GB/T 39487-2020 in English

Analysis of the core content of the standard

This standard establishes a scientific pipe shear strength evaluation system for the application of foaming structural adhesives in the fields of aerospace, automobile manufacturing, etc. The main technical features include:

Key technical implementation points

1. Specimen preparation specifications

Aluminum alloy casing (in accordance with GB/T3190) is used after phosphoric acid anodizing treatment (refer to HB/Z197-1991), and the glue layer filling amount is controlled within ±1g error. Film glue needs to be evenly applied, and powder glue should be fully filled.

2. Test system composition

Key equipment includes:
- Universal material testing machine (error ≤1%)
- Special fixture system (including bottom fixing fixture and axial extrusion mold)
- Precision cutting equipment (accuracy ±0.05mm)

Standard evolution and industry value

This standard fills the gap in the domestic test method of tube shear strength of foam structural adhesives. Its innovation is reflected in:
1. The first dual-specification casing system to adapt to different material systems
2. Clearly define the formula σ=F/(πDL) as a unified calculation basis
3. Specify the test condition of ambient humidity ≤65%

Implementation suggestions

1. It is recommended to establish a regular verification system for casing dimensions (recommended cycle 3 months)
2. For anisotropic materials, comparative tests in parallel/vertical texture directions should be added
3. The test report must include a description of the failure mode (cohesive failure/interface failure)