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Strength of polyethylene gas distribution pipes under cyclic loading (effect of notch and crack on gas distribution pipes)

机译：循环载荷下聚乙烯气体分配管的强度（气体分配管槽口裂缝的影响）

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The strength of polyethlene (PE) gas distribution pipes are examined under cyclic loading. A specimen is cut out from medium-density PE pipes for gas distribution. Experiments are conducted on fatigue strength of PE pipe specimens with V-shapednotch and also with circular crack. The fatigue strength of V-notched specimens are equivalent in the range of stress concentration from 2.5 to 6.7 approximately. Also in circular-cracked specimens, it is shown that the fatigue strength does not change in the range of crack depth from 1.5 mm to 2.5 mm, and it depends on the depth of crack if the crack grows or not, and then the relationship between stress amplitude and crack depth is devided into three regions as A, B and C.
机译：在环状载荷下检查聚乙烯（PE）气体分配管的强度。 从中密度PE管中切出样品以进行气体分布。 对V形型管道和圆形裂纹的PE管样品疲劳强度进行实验。 V型缺口样品的疲劳强度在应力浓度范围内相当于2.5至6.7的范围。 同样在圆形破裂的标本中，表明疲劳强度不会在裂缝深度范围内从1.5mm到2.5mm的范围内变化，并且如果裂缝长大或者之间的关系，则取决于裂缝深度，然后 应力幅度和裂纹深度将三个区域分为A，B和C.

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