Low Cyclic Fatigue of HG70-steel Mining Dump Truck Frame Under Low-Temperature: Chaboche Model and Finite Element Analysis

Abstract

This paper investigates the low cyclic fatigue behavior of a heavy-duty mining dump truck frame manufactured of HG70-steel under low-temperature conditions. The Chaboche cyclic plastic constitutive model is adopted to characterize the viscoplastic properties of the steel. A finite element model of the frame is subsequently implemented to investigate its structural strength and low cycle performance, integrating the intrinsic stress-strain hysteresis loop. The study reveals the softening stages of HG70-steel under low-temperature low cycle fatigue testing conditions, and investigates the stress concentration regions and maximum displacements in the structured frame. The coded in-house program can be used to assess the low cycle fatigue behavior of steels and components, providing valuable insights into the design and safety analysis of heavy-duty mining dump trucks.