Physical experiment and numerical simulation combined method for predicting metal extrusion forming cracking

• Main Authors: MAO XIAONAN, LUO YUANYUAN, ZHANG JINGLI, ZHAO BIN, WU JINPING, YANG FAN, GUO DIZI, ZHAO SHENGZE
• Format: Patent
• Language: Chinese; English
• Published: 30.11.2018
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention discloses a physical experiment and numerical simulation combined method for predicting metal extrusion forming cracking. The method comprises the steps that first, a hot-stretch test isperformed on metal, and then a Normalized Cockcroft&Latham damage model is selected for calculation to obtain a critical damage value of the metal; second, simulated verification is performed on thecritical damage value of the metal; and third, the critical damage value of the metal after simulated verification is embedded into a metal extrusion finite element model, and the cracking phenomenonin the metal extrusion forming process is predicted. According to the method, a physical experiment and simulated verification are combined to acquire the reliable critical damage value of the metal,then the positions and shapes of metal surface and internal cracks generated in multiple extrusion forming processes are predicted through numerical simulation of the extrusion processes, an error caused by a test mistake is avo