1, according to the standard:
(1) GB8171-87 "Mechanical Impact Fracture Test Method Using Buffer Material"
(2) GB/T4857.5 Drop Test Method for Transport Packages
(3) GB/T4857.10-1992 Horizontal Impact Test Method for Transport Packages
(4) ISO2248, ISO2244, ASTM D3332
2, supporting equipment:
(1) Various types of drop testing machines
(2) Various types of impact testing machines (including: vertical impact testing machines, pendulum horizontal impact testing machines, inclined impact testing machines, etc.)
(3) It can also be used as optional material for cushioning material impact tester (limited by the size of sliding table, the product dimensions should be less than 150mm*150mm*200mm)
3, system composition
(1) Computer
(2) High-speed data acquisition card
(3) Accelerometers
(4) Charge amplifier
(5) Speed ​​detector
4, system function
(1) In addition to giving the time history of the acceleration signal, the maximum value of the acceleration, and the pulse width, according to ASTM D3332, the impact response of the wearing part and the maximum impact response spectrum of the impact signal are given.
(2) In conjunction with a drop tester, determine the fragility of the product in the package, analyze the cause of the product breakage, or conduct a prototype test.
(3) In conjunction with the impact tester, for the selected cushioning material, the critical acceleration and critical speed variation of the product breakage are measured. Used for buffer packaging design.
(4) Cooperate with the impact tester to determine the fragility and breakage boundary of the product, including the critical acceleration and the critical speed, under a specific pulse (determined by the function of the tester, such as semi-sine, trapezoidal, post-peak zigzag pulses). Change volume boundary for buffer packaging design;
(5) In conjunction with the impact material impact tester, test the brittle and critical speed variations of small electromechanical products such as mobile phones and hard disks for selected buffer materials;
(6) When the system is used for teaching, it can simulate the impact process when the product is subjected to rectangular pulse, half sine pulse, post-peak sawtooth pulse and triangle pulse in the process of dropping and the shock response of the wearing parts under the impact, the maximum impact Response spectrum and breakage boundary curve, so that students can deeply understand the product damage mechanism;
(7) When the system is used for teaching, students can set up multiple experiments: product damage mechanism demonstration experiment, maximum impact response spectrum and application test, analog-to-digital conversion and data acquisition experiment, analog filtering and digital filtering experiment, system characteristics and Impact response and non-distortion test experiment, product critical acceleration and critical speed variation test experiment, etc.
5, system features:
(1) It can reliably collect impact acceleration in any case --- time signal
(2) Provide a variety of FIR digital filters to filter the acceleration signal to ensure that the signal will not be distorted and accurately determine the product's fragility
(3) Unique database technology automatically records all the information for each test query
(4) Fully named data files without human intervention
(5) A multi-line tool, which can place multiple curves on a single chart, providing convenience for studying and comparing the vulnerability of products in various situations.
(6) Perfect experiment report program. Press the experiment report button, the experimental data automatically enters the Word version of the experimental report.
Shan Jingmin, Software Engineering Institute, Shaanxi University of Science and Technology
(Shan Jingmin: Professor of Shaanxi University of Science and Technology, graduated from the Department of Precision Instruments, Tianjin University. From 1986 to 1988, he went to Kumamoto University in Japan to specialize in testing and control of mechanical engineering. He has visited the United States several times, mainly engaged in testing and software development, especially impact testing. System development.
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