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对三种型号的长条形聚四氟乙烯(PTFE)薄膜连接试件进行了7种搭接宽度(20,30,40,50,60,70,80mm)下的单轴拉伸试验,得到了相应的应力-应变曲线、薄膜破坏形式以及连接强度的变化规律。结果表明,当搭接宽度为20~30mm时,PTFE薄膜试件破坏位置多发生于搭接热合区内或者热合区边缘处;当搭接宽度大于30mm时,薄膜试件破坏位置则发生于母材区域范围内;在搭接宽度为30~40mm时,PTFE薄膜的连接强度基本可以达到母材抗拉强度的80%,在搭接宽度为50~60mm时,PTFE薄膜的连接强度基本可以达到母材抗拉强度。
Uniaxial tensile tests of seven kinds of lap widths (20, 30, 40, 50, 60, 70 and 80 mm) were carried out on the three types of strip Teflon film- The corresponding stress - strain curve, the film damage form and the connection strength variation. The results show that when the overlap width is 20 ~ 30mm, the failure location of the PTFE film mostly occurs in the overlap heat sealing zone or the edge of the heat sealing zone. When the overlap width is larger than 30mm, the damage location of the film specimen occurs in the mother Material area; when the overlap width is 30-40mm, the connection strength of the PTFE film can reach 80% of the tensile strength of the base material basically, and the bonding strength of the PTFE film can be basically achieved when the overlap width is 50-60mm Base metal tensile strength.