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State-of-the-art: intermediate and high strain rate testing of solid wood

机译：最新技术：实木的中高应变率测试

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The following state-of-the-art report summarizes important work done in wood science concerning intermediate and high strain rate testing. Intermediate testing may be done with hydraulic machines, which are generally classified as rapid loading. Intermediate testing may also be done using a transverse impact of a beam specimen with a pendulum, drop mass, or toughness tester, whereas high strain rate testing is generally done with the Kolsky bar. The article analyzes the different experimental testing apparatuses, the conclusions past researchers have made about them, and the toughness and strength measurements which were usually done. The transverse impact test is examined in detail because of its adjustability for specimen sizes. The value of this research is it delves into certain impact mechanics principles which are missing from the analysis of impact testing in wood science, which must be included to validate previously held assumptions. The physical response of wood to a dynamic load is not any different from other materials such as metals or rigid foams and is governed by the same principles. Nevertheless, over the years the application of impact mechanics principles to wood testing has been scarce and "black box" experimental, where empirical approaches such as the duration-of-load were often preferred. An example of these principles is the influence of higher modes of vibration plays a greater role on the stress state in testing than its influence on deflections. This principle has been thoroughly investigated for small strain rate vibrations, however, not applied to impact testing. Presently, there is no consensus on a constitutive strain rate model for wood under intermediate and high strain rates. This article provides direction for obtaining dynamic Young's modulus and yield strength, which can be normally expected in the design of structures subjected to dynamical loadings, for the future creation of applicable constitutive strain rate models.
机译：以下最新报告总结了木材科学领域有关中高应变速率测试的重要工作。可以使用液压机进行中间测试，通常将其分类为快速加载。中间测试也可以使用横梁试样的横向冲击力，摆锤，跌落质量或韧性测试仪来完成，而高应变率测试通常使用Kolsky棒进行。本文分析了不同的实验测试设备，过去研究人员对它们的结论以及通常进行的韧性和强度测量。由于其对样品尺寸的可调节性，因此详细检查了横向冲击试验。这项研究的价值在于，它探究了某些冲击力学原理，这些原理是木材科学中的冲击测试分析所缺少的，必须将这些原理包括在内以验证先前持有的假设。木材对动态载荷的物理响应与其他材料（如金属或硬质泡沫）没有任何不同，并且受相同原理支配。然而，多年来，冲击力学原理在木材测试中的应用一直很少，并且是“黑匣子”实验，在该实验中，通常首选经验方法，例如负载持续时间。这些原理的一个例子是，较高的振型对测试应力状态的影响要大于对变形的影响。对于小应变速率振动，已经对该原理进行了彻底研究，但是，该原理尚未应用于冲击测试。目前，在中等和高应变速率下，木材的本构应变速率模型尚无共识。本文为获得动态杨氏模量和屈服强度提供了方向，这在动态载荷结构设计中通常可以期望得到，以用于将来创建适用的本构应变率模型。

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  • 来源
    《Wood Science and Technology》 |2017年第6期|1479-1534|共56页
  • 作者

    Polocoser Tiberiu; Kasal Bohumil; Stoeckel Frank;

  • 作者单位

    Tech Univ Carolo Wilhelmina Braunschweig, Dept Civil & Environm Engn, D-38102 Braunschweig, Germany;

    Tech Univ Carolo Wilhelmina Braunschweig, Dept Civil & Environm Engn, Chair Organ & Wood Based Mat, D-38102 Braunschweig, Germany|Tech Univ Carolo Wilhelmina Braunschweig, Fraunhofer Wilhelm Klauditz Inst, D-38102 Braunschweig, Germany;

    Tech Univ Carolo Wilhelmina Braunschweig, Dept Civil & Environm Engn, D-38102 Braunschweig, Germany;

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