In the modelling of machining operations, constitutive models must consider the material behavior subject to high plastic strains, high strain rates, high temperatures and high heating rates. A new material model for AISI 1045, which captures time-dependent plastic response associated with interrupted austenite transformation under short (sub-second) heating times, is deployed to simulate orthogonal cutting experiments. High speed video and digital image correlation measurements are used to capture chip behavior. The new model, which also includes complex strain hardening and dynamic strain aging effects, show better agreement with experiments at high cutting speeds compared with a basic Johnson-Cook material model from the literature.

在加工操作建模中，本构模型必须考虑高塑性应变、高应变率、高温和高加热速率下的材料行为。 AISI 1045 的新材料模型可捕获与短（亚秒）加热时间下中断的奥氏体转变相关的时间依赖性塑性响应，用于模拟正交切削实验。高速视频和数字图像相关测量用于捕获芯片行为。与文献中的基本 Johnson-Cook 材料模型相比，新模型还包括复杂的应变硬化和动态应变时效效应，与高切削速度下的实验表现出更好的一致性。