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首页> 外文会议>Proceedings of the 2nd international symposium on impact engineering >DYNAMIC MECHANICAL BEHAVIOUR OF LARGE CONCRETE SPECIMENS BY MEANS OF A HOPKINSON BAR BUNDLE
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DYNAMIC MECHANICAL BEHAVIOUR OF LARGE CONCRETE SPECIMENS BY MEANS OF A HOPKINSON BAR BUNDLE

机译：霍普金森棒束的作用下大混凝土试样的动力力学行为

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摘要

The Split Hopkinson Bar (SHB) technique is a good tool to understand the high strain rate mechanical behaviour of materials. One of the compromises of this technique is that the bar length to the diameter ratio must be large. For heterogeneous materials as concrete the specimen should be large enough to be representative of the material. However, the large diameter of the bars introduces a non negligible radial oscillations when the wave propagates along the bars. An other difficulty is to obtain an accurate softening part of the stress strain curve because of the difficulty to estimate the true resisting section when the material is already damaged. In order to avoid these problems a new technique is proposed for the use of the SHB technique on large specimens [1]. The idea is to subdivide both the incident and the transmitter bars in two bundles of 25 elementary bars. Each pair of symmetrical bars measures the incident, reflected and transmitted pulses corresponding to the facing portion of the concrete specimen cross-section. The tests are performed in tension on the Large Dynamic Testing Facility of the Joint Research Centre of Ispra. The signals obtained on each small bar allow then to obtain the local stress strain curve at the cross section. In this study the scale effects is also evaluated by testing cubic specimen with different sizes.
机译：Split Hopkinson Bar（SHB）技术是了解材料的高应变速率机械性能的好工具。该技术的折衷之一是杆的长度与直径之比必须较大。对于异质材料作为混凝土，试样应足够大以代表材料。但是，当波沿棒传播时，棒的大直径会引起不可忽略的径向振荡。另一个困难是获得应力应变曲线的准确的软化部分，这是因为在材料已经损坏时难以估计真正的抵抗力。为了避免这些问题，提出了一种新技术，可将SHB技术用于大样本[1]。想法是将入射和发射器杆细分为两束，每束25个基本杆。每对对称条测量对应于混凝土试样横截面相对部分的入射，反射和透射脉冲。测试是在Ispra联合研究中心的大型动态测试设备上进行的。然后，在每个小条上获得的信号允许获得横截面的局部应力应变曲线。在这项研究中，还通过测试不同尺寸的立方试样来评估尺度效应。

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  • 来源
  • 会议地点 Beijing(CN);Beijing(CN)
  • 作者

    Carlo Albertini; Ezio Cadoni; Kamel Labibes;

  • 作者单位

    European Commission, Joint Research Centre, Institute for Systems, Informatics and Safety T.P.480 - Ispra. 21020 (Va) Italy;

    European Commission, Joint Research Centre, Institute for Systems, Informatics and Safety T.P.480 - Ispra. 21020 (Va) Italy;

    European Commission, Joint Research Centre, Institute for Systems, Informatics and Safety T.P.480 - Ispra. 21020 (Va) Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械动力学;挤压;
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