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国家自然科学基金(10121202)

作品数:17 被引量:70H指数:5
相关作者:黄永刚黄克智秦江林立马明更多>>
相关机构:清华大学伊利诺伊大学中国科学院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家教育部博士点基金更多>>
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17 条 记 录,以下是 1-10
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铁电单晶的电致裂纹扩展
本文利用实验和理论方法对铁电单晶的电致裂纹扩展进行了系统研究。利用偏光显微镜对含单边裂纹的极化PMN-PT62/38单晶的裂纹扩展以及裂尖畴变行为进行了在位观测,发现相比正电场,负电场能引起更大的畴变区,小于矫顽场幅值的...
方岱宁蒋叶剑张一慧刘彬
关键词:铁电材料力电耦合
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采用特征线方法对混合硬化情况下基于变形机制的应变梯度工程塑性理论的研究被引量:4
2009年
应变梯度工程塑性(简称CMSG)理论是一种低阶应变梯度塑性理论。它保持了经典塑性理论的基本结构,不需要非经典的附加边界条件,因此容易应用于数值分析。该文建立了在混合硬化情况下CMSG理论的本构关系,并采用非线性偏微分方程中的特征线方法研究其适定性。对于无限长固体层承受剪切的问题,确定了在不同的混合硬化情况下CMSG理论的"定解域"。在"定解域"内特征线方法的解与混合差分方法的解吻合得很好,但在"定解域"之外解有可能不唯一,因此需要非经典的附加边界条件才能使其解成为适定。随着外加剪切应力的增加,"定解域"逐渐收缩并最终消失。
秦江黄克智黄永刚
关键词:应变梯度
Coalescence of pore columns by domain switching被引量:1
2006年
The present paper studies the coalescence of pore columns in ferroelectric ceramics driven by back and forth domain switching under cyclic electric field. A finite element method that incorporates mass transfer capacity is formulated to simulate the evolution of point defects subjected to the kinetics of pore surface diffusion and domain wall migration. The merge of point defects provides a mechanism for the vacancy agglomeration that leads to the formation of large pores or microcracks.
Liming Geng Wei Yang
关键词:FERROELECTRICSCOALESCENCE
碳纳米管超薄柱壳模型的尺度效应
研究了单壁碳纳米管作为超薄柱壳模型的广泛适用性和尺度效应,包括厚度、弹性对称性和弹性模量的尺度相关性.表明只有直径大于1 nm的单壁管,可以用常厚度、常弹性模量的各向同性超薄壳模型.对于多壁管,由于管间距离也依赖于直径,...
王立峰郑泉水刘哲蒋庆
关键词:碳纳米管
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亲水基底上的超疏水现象
固体的表面微结构对于制造超疏水表面起到至关重要的作用。本文从几何和能量的角度研究了粗糙基底上的Cassie-Baxter和Wenzel模型。结果表明,如果液滴下面微结构中的空气与外界连通,则对于具有正弦形状微结构的基底,...
刘建林冯西桥
关键词:超疏水微结构
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MAGNETOMECHANICAL BEHAVIORS OF GIANT MAGNETOSTRICTIVE MATERIALS被引量:1
2008年
The Laves phase alloy Tb-Dy-Fe, commercially known as Terfenol-D, exhibits the giant room-temperature magnetostriction at moderate field strength of a few kOe due to its combination of high magnetostriction and low magnetocrystalline anisotropic energy. Thus, this pseudobinary rare earth iron compound has found quite a number of applications such as in magnetomechanical transducers, actuators and adaptive vibration control systems. The simultaneous measurements of magnetostriction and magnetization at various fixed compressive pre-stresses applied in the axial direction for Tb0.3Dy0.7Fe1.95 samples are presented. The results show that the magnetostriction increases with increasing compressive stress until it reaches 1742 ×10^6 under 25 MPa, so does the coercive magnetic field. And the hysteresis loop area for magnetization and magnetostriction also increases with the increment of applied compressive stresses. But the maximum magnetic susceptibility χ(dM/dH) is obtained under zero stress field and the strain derivative dλ/dH increases to the highest amplitude of 0.039×10^-6 A^-1m at a stress level of 5 MPa. In the strain versus magnetization intensity curve, the initial fiat stage mainly consisting of a 180° domain wall motion becomes shorter with increasing stress. It means more initial domains are driven to the transversal direction under the compressive stress before magnetization, which is consistent with the improvement of the magnetostriction.
Xu GaoYongmao PeiDaining Fang
关键词:MAGNETIZATIONMAGNETOSTRICTION
Study of electric-field-induced crack growth in ferroelectric single crystal
<正>The crack growth in PMNT62/38 ferroelectric single crystal subjected to an electric field was in situ obser...
Ye-jiang Jiang
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Mechanical properties of cocoons constructed consecutively by a single silkworm caterpillar,Bombyx mori被引量:3
2008年
Most animals have the ability to adapt, to some extends and in different ways, the variation or disturbance of environment. In our experiments, we forced a silkworm caterpillar to spin two, three or four thin cocoons by taking it out from the cocoon being constructed. The mechanical properties of these cocoons were studied by static tensile tests and dynamic mechanical thermal analysis. Though external disturbances may cause the decrease in the total weight of silk spun by the silkworm, a gradual enhancement was interestingly found in the mechanical properties of these thin cocoons. Scanning electron microscopy observations of the fractured specimens of the cocoons showed that there exist several different energy dissipation mechanisms occurred simultaneously at macro-, meso-, and micro-scales, yielding a superior capacity of cocoons to adsorb the energy of possible attacks from the outside and to protect efficiently its pupa against damage. Through evolution of millions of years, therefore, the silkworm Bombyx mori seems to have gained the ability to adapt external disturbances and to redesign a new cocoon with optimized protective function when its first cocoon has been damaged for some reasons.
S.Q.HuangH.P.ZhaoX.Q.FengW.CuiZ.LinM.Q.Xu
关键词:SILK
The indenter tip radius effect in micro- and nanoindentation hardness experiments被引量:5
2006年
Nix and Gao established an important relation between the microindentation hardness and indentation depth. Such a relation has been verified by many microindentation experiments (indentation depths in the micrometer range), but it does not always hold in nanoindentation experiments (indentation depths approaching the nanometer range). Indenter tip radius effect has been proposed by Qu et al. and others as possibly the main factor that causes the deviation from Nix and Gao's relationship. We have developed an indentation model for micro- and nanoindentation, which accounts for two indenter shapes, a sharp, conical indenter and a conical indenter with a spherical tip. The analysis is based on the conventional theory of mechanism-based strain gradient plasticity established from the Taylor dislocation model to account for the effect of geometrically necessary dislocations. The comparison between numerical result and Feng and Nix's experimental data shows that the indenter tip radius effect indeed causes the deviation from Nix-Gao relation, but it seems not be the main factor.
Fan ZhangYonggang HuangKeh-Chih Hwang
从苍蝇与物面的触粘看尺度效应被引量:3
2004年
苍蝇与光滑硬物体接触时,靠腿上纤毛与物体表面产生吸附作用,在JKR接触理论下,得出考虑表面能作用时的粘附力表达式,结果表明苍蝇与物面的触粘和脱离界定了其纤毛的尺度范围,该尺度范围与扫描电镜观察的结果相一致。
杨帆杨卫
关键词:苍蝇纤毛表面能能量释放率仿生学
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