预应力复合材料及包装袋受力分析樊宁预应力是为了提高某种材料（构件）的强度，在使用前预先施加的永久性内应力。他可以用较少的材料，获得较高的强度，最大限度的提高材料的强度，在各个领域里有着广泛应用，如预应力钢筋混凝土等。预应力复合材料新技术是根据预应力原... Prestressed composite materials and bags force analysis Fanning prestress is to increase the strength of a material (component), before the use of pre-applied permanent stress. He can use less material, obtain higher strength, maximize the strength of the material, has a wide range of applications in various fields, such as prestressed reinforced concrete. Prestressed composite new technology is based on prestress ...