布管法双向自增强管材连续扩胀装置的实验研究

采用布管法连续扩胀装置加工了聚氯乙烯（PVC）环向扩胀管和双向自增强管。实验结果表明，直径从40 mm扩胀到50 mm的环向扩胀管的环向拉伸强度提高了23 %～25 %，环向弹性模量提高了12 %。双向自增强PVC管的环向拉伸强度提高了26 %～33 %，弹性模量提高了30 %～33 %。通过对不同轴向拉伸比的双向自增强管的拉伸强度比较发现，随着轴向拉伸比的增加，环向拉伸强度逐渐提高。，环向弹性模量提高12%。双向自增强PVC管的拉伸强度提高了26%-33%，弹性模量提高了30%-33%。通过对不同轴向拉伸比双向自增强管的拉伸强度比较发现，随着轴向拉伸比的增加，环向拉伸强度逐渐提高。

Experimental Study on Continuous Expansion Equipment for Biaxial Self-reinforcement Pipes with A Cloth Bag

Hoop expanded PVC pipe and biaxial self-reinforcement PVC pipe were produced with a continuous expansion equipment with cloth bag. When the diameter of the pipe was expanded from Ф40 mm to Ф50 mm ，the hoop tensile strength increased 23 % ～25 %, the hoop young's modulus increased 12 %. Through biaxial self-reinforcement, the hoop tensile strength of the pipe increased 26 % ～33 %, hoop young's modulus increased 30 %～33 %. For the biaxial self-reinforcement pipe, the hoop tensile strength increased with increasing axial stretching ratio.