Small-scale laboratory experiments on the indentation failure of polycrystalline ice in compression: Main results and pressure distribution
Small-scale laboratory experiments on the indentation failure of polycrystalline ice in compression: Main results and pressure distribution
复制标题
多晶冰压缩压痕破坏的小规模室内实验：主要结果和压力分布
DOI：
10.1016/j.coldregions.2010.11.002
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发表时间：
2011
影响因子：
4.1
通讯作者：
R. Taylor
中科院分区：
文献类型：
--
作者：
J. Wells;I. Jordaan;A. Derradji;R. Taylor
通过室内压入试验，研究了冰在压入过程中的破坏过程和冰-压头界面处的压力分布。试验是在20×20× 10 cm的冰试样上用20 mm压头进行的。样品由多晶冰制成，粒度约为4 mm。测试设置包括使用触觉压力传感器测量压痕部位的局部压力分布。发现该区域由与试验期间发现的平均压力相比压力非常高的隔离区组成。在整个测试过程中，这些压力峰值的强度经常变化，类似于在中等和全尺寸相互作用期间观察到的行为。压力分布表明，局部剥落的释放之前的压力建立，然后在总压力以及接触面积的减少。周期性载荷破碎的孤立周期伴随着周期性载荷下降和接触面积的定期减少。在这种情况下，压力分布显示了一个集中的压力区域，该区域在整个破碎事件中保持相对恒定，这支持了与受损层中的活动相关的动态的想法。
Laboratory indentation tests were performed with the objective of studying processes of ice failure during indentation and the pressure distribution at the ice-indenter interface. The tests were performed using a 20-mm indenter on ice specimens with dimensions of 20×20×10cm. Specimens were made of polycrystalline ice with a grain size of ~ 4mm. The test setup included the use of a tactile pressure sensor to measure the local pressure distribution at the indentation site. This area was found to consist of isolated zones of very high pressure compared to the average pressures found during the tests. These peaks in pressure were often seen to vary in intensity throughout the test, analogous to the behavior seen during medium and full-scale interactions. The pressure distribution showed that the release of localized spalls are preceded by a build-up of pressure and followed by a decrease in total pressure as well as contact area. Isolated periods of cyclic-load crushing were accompanied by periodic load drops and regular decreases in contact area. In this case, the pressure distribution showed a centralized area of pressure that remained relatively constant throughout the crushing event, which supports the idea of dynamics associated with activity in the damaged layer.