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首页> 外文会议>3rd AIAA spacecraft structures conference 2016 >Effects of Damage on Long-Term Displacement Data of Woven Fabric Webbings under Constant Load for Inflatable Structures
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Effects of Damage on Long-Term Displacement Data of Woven Fabric Webbings under Constant Load for Inflatable Structures

机译：充气结构在恒定载荷下损伤对机织织物织带长期位移数据的影响

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摘要

Pristine and damaged high strength Kelvar and Vectran woven webbings under constant load were experimentally tested for creep behavior. Kevlar and Vectran fabric webbings are currently utilized in the restraint layer of several low earth orbiting pressurized inflatable space modules, and their use has been proposed in lunar and Mars outposts. Webbings have desirable strength to mass characteristics due to their constitutive yarn properties and weave architecture, and they are highly flexible for compact stowage. The utilization of webbings in inflatable modules carries risk due to the limited number of long-term end-of-life creep studies, and the possibility of webbing misalignment, damage, or failure within the restraint layer during deployment or nominal operations. The goal of this study is to generate and examine creep displacement data from pristine and damaged webbings to gain insight and better define service life parameters. Data from six groups of pristine webbings and five groups of damaged webbings were tested over a multiple year time period. Each group had a unique webbing length, load rating, applied load, and test period. Damage was defined by three categories of long narrow symmetric incisions of varying number and length, which were applied parallel to the constitutive warp yarns of the webbing. The effects of damage were determined by comparing displacement data of damaged webbings to data from baseline pristine webbings consisting of the same material. Study results indicate that all types of damage have limited effect on webbing displacement over time. Data indicate that damage initiates at points of vertical displacement where load carrying warp yarns unravel or fail and redistribute load. These effects are minor due to the relatively large number of load carrying warp yarns within typical webbings. In general, all pristine and damaged webbings consistently exhibit a global displacement wave pattern governed by applied load and the temperature within the test facility. Results are presented to increase the knowledge base of the creep behavior of webbing materials and to enhance designs of inflatable space structures for long-duration space missions.
机译：通过实验测试了在恒定载荷下原始的和损坏的高强度Kelvar和Vectran编织带的蠕变行为。凯夫拉尔纤维和Vectran织物织带目前被用于几个低地球轨道的加压充气空间模块的约束层，并且已在月球和火星前哨基地提出了使用它们的建议。织带由于其本构的纱线特性和织造结构而具有理想的强度对质量特性的强度，并且对于紧凑的存放具有很高的柔韧性。由于长期寿命终止蠕变研究的数量有限，并且在部署或名义操作期间，安全带未对准，损坏或在约束层内失效，因此在可充气模块中使用安全带会带来风险。这项研究的目的是从原始的和损坏的织带中生成和检查蠕变位移数据，以获取洞察力并更好地定义使用寿命参数。经过多年的测试，对来自六组原始织带和五组受损织带的数据进行了测试。每组都有唯一的织带长度，额定载荷，施加的载荷和测试时间。损伤是由三类不同数量和长度的狭长对称切口定义的，这些切口平行于织带的本构经纱施加。通过将损坏的安全带的位移数据与由相同材料组成的原始原始安全带的数据进行比较，可以确定损坏的影响。研究结果表明，随着时间的推移，所有类型的损坏对织带位移的影响均有限。数据表明，损坏是在承载经纱散开或失效并重新分配载荷的垂直位移点开始的。由于典型的织带中承载经纱的数量相对较多，因此这些影响很小。通常，所有原始的和损坏的织带始终显示出受置换载荷和测试设备内温度控制的整体位移波形。提出的结果可增加对安全带材料蠕变行为的了解，并增强用于长期太空任务的充气式空间结构的设计。

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