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Novel Technique for Static and Dynamic Shear Testing of Ti6Al4V Sheet

机译：Ti6Al4V板材静态和动态剪切测试的新技术

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摘要

Few shear test techniques exist that cover the range of strain rates from static to dynamic. In this work, a novel specimen geometry is presented that can be used for the characterisation of the shear behaviour of sheet metals over a wide range of strain rates using traditional tensile test devices. The main objectives during the development of the shear specimen have been 1) obtaining a homogeneous stress state with low stress triaxiality in the zone of the specimen subjected to shear and 2) appropriateness for dynamic testing. Additionally, avoiding premature specimen failure due to edge effects was aimed at. Most dimensional and practical constraints arose from the dynamic test in which the specimen is loaded by mechanical waves in a split Hopkinson tensile bar device. Design of the specimen geometry is based on finite element simulations using ABAQUS/Explicit. The behaviour of the specimen is compared with the more commonly used simple shear specimen with clamped grips. Advantages of the new technique are shown. The technique is applied to Ti6Al4V sheet. During the high strain rate experiments high speed photography and digital image correlation are used to obtain the local shear strain in the specimen. Comparison of experimental and numerical results shows good correspondence.
机译：很少有剪切测试技术可以涵盖从静态到动态应变率的范围。在这项工作中，提出了一种新颖的试样几何形状，可用于使用传统的拉伸测试设备在宽应变率范围内表征钣金的剪切行为。剪切试样开发过程中的主要目标是1）在受剪切的试样区域中获得具有低应力三轴性的均匀应力状态，以及2）适用于动态测试。另外，旨在避免由于边缘效应而导致样品过早失效。大多数尺寸和实际限制是由动态测试引起的，在动态测试中，样品是通过机械波加载在分体式Hopkinson拉伸杆装置中的。样品几何形状的设计基于使用ABAQUS / Explicit进行的有限元模拟。将样品的性能与更常用的带有夹紧夹具的简单剪切样品进行比较。显示了新技术的优势。该技术适用于Ti6Al4V板材。在高应变率实验中，使用高速摄影和数字图像相关技术来获得样本中的局部剪切应变。实验结果与数值结果的比较显示出良好的对应关系。

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