泡沫材料

Voronoi models developed in this paper can be applied with the periodic boundary conditions, which is the key for the micromechanics analysis.

结合有限元分析的细观多孔模型被应用到泡沫材料力学行为的研究中，主要包括：弹性开孔泡沫材料的本构行为；弹塑性开孔泡沫材料的多轴行为和唯象模型；开孔泡沫材料率相关行为。

And give a close study of the smolder ing velocities of polyurethane foam under different heat fluxes.

分析对比了相同加热条件下的聚氨酯泡沫材料在有氧和无氧气氛下的升温过程，并对不同加热条件下的聚氨酯泡沫材料的阴燃传播速度进行研究。

The results show that the deformation characteristics of syntactic foams are very similar to those of plain foams during compression. The syntactic foam is yielded when the strain reaches about 2% and it is collapsed when the strain is larger than 30%.

结果表明，复合泡沫材料在压缩过程中，具有普通泡沫材料的应力-应变曲线的典型特征，在应变为2%左右时材料发生屈服，在应变大于30%后发生破坏。

Based on this model, two formulas for estimating the equivalent stretching and compressive Young＇s modulus are derived.

此外，本文通过泡沫材料的单向拉伸、压缩试验，完成了泡沫材料拉压双模量效应的试验验证。

In terms of gap test s of TNT and JH-2, they were approximatively achieved that were gap distances on the conditions of air and polyurethane foam by qualitative analysis, and conclusion was that copper liner effects on gap distance when applied conditi.

在简要总结聚氨酯泡沫材料隔爆性能的基础上，介绍了硬质聚氨酯泡沫材料对冲击波的衰减规律。

The carbon foam were prepared by self-bubbling at high pressure from AR pitch added sodium dodecyl benzene sulfonate and Span-40, respectively. The bulk density, pore rate, compressive strength, thermal conductivity at room temperature and crystallitic parameters of carbon foam were measured. The rheological properties of AR pitch and pore structure of carbon foam were investigated.

以十二烷基苯磺酸钠和Span-40表面活性剂为添加剂，AR沥青为原料，制备炭素泡沫材料，测定了材料的体积密度、显气孔率、压缩强度、常温热导率以及微晶结构参数，研究了添加表面活性剂后AR沥青的流变性能和炭素泡沫材料孔胞结构的变化。

On the basis of the ligamental reticulated carbon foam by Klett J W in 2000 and hollow microsphere carbon foam by Bruneton E in 2002, a hollow microsphere/ reticulated composite carbon foam was prepared by microstructural optimization, carbonization and graphitization respectively.

在Klett J W等人于2000年制备的韧带网络型碳泡沫和Bruneten E等人在2002年制备了一种空心微球碳泡沫材料结构的基础上，分别经过微观结构优化、碳化、石墨化处理，制备出了一种空心微球/网络复合型碳泡沫材料。

As a special form of polymer, the perdeuterated polymer foams not only have the microporours structure and good capabilities as same as nondeuterated polymer foams, but have some particular characters, such as isotope effect, nonradioactivity, and high deuterated ratio. For those reasons, the perdeuterated polymer foams will be used in many fields, especially in inertial confinement fusion and low wastage plastic.

全氘代聚合物泡沫作为一类特种聚合物材料，不仅具有常规聚合物泡沫材料所具有的微孔形貌和良好的物理化学、机械力学等性能，而且还具有独特的同位素效应，以及非常高的氘代率等特征，且无放射性，因而在激光惯性约束聚变(Initial Confinement Fusion，ICF)热核靶材料，以及低损耗塑料光纤材料等研究领域中具有十分广泛的应用前景。

As a special form of polymer, the perdeuterated polymer foams not only have the microporours structure and good capabilities as same as nondeuterated polymer foams, but have some particular characters, such as isotope effect, nonradioactivity, and high deuterated ratio.

摘要全氘代聚合物泡沫作为一类特种聚合物材料，不仅具有常规聚合物泡沫材料所具有的微孔形貌和良好的物理化学、机械力学等性能，而且还具有独特的同位素效应，以及非常高的氘代率等特征，且无放射性，因而在激光惯性约束聚变(Initial Confinement Fusion，ICF)热核靶材料，以及低损耗塑料光纤材料等研究领域中具有十分广泛的应用前景。

The relation between the relative Young′s modulus of the models and the anisotropic size ratio was obtained and compared with theory pred...

结果表明，建立的开孔和闭孔随机泡沫模型能较好地反映泡沫材料的各向异性力学性质；且开孔和闭孔泡沫的各向异性力学性能均与泡沫材料的相对密度有关。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。