GB/T 38535-2020 in English
VALIDTest method on fiber reinforced resin matrix composites by industrial computed tomography (CT)
- Issued on:2020-03-06
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 38535-2020纤维增强树脂基复合材料工业计算机层析成像（CT）检测方法》由TC39（全国纤维增强塑料标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Analysis of the core content of the standard
| Technical elements | Parameter requirements | Detection significance |
|---|---|---|
| Spatial resolution | ≥2.0lp/mm(10% modulation) | Ensure the detectability of micron-level defects |
| Density resolution | ≤0.5% | Distinguish material density differences |
| Penetration range | 10%-20% | Optimal signal-to-noise ratio and contrast balance |
Key technical requirements
1. Detection system configuration
The standard requires that the industrial CT system must include four major modules: ray source, detector system, mechanical motion control and computer system. Among them:
- The linear array detector system must have the function of adjustable slice thickness
- The number of projections collected per circle by the array detector system is ≥360
2. Typical defect identification
Quantitatively determine the defect type by the defect CT density ratio (X):
Case: In the carbon fiber/epoxy resin sample, when X=45.5%, it is a delamination defect (see Appendix D Figure f)
Calculation formula: X=(AB)/A×100%, where A is the CT value of the non-defective area, and B is the CT value of the defective area
Implementation suggestions
1. Process parameter optimization
It is recommended to use the optimal magnification formula: Mopt=1+(d/a)2, where d is the detector unit size and a is the focal spot size
2. Safety protection
Inspectors must:
- Obtain a radiation protection qualification certificate
- Wear a personal dosimeter (annual absorbed dose ≤20mSv)
- Perform regular health checks
Standard Evolution Analysis
This standard establishes a dedicated CT inspection method for fiber-reinforced composite materials for the first time. Compared with the general requirements of GB/T 29070:
- New material-specific parameters (such as penetration curve)
- Refine the quantitative defect determination method
- Specify the comparison sample production specifications
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