拉伸载荷下降落伞织物微观力学的原位成像
In Situ Imaging of Parachute Textile Micro-Mechanics Under Tensile Load
AI总结：
本研究利用原位X射线显微断层成像技术探究两种常用降落伞尼龙织物的拉伸微观力学，通过学习辅助分割追踪丝束特性，揭示织物结构与细观力学的关联及预张力的影响，量化孔隙率变化并验证孔隙张开几何模型。
摘要：
本研究采用原位X射线显微断层成像技术，研究了降落伞织物在拉伸载荷下的微观力学特性。研究针对降落伞系统中常用的两种尼龙织物——MIL-C-7020H Type III和MIL-C-44378(GL) Type II展开实验。实验使用可径向加载织物的定制装置对织物施加递增张力，并在稳定载荷条件下依次对微观结构进行成像。研究采用学习辅助分割技术和定制处理流程对显微断层图像进行处理，该流程可在三维数据集上追踪单根丝束的位置和形态特性。研究利用所得结果重建了丝束的微观尺度特性和细观尺度应变。研究结果揭示了织物结构与细观力学性能之间存在直接关联，发现制造过程中的经丝束预张力会影响丝束的解卷曲和织物应变的各向异性。研究还量化了面孔隙率随张力增加的变化规律，并验证了递增载荷下孔隙张开的几何模型。
英文摘要：
Micro-mechanics of parachute fabrics under tensile loads is studied using in situ X-ray micro-tomography. Results are presented for two nylon textiles commonly used in parachute systems, MIL-C-7020H Type III and MIL-C-44378(GL) Type II. Textiles are subjected to incremental tension using a custom apparatus that loads the fabric radially, and the microstructure is imaged sequentially at steady load conditions. Micro-tomography images are processed using learning-aided segmentation and a custom processing pipeline that tracks the locations and morphological properties of individual tows on 3-D datasets. Results are used to reconstruct tow micro-scale properties and meso-scale strains. Our findings reveal a direct relation between the fabric architecture and the meso-scale mechanics. Warp tow pretensioning during manufacturing is found to affect decrimping and the anisotropy of the textile strains. Areal porosity increase with tension is quantified and a geometric model for pore opening under incremental load is validated.
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