GB/T 38537-2020 in English
VALIDUltrasonic testing method for fiber reinforced resin matrix composites—C-scan method
- Issued on:2020-03-06
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
《GB/T 38537-2020纤维增强树脂基复合材料超声检测方法 C扫描法》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
Interpretation of the core content of the standard
Principle of the method
The standard specifies three ultrasonic C-scan methods:
- Contact pulse reflection method: Assess quality by the change in the amplitude of the defect reflection wave
- Water immersion pulse reflection method: Detect the change in the bottom echo using a water-coupled medium
- Water spray pulse penetration method: Assess quality based on the change in the intensity of the transmitted wave
Equipment technical requirements
| Components | Key indicators | Standard requirements |
|---|---|---|
| Ultrasonic detector | Dynamic range | ≥26dB |
| Probe | Frequency range | 0.5-10MHz |
| Scanning system | Positioning accuracy | ≤0.3mm |
Technical evolution analysis
Compared with the old version of the standard, the 2020 version has the following major improvements:
- New Water spray penetration method detection scheme
- Clarify the accuracy requirements of the mechanical scanning system
- Refine the inspection specification for curved surface components
Implementation suggestions
Typical application cases
Inspection of aviation composite materials: The carbon fiber wing of a certain type of aircraft was inspected by water immersion pulse reflection method, and a 5MHz focused probe was selected. Three Φ6mm delamination defects were found. After anatomical verification, the error with the C-scan result was <0.5mm.
Key control points
- The coupling agent temperature should be controlled at 10-35℃
- Special comparison test blocks are required for curved surface components
- The scanning interval should not exceed 1/2 of the 6dB landing point of the defect
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