(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 中南大學(xué) 信息科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 鎢基合金喂料在擠壓過(guò)程中具有坯料非連續(xù)性、力學(xué)性能不確定的特點(diǎn)，采用金屬類(lèi)屈服準(zhǔn)則來(lái)表征鎢基合金喂料強(qiáng)度已不適應(yīng)。采用線性Drucker-Prager準(zhǔn)則(D-P準(zhǔn)則)，通過(guò)變角剪切試驗(yàn)測(cè)定鎢基合金喂料的摩擦角和粘聚力，在MSC.Marc中實(shí)現(xiàn)了對(duì)鎢基合金喂料正擠壓的有限元模擬。結(jié)果表明：采用線性D-P準(zhǔn)則能更好地描述擠壓過(guò)程中喂料的強(qiáng)度變化及受力過(guò)程；基本擠壓階段實(shí)際擠壓力為137 kN，與通過(guò)模擬積分得到擠壓力146 kN的相對(duì)誤差為6.5%，說(shuō)明所建立模型對(duì)鎢基合金喂料增塑擠壓成形具有較好的適應(yīng)性。
關(guān)鍵字: 鎢合金；擠壓成形；數(shù)值模擬；Drucker-Prager準(zhǔn)則
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Information Science and Engineering, Central South University, Changsha 410083, China）
Abstract:It is not accurate to characterize the feed intensity of the tungsten-based alloys using the metal yield criterion, due to the discontinuity of feed and the uncertainty CRITERION of mechanical properties during the process of extrusion. Based on the linear Drucker-Prager criterion，the extrusion process of the tungsten-based alloys feed was simulated utilizing the finite element analysis software of MSC.Marc. The friction angle and cohesion of the feed were measured by the variable angle shearing test. The results show that the change of the feed intensity and the force during extrusion can be described more specific by applying the linear D-P criterion. The actual extruding force is 137 kN, whereas the simulating extruding force is 146 kN. The relative error is only 6.5%，indicating that the mold based on the D-P criterion is adapted well to the feed extrusion of the tungsten-based alloys.
Key words: tungsten alloy; extrusion molding; numerical simulation; Drucker-Prager criterion
