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A new drop weight impact machine for studying the fracture behaviour of structural concrete

机译：研究结构混凝土断裂行为的新型落锤式冲击机

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This paper describes the main characteristics of a new drop weight impact machine that has been specifically designed for studying the dynamic mechanical behaviour of structural concrete samples. Such equipment has been used to generate simple and measurable fracture processes under moderate to fast loading rates, as opposed to blast chambers, which produce complicated crack patterns that are difficult to analyze. The machine consists of two main parts, the mechanical structure and the data acquisition system. The former is just a hammer, guided by two robust columns, which can impact the specimen with energy up to 7860 J. The latter consists of piezoelectric force sensors, accelerometers and an optical fibre photoelectric sensor plus oscilloscopes and signal conditioners. The paper also presents the results of some preliminary tests that show the sensitivity of the work of fracture to the loading rate.
机译：本文介绍了一种新型的落锤式冲击机的主要特性，该机是专为研究结构混凝土样品的动态力学性能而设计的。与爆炸室不同，这种设备已被用来在中等至快速加载速率下产生简单且可测量的断裂过程，而爆炸室会产生难以分析的复杂裂纹模式。该机器包括两个主要部分，机械结构和数据采集系统。前者只是一个锤子，由两个坚固的立柱引导，可以以高达7860 J的能量冲击样品。后者由压电力传感器，加速度计和光纤光电传感器以及示波器和信号调节器组成。本文还介绍了一些初步测试的结果，这些结果表明了断裂功对加载速率的敏感性。

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