The results show that, with an increasing internal pressure, non-circularity of the tube decreases, and the tendency of thickness thinning on inner and out side of the tube increases.

结果表明，随着充液压力的增大，截面不圆度逐渐减小，管材内侧壁厚增厚趋势减小，外侧减薄趋势增大。

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The results show that, with an increasing internal pressure, non-circularity of the tube decreases, and the tendency of thickness thinning on inner and out side of the tube increases.

结果表明，随着充液压力的增大，截面不圆度逐渐减小，管材内侧壁厚增厚趋势减小，外侧减薄趋势增大。

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