The analytical results show that porosity, void ratio, increment of porosity, increment of void ratio, rate of porosity and rate of void ratio are non-homogeneous in shear band.

结果表明，剪胀后的孔隙度、孔隙比、孔隙度增量、孔隙比增量、孔隙度变化率及孔隙比变化率均具有局部化特征，在剪切带中部其值最大。

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The analytical solutions of maximum void ratio, average value of increment of maximum void ratio, average value of maximum void ratio and average value of maximum porosity were derived.

建立了剪切带内部的最大孔隙比、平均最大孔隙比增量、平均最大孔隙比及平均最大孔隙度的解析式。

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Microporous polypropylene membrane has many desirable properties including high void volumes, well-controlled porosity, chemical intertness and low cost.

聚丙烯微孔膜具有价格低廉、化学和热稳定性好、机械强度高、无毒、孔隙率容易控制等优点。

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