GB/T 38338-2019 in English
VALIDTest method for fracture toughness of carbon materials
- Issued on:2019-12-10
- Implemented on:2020-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
《GB/T 38338-2019炭素材料断裂韧性测定方法》由TC183（全国钢标准化技术委员会）归口，TC183SC15（全国钢标准化技术委员会炭素材料分会）执行，主管部门为中国钢铁工业协会。
Introduction
GB/T 38338-2019 Standard Overview
GB/T 38338-2019 "Determination Method of Fracture Toughness of Carbon Materials" was issued on December 10, 2019 and officially implemented on July 1, 2020. The standard was jointly approved by the State Administration for Market Regulation and the National Standardization Administration, and aims to standardize the determination of fracture toughness of carbon materials at room temperature.
Background of Standard Formulation
With the widespread application of carbon materials in multiple industries, the evaluation of their mechanical properties has become crucial. Fracture toughness is an important indicator to measure the ability of materials to resist crack propagation, which directly affects the service life and safety of materials. Therefore, the formulation of a unified standard is of great significance to ensure product quality and safety.
Technology Evolution Analysis
GB/T 38338-2019 is based on international advanced test methods and optimized in combination with the characteristics of domestic carbon materials. Compared with the old standard, this version has significant improvements in specimen preparation, test equipment accuracy and data processing.
Instrument requirements
| Equipment name | Measuring range | Accuracy requirements |
|---|---|---|
| Vernier caliper | 0 mm-300 mm | 0.02 mm |
| Micrometer | 0 mm-25 mm | 0.01 mm |
| Image measuring instrument | - | 0.001 mm |
Detailed explanation of the test steps
According to the standard requirements, the test steps include sample preparation, equipment calibration, loading test and data processing. The following is a description of the key steps:
- Sample preparation: The sample needs to be dried in a 105°C-110°C oven for 2 hours and cooled to room temperature for use.
- Equipment calibration: Ensure that the accuracy of measuring tools such as vernier calipers and micrometers meets the requirements.
- Loading test: The loading rate of the testing machine is 0.05 mm/min-0.1 mm/min, and the load-displacement curve is recorded.
Fracture toughness calculation formula
Fracture toughness (KIC) is calculated as follows:
Wherein, Pmax is the maximum load, a is the crack depth, and A is the support span and other parameters.
Implementation suggestions
Precautions in practical application
- Ensure that the equipment is calibrated regularly to ensure measurement accuracy.
- During the test, be sure to record the sample number, test conditions and operator information.
- When processing data, the numerical values are strictly rounded off in accordance with GB/T 8170.
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