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Velocity effects in laboratory scale punch through experiments

机译：通过实验在实验室规模打孔中的速度效应

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Laboratory scale punch through tests on floating rubble consisting of plastic blocks were conducted. The motivation of using plastic blocks was to simplify the interpretation of results as the plastic blocks do not freeze together. The emphasis was on the methods used to derive the rubble material properties from results. In the experiments, a flat indentor platen penetrated the rubble. The indentor force as a function of its penetration was recorded. Different indentor velocities were used. The behavior of the rubble was related to the measured indentor force records. The results were compared with earlier laboratory scale punch through tests. The experiments showed, that punch through tests give results, that in some cases are difficult to interpret. The reason for this is mainly in the hydrodynamical effects arising with high indentor velocities. The results showed, that the existence of the rubble in the basin could change the hydrodynamical effects from the tests earlier used to capture them. It is shown that these effects can partly explain the shear rate dependency of the ice rubble observed in earlier work on punch through tests.
机译：在由塑料块组成的浮动瓦砾上进行了实验室规模的穿通测试。使用塑料块的动机是简化结果的解释，因为塑料块不会冻结在一起。重点是从结果中得出瓦砾材料性能的方法。在实验中，平坦的压头压板穿透了瓦砾。记录压头力与其穿透力的关系。使用不同的压头速度。瓦砾的行为与测得的压头力记录有关。将结果与较早的实验室规模穿通测试进行了比较。实验表明，通过测试可以得出结果，在某些情况下很难解释。其原因主要是由于压头速度高而产生的流体动力效应。结果表明，盆地中瓦砾的存在可以改变较早用于捕获岩石的水动力效应。结果表明，这些影响可以部分解释早期打孔试验中观察到的碎石的剪切速率依赖性。

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