GB/T 32493-2016 in English

1. Standard Overview

GB/T 32493-2016 standard specifies the terms and definitions, test principles, test equipment and conditions, test steps, data processing and test reports for the determination of the anti-ballistic performance of fiber-reinforced composite materials by the penetration specific energy absorption method.

This standard is applicable to the test and evaluation of the anti-fragmentation performance of various fiber-reinforced resin-based composite materials, and other materials can also refer to it.

2. Test Principle

The test measures the incident velocity of the rigid projectile before it penetrates the target plate and the residual velocity after it penetrates the target plate, and calculates the kinetic energy loss of the rigid projectile as the penetration energy absorption value of the target plate. The ratio of the penetration energy absorption value to the target plate surface density is the penetration specific energy absorption of the target plate under test.

• Ea_b — Energy absorbed by target penetration (unit: joule)
• ρA — Target surface density (unit: kilograms per square meter)

3. Experimental equipment and conditions

The test equipment includes: test firearms, speed measuring targets, chronographs and target stands. It is recommended to use a 12.7mm caliber ballistic gun to fire a 4.5g steel ball, which is made of high-carbon chromium bearing steel and meets the requirements of GB/T 308.1.

The test environment conditions are indoor environments, and the target plate state adjustment should comply with the provisions of GB/T 1446.

4. Data processing and evaluation indicators

Calculate the incident velocity and residual velocity according to the formula in Appendix B, and calculate the penetration energy absorption and penetration specific energy absorption of the target plate by formula (1) and formula (2) respectively.

5. Implementation suggestions

1. Ensure that the calibration of the test equipment meets the requirements and the velocity measurement system is regularly compared and calibrated.
2. Select the appropriate projectile and shooting distance to ensure the acquisition of effective penetration data.
3. Perform the test strictly according to the incident angle specified in the standard (recommended to be 0°), and special circumstances need to be recorded and noted.
4. Pay attention to environmental condition control to ensure the target plate is stable.