorizes different interface types concerning crack initiation,propagation,and ultimate fracture toughness.It distinctly presents the results of interface modulation related to alloy composition and heat treatment,elucidating the influence on crack initiation and propagation paths.Consequently,it proposes structural configurations rule and relevant heat treatment processes that can optimize and improve alloy fracture toughness.Blocky LPSO should have appropriate dispersion and size while avoiding lamellar LPSO.
