A significant number of materials show different mechanical behavior under dynamic loads compared to quasi-static (Salvado et al. in Prog. Mater. Sci. 88:186–231, 2017). Therefore, a comprehensive study of material dynamic behavior is essential for applications in which dynamic loads are dominant (Li et al. in J. Mater. Process. Technol. 255:373–386, 2018). In this work, aluminum 6061-T6, as an example of ductile alloys with numerous applications including in the aerospace industry, has been studied under quasi-static and dynamic tensile tests with strain rates of up to \(156~\mbox{s}^{-1}\). Dogbone specimens were designed, instrumented and tested with a high speed servo-hydraulic load frame, and the results were validated with the literature. It was observed that at a strain rate of \(156~\mbox{s}^{-1}\) the yield and ultimate strength increased by \(31\%\) and \(33\%\) from their quasi-static values, respectively. Moreover, the failure elongation and fracture energy per unit volume also increased by \(18\%\) and \(52\%\), respectively. A Johnson–Cook model was used to capture the behavior of the material at different strain rates, and a modified version of this model was presented to enhance the capabilities of the original model, especially in predicting material properties close to the failure point. Finally, the fracture surfaces of specimens tested under quasi-static and dynamic loads were compared and conclusions about the differences were drawn.

与准静态相比，大量材料在动态载荷下表现出不同的机械性能（Salvado等人，Prog。Mater。Sci。88：186–231，2017）。因此，对于动态载荷占主导地位的应用，对材料动态行为的全面研究至关重要（Li等人，J。Mater。Process。Technol。255：373–386，2018）。在这项工作中，铝6061-T6作为延展性合金的一个例子，在航空航天工业中得到了广泛的应用，已经在准静态和动态拉伸试验下对应变速率高达\（156〜\ mbox {s}的情况进行了研究。 ^ {-1} \）。使用高速伺服液压载荷框架设计，测试和测试狗骨标本，并用文献验证了结果。观察到在应变速率为\（156〜\ mbox {s} ^ {-1} \）的屈服强度和极限强度分别比其准静态值增加了\（31 \％\）和\（33 \％\）。此外，每单位体积的破坏伸长率和断裂能也分别增加了\（18 \％\）和\（52 \％\）。使用Johnson-Cook模型来捕获材料在不同应变率下的行为，并提出了该模型的修改版本以增强原始模型的功能，尤其是在预测接近失效点的材料特性时。最后，比较了在准静态和动态载荷下测试的试样的断裂面，并得出了差异的结论。