1 .Background Introduction

In the field of performance research and quality control of rubber materials, dynamic fatigue testing is a key link. The ASTM D430 standard provides authoritative specifications for dynamic fatigue testing of rubber, and the GA-1033 rubber Demacia flex crack tester is a powerful tool for implementing the standard. The two work closely together to promote the development of the rubber industry.

2. ASTM D430 standard: the cornerstone of test specifications

The ASTM D430 standard (Standard Test Methods for Rubber Deterioration-Dynamic Fatigue) focuses on evaluating the ability of soft rubber materials to resist dynamic fatigue. Due to the complex working conditions of rubber products in actual use, although the standard cannot accurately correlate the test results with the actual use, it can provide data for comparative evaluation of the dynamic fatigue resistance of rubber and rubber-fabric composite materials.

The standard covers three test methods, using three different instruments: Scott Flexing Machine, DeMattia Flexing Machine and E. аз. DuPont de Nemours and Co. Flexing Machine. Taking the DeMattia Flexing Machine test method (Method B) as an example, its test principle depends on the selected strain type. The tensile or bending strain can be achieved by adjusting the fixed and movable fixtures to simulate the stress conditions of rubber in actual applications. In terms of specimen preparation, the tensile fatigue crack test uses the Die C dumbbell specimen in ASTM D412, and the bending test uses a molded specimen of a specific shape, and has strict requirements on the specimen thickness measurement, preparation process and surface quality. During the test, it is necessary to accurately adjust the fixture position and the eccentric connecting rod length, control the degree of specimen stretching or bending, record the time of crack occurrence and the final crack development, and evaluate the results according to the standard rating table to calculate the number of cycles required to reach a specific crack degree. По същото време, the standard also has clear provisions for test conditions such as test temperature and specimen adjustment time to ensure the reliability and comparability of the test results.

3. GA-1033 Tester: Guarantee of Efficient Testing

GA-1033 Rubber Demacia Flex Crack Tester is designed and manufactured in strict accordance with GB/T13934, JIS K6301, ASTM D813, D430, ISO 132 and other domestic and international standards. Its working method is to continuously bend the sample after clamping it, and evaluate or compare the flexural resistance of the rubber material by observing the degree of cracking of the sample
The tester has many practical features in design. The sample specifications are fixed to 154×25±1×6.3±0.15mm, the maximum clamp spacing is 75 +1мм, the reciprocating stroke is 57 + 0.5мм, and the test speed is 300±10 times/min (preferably stepless speed regulation), which can adapt to different testing needs. The equipped LCD counter can display the number of cycles from 0 да се 999,999, which is convenient for accurately recording test data. The instrument is equipped with 12 test stations, which can test multiple samples at a time, значително подобряване на ефективността на теста. In terms of operation, the start, Спри се, zeroing and other functions can be realized through simple buttons, which is easy to operate. In practical applications, it can be used for quality inspection of rubber products such as automobile tires and rubber seals, helping enterprises to find material problems in time and optimize product performance.