This dataset provides high-resolution X-ray computed tomography (X-CT) images obtained from tensile and fatigue tests, along with internal defect information extracted through Persistent Homology analysis. The dataset consists of the following components:

• Tensile folder
• Fatigue folder
• All_in_one_table.xlsx (summary table of all defect information)

Data Structure

Each folder is organized and uploaded according to the Sample Number in All_in_one_table.xlsx, and each sample contains subfolders with data corresponding to the IDs. For example, Fatigue_1.zip includes the data for IDs 1, 2, 3, and 4, which correspond to Sample Number 1 of Fatigue sheet in All_in_one_table.xlsx. The following example illustrates the structure of a Sample Number folder and its subfolders.

Fatigue_1/
└── ID_1/
    ├── 3d/                    # 3D visualization data
    ├── raw/                   # Original X-CT images
    ├── window_leveling/       # Processed X-CT images 
    ├── Birth Histogram.jpg    # Histograms of defect sizes
    └── Lifetime Histogram.jpg # Histograms of inter-defect distances

All-in-one Excel Table

The All-in-one Excel file contains two sheets: Tensile and Fatigue, each providing detailed defect-related and experimental data extracted from X-CT images using Persistent Homology.

Tensile Sheet

This sheet summarizes local strain and internal defect characteristics from tensile testing. Each row corresponds to a specific part of a specimen.

• Sample number / ID / Parts: Sample-level identifiers
• Local strain: Measured via Digital Image Correlation (DIC)
• Defect size and density: Number of voids per mm³ in the following ranges:
  • 0–3 (/mm³)
  • 3–6 (/mm³)
  • > 6 (/mm³)
• Void distribution:
  • D – Average inter-defect distance (μm)
  • V – Standard deviation or spread of defect distances

Fatigue Sheet

This sheet contains interrupted fatigue testing results, allowing analysis of fracture progression and crack-related characteristics.

• Sample ID / Stress (MPa): Basic test settings
• Interrupted point (cycles): Cycle count where test was paused
• Fractured point (cycles): Total cycles until failure
• Fracture progress (%): Progression toward final fracture
• Crack information:
  • Presence (Yes/No)
  • Count / Density / Shape
  • Thickness (mm) / Depth (mm) / Volume (mm³) (when available)
  • T-grade (Thickness grade): Classification of crack thickness
    • 0–0.15 mm → Grade 1
    • 0.15–0.30 mm → Grade 2
    • 0.30–0.45 mm → Grade 3
  • D-grade (Depth grade): Classification of crack depth
    • 0–0.30 mm → Grade 1
    • 0.30–0.60 mm → Grade 2
    • 0.60–0.90 mm → Grade 3
• Void density: Voids per mm³ in:
  • 0–12 (/mm³)
  • 12–24 (/mm³)
• Defect distribution:
  • Average inter-defect distance (μm)
  • Heterogeneity (μm) – variation in spacing

Experimental Overview

• Tensile Data
  Collected after tensile testing using Digital Image Correlation (DIC) equipment, providing localized strain measurements.
• Fatigue Data
  Collected after interrupted fatigue tests, allowing multiple stages of crack propagation to be captured within a specimen.