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| 1 | 铝合金疲劳裂纹扩展过程中夹杂物影响的量化分析显示文摘本研究测量了Al 7075—T651铝合金的疲劳裂纹扩展率和中间△K疲劳载荷区间的疲劳条纹间距,对材料微观结构在疲劳裂纹扩展中的作用进行了量化分析,建立了剪切断裂机制和夹杂物断裂—韧窝形成机制引起裂纹扩展的实验方程。研究还发现了K_(max,o)和K'c两个转折点,低于K_(max,o),裂纹仅由剪切断裂机制引起;高于K'c,裂纹由夹杂物断裂—韧窝形成机制主导,在K_(max,o)和K'c之间,疲劳裂纹扩展由上述两者共同组成。 | 徐建国 H.W.Liu | 1993 | 浙江大学学报(自然科学版)1993，27，4： | 2 |
| 2 | A STUDY OF EXPERT SYSTEM FOR SECTION EXTRUSION PROCESS BASED ON FINITE ELEMENT METHOD SIMULATION显示文摘The samples obtained by Finite Element Method (FEM) simulation for section extrusion process have been trained on BP Neural Networks. The mapping relationsbetween die’s geometrical parameters and energetic parameters, such as stress and strain generated in the die are established. The extrusion process model and its expert system are also determined. The excellent expansibility this system possesses provides a new prospect for the future development of expert system for section extrusion dies. | H.W.Liu 1) , H.Ding 2) and J.Z.Cui 2) 1) School of Mechanical Engineering, Shenyang University, Shenyang 110044, China 2) School of Materials & Metallurgy, Northeastern University, Shenyang 110006, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 1 |
| 3 | A APPLICATION OF ANSYS ON A SECTION EXTRUSION DIE显示文摘Porthole dies are important tools in extrusion process to produce hollow sections and the life of the dies counts for the cost of products. In this work, the finite element method was adopted to analyze a particular porthole die to produce hollow rectangle sections which are widely used in construction. The upper die was mainly studied. Because it is symmetrical, a quarter of the die was analyzed. The upper die was divided into 2199 elements with 3018 nodes. Elements were produced by four steps and the geometric shape of the die could be well simulated. The boundary condition was given according to the shape of the welding chamber and an empirical average extrusion stress was adopted, which was 210N/mm 2. Three-dimensional equivalent stresses were received. The original porthole die studied had obvious stress concentration and the stress distribution was very inhomogeneous, which would heavily affect the die life. A new design was proposed in which the portholes were rearranged and their shape and dimension were changed. According to the finite element analysis, the stress distribution of the improved die was quite homogeneous and the stress concentration was lessened. | H.W.Liu 1) ,H.Ding 2) and J.Z.Cui 2) 1) School of Mechanical Engineering, Shenyang University, Shenyang 110044, China 2) School of Materials & Metallurgy, Northeastern University, Shenyang 110006, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 1 |
| 4 | Multi-criteria decisionmaking methods based on intuitionistic fuzzy sets显示文摘 | H.W.Liu G.J.Wang | | 0，，01： | 1 |
| 5 | 查看详情显示文摘 | H.W.Liu H.T.Yuan N.Fukui L.Zhang J.F.Jia Y.Iwasa M.W.Chen T.Hashizume T.Sakurai and Q.K.Xue | | 0，，： | 1 |
| 6 | Miniaturised microstrip bandpass filter using octagonal hairpin resonators with side-coupled technique显示文摘 | H.W.Liu W.M.Li | | 0，，24： | 1 |
| 7 | 废水源中污染物的分析鉴定和处理条件对CTMP废水生物降解的影响显示文摘本研究分析鉴定了一家制浆造纸厂内十七种不同来源的废水中所含之污染物。结果显示:CTMP洗浆废水中BOD_5、COD、树脂酸和脂肪酸(二者简称RFA)以及其它污染物成份的含量和负荷都远远高过其它十六种废水。研究结果还表明:pH值、温度低于40℃时和溶解氧的含量对BOD_5和RFA的除去无明显影响,但对COD的除去则产生显著影响。经短时间处理后,这种废水中的BOD_5、RFA和COD分别除去约94%、96%和68%,并且污泥沉降良好。采用两天的处理时间,可以除去几乎98%的BOD_5和RFA以及80%的COD。 | S.N.Lo H.W.Liu H.C.Lavallee | 1991 | 中国造纸1991，10，3： | 0 |
| 8 | HIGH-CURRENT PULSED ELECTRON BEAM: RAPID SURFACE ALLOYING AND WEAR RESISTANCE IMPROVEMENT显示文摘The present paper reports the rapid surface alloying induced by the bombardment of high-current pulsed electron beam. Two kinds of substrate materials were examined to show this effect. The first sample was a pure Al metal pre-coated with fine carbon powders prior to the bombardment, and the second alloy is the D2-Cr12Mo1 V1 mould steel pre-coated with Cr, Ti, and TiN powders. The surface elements diffuse about several micrometers into the substrate materials only after several bombardments.Tribological behaviors of these samples were characterized and significant improvement in wear resistance was found. Finally, a TEM analysis reveals the presence of stress waves generated by coupled thermal and stress fields, which was considered as the main cause of the enhanced properties. | J.Xu H.W.Liu Z.R.Zhou C.Dong A.M.Wu S.Z.Hao A.M.Zhang T.Xu | 2003 | Acta Metallurgica Sinica(English Letters)2003，16，4： | 0 |
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