Improved simplified calibration procedure for a high-cycle accumulation model
Improved simplified calibration procedure for a high-cycle accumulation model
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改进了高循环累积模型的简化校准程序
DOI:
10.1016/j.soildyn.2014.12.011
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发表时间:
2015
影响因子:
4
通讯作者:
Triantafyllidis
中科院分区:
文献类型:
--
作者:
Wichtmann;Niemunis;Triantafyllidis
The high-cycle accumulation (HCA) model proposed by Niemunis et al.[16] predicts permanent deformations due to a drained cyclic loading with many small cycles (ie N≥ 10 3 cycles with strain amplitudes ε ampl≤ 10− 3). The strain amplitude is the most important influencing parameter of the rate of strain accumulation ε ̇ acc. Based on tests on a medium coarse sand, a square relationship ε ̇ acc~(ε ampl) 2 has been used in the HCA model so far. The new test results presented in this paper indicate, however, that the exponent of the amplitude-dependence may vary between 1.3 and 2.4, depending on the tested material. This comes out of 150 drained cyclic triaxial tests with 10 5 load cycles performed on 14 clean quartz sands with specially mixed grain size distribution curves. Consequently, an additional material constant C ampl has been introduced into the HCA model describing the amplitude dependence according to ε ̇ acc~(ε ampl) C ampl. The additional parameter requires a revision of the simplified calibration procedure proposed by Wichtmann et al.[24] which uses correlations between the HCA model parameters and granulometric (d 50, C u) or index properties (e min). Furthermore, the new cyclic test data reveal that the existing correlations are inappropriate for well-graded granular materials (C u≥ 5). Enhanced correlations suitable also for more well-graded sands are proposed in the paper. The possible error of a HCA model prediction with parameters fully or partly determined from the correlations is discussed.
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影响因子:
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作者:
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通讯作者:
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