80 纤维取向为设置的方向，20 为随机。利用Koch曲线模拟非织造纤维网。-we simulated various kinds of nonwovens through programming with Visual basic,in which 80 fibers are oreintation,20 are random.

根据粒径尺寸和数量生成随机骨料，添加钢纤维及聚丙烯纤维(Generate random aggregate)