Translaminar Fracture in a Mini-Protruded Compact Tension Specimen: A Dataset of Micro-Scale Tomograms of a Thin-Ply Carbon Fibre-Epoxy Composite acquired via Synchrotron Radiation Computed Tomography During In-Situ Loading

In this study, we developed a scaled-down “mini-protruded compact tension specimen” to facilitate in-situ tensile testing coupled with synchrotron radiation computed tomography (SRCT). This innovative design provides valuable insights into in-situ translaminar damage mechanisms, significantly enhancing the accuracy of data used in finite element models.

The specimen is made of HS40 carbon fibres and ThinPregTM 736LT epoxy resin, with the layup of [902/0/902/0/902/0/902]. The translaminar fracture experiments were conducted under continuous loading and scanning using ultra-fast SRCT at the Swiss Light Source (SLS) TOMCAT beamline (Paul Scherrer Institut in Villigen, Switzerland). A polychromatic beam with an energy of 24 keV was used. The achieved voxel size was 800 nm, and 1000 projections per scan and 2 ms exposure time were acquired per scan. The GigaFRoST camera served as the detector. The scans were reconstructed into 3D volumes using the SLS’s in-house absorption-based algorithm (Gridrec) for critical loading steps during a test—both before and after a load drop (detailed in the accompanying Excel file). The tensile loading was exerted on the specimen at a rate of 0.2 mm/min until failure during scanning with the Deben CT500.

本研究开发了一款缩尺型「微凸紧凑拉伸试样」，以便于开展与同步辐射计算机断层扫描（Synchrotron Radiation Computed Tomography，SRCT）联用的原位拉伸测试。该创新设计可为原位穿层损伤机制研究提供宝贵视角，显著提升有限元模型所用数据的准确性。

该试样采用HS40碳纤维与ThinPregTM 736LT环氧树脂制备，铺层结构为[902/0/902/0/902/0/902]。层间断裂实验于瑞士维利根保罗谢尔研究所的瑞士光源（Swiss Light Source, SLS）TOMCAT光束线站开展，采用超快SRCT技术完成连续加载与同步扫描。实验使用能量为24 keV的多色光束，单次扫描的体素尺寸达800 nm，每轮扫描采集1000幅投影图像，曝光时长为2 ms，探测器选用GigaFRoST相机。针对测试过程中载荷跌落前后的关键加载阶段，采用瑞士光源自研的基于吸收原理的Gridrec算法，将扫描数据重建为三维体数据，详细信息见随附Excel文件。测试过程中，通过Deben CT500试验机以0.2 mm/min的加载速率对试样施加拉伸载荷，直至试样发生断裂。