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详细介绍了装配在 Instron 1251型电液伺服式试验机上进行断裂系数 J 积分值自动连续测定和控制的一套系统。内容包括系统工作原理和结构、主要电路、系统操作和数据处理等。机器在应变控制进行试验,将载荷电压讯号送到一台单参量时间自动积分仪进行时间积分,利用光电转换和整形器将正比于积分量的伺服电机转数变换为规整的方波脉冲,经计数控制后,一方面由带设定计数控制的电磁计数器进行计数,另一方面由一套二——十进制计数器作译码显示,并用16套双向电子开关控制二——十进制电阻解码网络进行数——模转换,经电压放大后送到记录仪连续记录载荷的时间积分量变化曲线。利用这套系统,可以在实验过程中自动连续测定 J 积分值,大大减化了 J 积分测定的数据处理,应用设定计数控制能实现任意设定 J 积分值的自动控制实验,为准确地测定条件开裂 J 积分值提供了方便。文内给出了应用这套系统的 J 积值计算关系式和恒定 J 积分值控制关系式。此外,介绍的系统也可以是用于其它任何单参量时间积分量的自动连续测定和控制。图11幅,表1个,参考文献4种。
A system of automatic continuous measurement and control of the integral value of breaking coefficient, J, assembled on an Instron 1251 electro-hydraulic servo testing machine is described in detail. The content includes system principle and structure, main circuit, system operation and data processing. Machine in the strain control test, the load voltage signal is sent to a single parameter time automatic integrator for time integration, the use of photoelectric conversion and shaper will be proportional to the integral amount of servo motor revolutions converted to a regular square wave pulse, the Count control, on the one hand by the set counter with the electromagnetic counter count, on the other hand by a set of two - decimal counter decoding display, and 16 sets of two-way electronic switch control two-decade resistance decoding network number - Analog conversion, after voltage amplification sent to the recorder continuous record of load time integral curve. By using this system, the J integral value can be automatically and continuously measured during the experiment, greatly reducing the data processing of the J integral determination, and the application of automatic control experiment of setting the J control integral value can be realized by using the setting counting control. In order to accurately measure Conditionally cracked J-integral provides convenience. The article gives the control system of J-value calculation and constant J-integral control using this system. In addition, the system described can also be used for automatic continuous measurement and control of any other one-parameter time integration. Figure 11, Table 1, 4 kinds of references.