Textile Ceramic,Fabric Ceramic,Alumina Ceramic Guide,Ceramic Textile Yixing Guangming Special Ceramics Co.,Ltd , https://www.yxgmtc.com
Textile Ceramic,Fabric Ceramic,Alumina Ceramic Guide,Ceramic Textile Yixing Guangming Special Ceramics Co.,Ltd , https://www.yxgmtc.com
Interpretation of "Calibration Specification for Drop Hammer Impact Tester"
The drop hammer impact tester is available in two main types: non-metallic and metallic. These devices are widely used across various industries such as highways, railways, water conservancy, construction, building materials, chemicals, smelting, and steel production. They play a crucial role in assessing the impact resistance of products.
Although several national standards were issued before 2008, including JB/T9389-2008 for non-metallic drop hammer impact testers, GB/T5137.1-2002 for automobile safety glass testing, GB/T8363-2007 for ferritic steel drop hammer testing, and GB/T11548-1989 for rigid plastic sheet impact resistance, there was no specific technical standard for the performance of drop hammer impact testers at that time.
With the increasing use of these instruments and the need for standardized procedures, the development of calibration specifications became essential. In 2009, the Henan Provincial Institute of Metrology, Shanghai Institute of Metrology and Testing Technology, and Chengde Jinjian Testing Instrument Co., Ltd. formed a team to draft the calibration specification. It was approved by the National Strength Hardness Measurement Committee in 2012 and officially released on January 23, 2014, becoming effective from April 23, 2014.
The calibration specification outlines key metrological characteristics of the instrument, including workbench level, guide verticality, impact point deviation, drop hammer radius, surface roughness, hardness, and energy calibration. Each parameter has specific measurement methods and acceptable tolerances to ensure consistency and accuracy during testing.
For example, the workbench must be level and stable to ensure accurate impact positioning. The guide's verticality ensures the drop hammer moves straight, while the impact point deviation measures how consistently the hammer hits the sample. The drop hammer’s radius, roughness, and hardness also affect the test results and are measured using appropriate tools.
Energy calibration involves measuring the mass and velocity of the drop hammer. Kinetic energy is calculated using the formula $ E = \frac{1}{2}mv^2 $. Energy loss can be determined by comparing the theoretical energy with the actual energy measured during the fall. This helps ensure that the device delivers consistent and reliable results.
During calibration, it's important to consider factors like air resistance, which becomes negligible when the drop height is below 2 meters. Also, the hardness of the hammer should be checked only when necessary, as repeated tests may alter its surface.
This specification applies to various impact testing machines, including non-metallic and metallic drop hammer testers, falling ball testers, dart testers, and luggage testers. While some parameters like workbench stiffness or assembly methods are not included due to complexity, they should still be considered during testing.
Overall, this calibration specification ensures that drop hammer impact testers operate accurately and reliably, providing consistent and meaningful test results across different industries.
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