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非均质材料的细观力学行为研究 史平安1 (1.中国工程物理研究院,结构力学研究所,四川,绵阳,621900) 摘要:为了较好地模拟非均质材料的细观损伤行为,利用含夹杂与裂尖的解析胞元法建立考虑温度效应的复合材料内部裂尖邻域的细观力学模型,利用该模型分析非均质材料中初始缺陷对材料力学性能的影响.研究结果表明,建立的解析胞元法不仅能够比较精确地模拟非均匀材料细观几何结构特征对宏观性能的影响,还能够预测温度场变化引起的裂纹扩展. 关键词:非均质材料; 解析胞元; 细观力学; heterogeneous materials; analytical cell; micromechanics; [全文内容正在添加中] ......
. The main nucleation mechanism of DRX in the present alloy is grain boundary bowing nucleation and the other nucleation mechanism is twin superposition nucleation. The DRX modeling of this alloy is established by means of mathematic fitting data based on true stress-true strain curves. Key words: GH4742 superalloy; dynamical recrystallization; hot compression; nucleation mechanism GH4742 合金是我国首次仿制俄罗斯......
conditions, the nucleation mechanism of dynamic recrystallization including twin induced nucleation, discontinuous nucleation, the second phase particle stimulated nucleation of DRX, and so on, can be found. Key words: magnesium alloy; hot compression; dynamic recrystallization; nucleation mechanism 镁及其合金优点很多,如低密度,高比强度,高比刚度,高比弹性模量,良好的减震和切削加工性,优异的电磁屏蔽性能等[1-2].但目前有关镁合金的研究,发展和应用还存在较大局限,这种局限主要是由于镁合金的室温塑性变形能力......
On the heterogeneous microstructure development in the welded joint of 12MnNiVR pressure vessel steel subjected to high heat input electrogas weldingYang Shen1,Ju Leng1,Cong Wang1,21. School... have been systematically investigated. It is revealed that the welded joint is featured by a heterogeneous juxtaposition. The coarse grained heat-affected zone(CGHAZ) primarily consists of lath......
Purification and enzymatic properties of arsenic resistance protein ArsH from heterogeneous expression in E.coli BL21 WU Xue-ling(吴学玲)1, 2, MIAO Bo(苗 博) 1, 2, HAN Jian(韩 剑) 1, 2, HU Qi(胡 琪) 1, 2, ZENG Jia(曾 嘉) 1, 2, LIU Yuan-dong(刘元东) 1, 2, QIU Guan-zhou(邱冠周)1, 2 1. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China; 2. Key Laboratory......
in the flotation of copper-nickel sulfide ore was studied by correlation analyzing. The results show that slurry shear stress produced by conditioning can reduce the heterogeneous coacervation between serpentine... blades and tilting blades type agitators to optimize the shear stress and axial velocity. Key words: mixing conditioning; floatation; copper-nickel sulfide ore; heterogeneous coacervation; CFD 搅拌调浆是矿石浮选......
regions remain. The homogeneous core is better developed by the injection of the joint water and CO2 WAG than the heterogeneous and fractured cases. Key words: heterogeneous reservoir; enhancing oil...-permeability (or initially bypassed) region (in heterogeneous or fractured reservoirs)? Can it really extract the majority of oil therein? Based only on the aforementioned parameter optimization......
A, 2004, 387: 203-208 [21] 宋维锡. 金属学[M]. 北京: 冶金工业出版社, 2010: 186-203. SONG Wei-xi. Metal science[M]. Beijing: Metallurgical Industry Press, 2010: 186-203. Dynamic recrystallization kinetics and nucleation.... Predicted rules by proposed model show a good agreement with microstructure analysis results. Dynamic recrystallization nucleation mechanisms are constituted of grain boundaries bulging nucleation......
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. Results show that the coercivity for magnets prepared by the combination of strip-casting with hydrogen decrepitation techniques is controlled by the nucleation mechanism. Key words:metal materials; NdFeB magnet; strip casting; hydrogen decreipitation; nucleation mechanism; rare earths; [全文内容正在添加中] ......