{"title":"绳索加固飞艇围护结构极限承压性能的实验研究和精细数值模拟","authors":"Shiping Li, Wujun Chen, Longlong Chen, Yinbo Song, Jianhui Hu, Haitao Zhao, Daxu Zhang","doi":"10.1177/13694332241246376","DOIUrl":null,"url":null,"abstract":"Stratospheric airships require a lightweight envelope to contain lighter-than-air buoyancy gas, making the lightweight design and pressure-bearing performance of the envelope structure a key research issue. The stress state at different cross-sectional positions of the airship envelope structure is different, resulting in a low utilization rate of the overall material performance of the envelope structure. This paper proposes a design scheme for reinforcing envelope structures with sliding reinforcing cable to improve the bearing capacity of the composite fabric structure while reducing its weight, ultimately achieving the optimal strength-to-weight ratio. Two types of composite fabric structures (A-airship and B-airship) were subjected to inflatable burst tests, and the strain changes in the envelope gores were analyzed by digital image correlation. Through re-assembly of the broken composite fabric pieces and analysis of their tear textures, crack origination positions, failure causes, and the stress behavior and state at the failure position were identified. An envelope structural model with consideration of the cutting pattern effect was established, allowing the stress distribution of the envelope to be analyzed and the damage positions to be more accurately predicted. Based on the analysis of the ultimate pressure-bearing performance of an airship envelope structure, a novel idea of incorporating coupled tensile-shear stress into the strength criterion was proposed. Through the data in the study and existing references, it is verified that the strength criterion can accurately predict the ultimate pressure-bearing performance of the envelope structure.","PeriodicalId":50849,"journal":{"name":"Advances in Structural Engineering","volume":"49 1","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental study and refined numerical simulation of ultimate pressure-bearing performance of rope-reinforced airship envelope structures\",\"authors\":\"Shiping Li, Wujun Chen, Longlong Chen, Yinbo Song, Jianhui Hu, Haitao Zhao, Daxu Zhang\",\"doi\":\"10.1177/13694332241246376\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Stratospheric airships require a lightweight envelope to contain lighter-than-air buoyancy gas, making the lightweight design and pressure-bearing performance of the envelope structure a key research issue. The stress state at different cross-sectional positions of the airship envelope structure is different, resulting in a low utilization rate of the overall material performance of the envelope structure. This paper proposes a design scheme for reinforcing envelope structures with sliding reinforcing cable to improve the bearing capacity of the composite fabric structure while reducing its weight, ultimately achieving the optimal strength-to-weight ratio. Two types of composite fabric structures (A-airship and B-airship) were subjected to inflatable burst tests, and the strain changes in the envelope gores were analyzed by digital image correlation. Through re-assembly of the broken composite fabric pieces and analysis of their tear textures, crack origination positions, failure causes, and the stress behavior and state at the failure position were identified. An envelope structural model with consideration of the cutting pattern effect was established, allowing the stress distribution of the envelope to be analyzed and the damage positions to be more accurately predicted. Based on the analysis of the ultimate pressure-bearing performance of an airship envelope structure, a novel idea of incorporating coupled tensile-shear stress into the strength criterion was proposed. 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引用次数: 0
摘要
平流层飞艇需要轻质围护结构来容纳轻于空气的浮力气体,因此围护结构的轻质设计和承压性能成为研究的重点。飞艇围护结构不同截面位置的应力状态不同,导致围护结构整体材料性能利用率低。本文提出了一种用滑动加强索加强围护结构的设计方案,在减轻重量的同时提高复合织物结构的承载能力,最终达到最佳的强度重量比。对两种复合织物结构(A 型艇和 B 型艇)进行了充气爆破试验,并通过数字图像相关分析了包络孔的应变变化。通过重新组装断裂的复合织物碎片并分析其撕裂纹理,确定了裂纹的起源位置、破坏原因以及破坏位置的应力行为和状态。建立了考虑了切割模式效应的包络结构模型,从而可以分析包络的应力分布,更准确地预测破坏位置。在分析飞艇围护结构极限承压性能的基础上,提出了将拉剪应力耦合纳入强度准则的新思路。通过研究数据和现有参考文献,验证了强度准则可以准确预测围护结构的极限承压性能。
Experimental study and refined numerical simulation of ultimate pressure-bearing performance of rope-reinforced airship envelope structures
Stratospheric airships require a lightweight envelope to contain lighter-than-air buoyancy gas, making the lightweight design and pressure-bearing performance of the envelope structure a key research issue. The stress state at different cross-sectional positions of the airship envelope structure is different, resulting in a low utilization rate of the overall material performance of the envelope structure. This paper proposes a design scheme for reinforcing envelope structures with sliding reinforcing cable to improve the bearing capacity of the composite fabric structure while reducing its weight, ultimately achieving the optimal strength-to-weight ratio. Two types of composite fabric structures (A-airship and B-airship) were subjected to inflatable burst tests, and the strain changes in the envelope gores were analyzed by digital image correlation. Through re-assembly of the broken composite fabric pieces and analysis of their tear textures, crack origination positions, failure causes, and the stress behavior and state at the failure position were identified. An envelope structural model with consideration of the cutting pattern effect was established, allowing the stress distribution of the envelope to be analyzed and the damage positions to be more accurately predicted. Based on the analysis of the ultimate pressure-bearing performance of an airship envelope structure, a novel idea of incorporating coupled tensile-shear stress into the strength criterion was proposed. Through the data in the study and existing references, it is verified that the strength criterion can accurately predict the ultimate pressure-bearing performance of the envelope structure.
期刊介绍:
Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.