(1. 燕山大學(xué) 先進(jìn)鍛壓成形技術(shù)與科學(xué)教育部重點(diǎn)實(shí)驗(yàn)室，秦皇島 066004；
2. 燕山大學(xué) 河北省特種運(yùn)載裝備重點(diǎn)實(shí)驗(yàn)室，秦皇島 066004)
摘 要: 韌性斷裂準(zhǔn)則依據(jù)金屬材料的微觀斷裂機(jī)理建立宏觀力學(xué)判定模型，對(duì)于應(yīng)用越來越廣、斷裂前無明顯頸縮現(xiàn)象的輕質(zhì)合金板材的斷裂性能分析有重要價(jià)值。隨著對(duì)不同應(yīng)力狀態(tài)條件下斷裂情況的研究，人們對(duì)斷裂微觀機(jī)理和宏觀影響因素有了新的認(rèn)識(shí)，并在此基礎(chǔ)上賦予韌性斷裂準(zhǔn)則新的發(fā)展。本文介紹韌性斷裂準(zhǔn)則的發(fā)展歷程，歸納總結(jié)新型韌性斷裂準(zhǔn)則的特點(diǎn)和優(yōu)勢(shì)，整理準(zhǔn)則中斷裂參數(shù)的標(biāo)定方法，梳理準(zhǔn)則在板材成形中的兩種重要應(yīng)用途徑 —— 斷裂成形極限圖和斷裂軌跡。
關(guān)鍵字: 韌性斷裂準(zhǔn)則；斷裂成形極限圖；斷裂軌跡；輕合金板材
（1. Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education, Yanshan University, Qinhuangdao 066004, China;
2. Hebei Key Laboratory of Special Delivery Equipment, Yanshan University, Qinhuangdao 066004, China）
Abstract:Ductile fracture criterion is a macroscopic mechanics critical model established based on the microscopic fracture mechanism of metal materials. It has great value to the fracture analysis of the increasingly used light alloy sheet which has negligible necking before fracture. With the development of investigation to ductile fracture under different stress states, people have a new understanding on the microcosmic mechanism and macroscopic influencing factors of fracture. Based on the new cognition, ductile fracture criterion gets a new development. In this work, the development history of ductile fracture criterion is introduced and the characteristics and advantages of the new ductile fracture criterion are summarized. Simultaneously, the calculation methods of ductile fracture parameters in new criteria are also reported as well as the fracture forming limit diagram and fracture locus which are the two most important applications of ductile fracture criterion in the analysis of sheet metal forming process.
Key words: ductile fracture criterion; fracture forming limit diagram; fracture locus; light alloy sheet
