温度对PE燃气管热熔焊接接头性能的影响
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摘要
主要研究了聚乙烯(PE)燃气管热熔焊接接头在不同温度下的力学性能,通过不同温度下PE材料的拉伸破坏实验,根据不同温度下PE燃气管道焊接接头拉伸应力及拉伸应变,利用数值拟合的方法建立了PE材料接头的最大应力和断裂伸长率与温度的函数关系。其中卷边的存在容易产生应力集中使管道断裂,无卷边试样断裂伸长率总体高于有卷边试样且温度越高越明显,去除卷边对拉伸强度影响较小,可提高试样的断裂伸长率。温度对PE材料的拉伸强度、断裂伸长率影响较大,温度升高,PE材料的拉伸强度降低,断裂伸长率增加。
The mechanical properties of the hot melt polyethylene(PE) gas pipe welded joints under different temperature mainly were studied,through the tensile fracture experiment of PE materials under different temperature,According to the tensile stress and tensile strain of welded joints of PE gas pipeline at different temperatures, the relationship between maximum stress and elongation at break of PE material and temperature was established by numerical fitting method. The edge was easy to produce stress concentration makes the pipeline rupture, no edge specimen elongation at break general than had edge and the higher the temperature, the more obvious, remove the edge effect on the tensile strength is lesser, can improve the elongation at break. The temperature has great influence on the tensile strength and elongation at break of PE material, temperature increases, tensile strength of PE material decreases, elongation at break increases.
The mechanical properties of the hot melt polyethylene(PE) gas pipe welded joints under different temperature mainly were studied,through the tensile fracture experiment of PE materials under different temperature,According to the tensile stress and tensile strain of welded joints of PE gas pipeline at different temperatures, the relationship between maximum stress and elongation at break of PE material and temperature was established by numerical fitting method. The edge was easy to produce stress concentration makes the pipeline rupture, no edge specimen elongation at break general than had edge and the higher the temperature, the more obvious, remove the edge effect on the tensile strength is lesser, can improve the elongation at break. The temperature has great influence on the tensile strength and elongation at break of PE material, temperature increases, tensile strength of PE material decreases, elongation at break increases.
引文
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[4]林少全,吴春晖.美国塑料管道发展之道[J].国外塑料,2006,9:22–25.Lin Shaoquan,Wu Chunhui.The development of American plastic pipeline[J].Foreign Plastics,2006,9:22–25.
[5]北京塑料工业协会.中国塑料管道市场分析报告——钢增强塑料管道市场前景[J].塑料工业,2011(11):118–147.Beijing Plastics Industry Association.China plastic pipeline market analysis report-market prospect of steel reinforced plastic pipeline[J].Plastics Industry,2011(11):118–147.
[6]郑伟义,陈国龙,陈志刚.塑料焊接技术[M].北京:化学工业出版社,2015.Zheng Weiyi,Chen Guolong,Chen Zhigang.Plastic welding technology[M].Beijing:Chemical Industry Press,2015.
[7]郑津洋,秦永泉,施建峰.聚乙烯管道热熔接头卷边对拉伸性能的影响[J].中国塑料,2009(7):77–80.Zheng Jinyang,Qin Yongquan,Shi Jianfeng.The influence of the edge of a polyethylene pipe hot melt joint on tensile properties[J].China Plastic,2009(7):77–80.
[8]辛明亮,李茂东,张术宽,等.聚乙烯燃气管道失效模式研究进展[J].中国塑料,2015,29(3):16–20.Xin Mingliang,Li Maodong,Zhang Shukuan,et al.Research progress of the failure mode of polyethylene gas pipeline[J].China Plastic,2015,29(3):16–20.
[9]闵文.含工艺缺陷PE管道热熔焊接接头失效机理分析[D].哈尔滨:哈尔滨理工大学,2015.Min Wen.Analysis of failure mechanism of hot-melt welding joints of PE pipeline with process defects[D].Harbin:Harbin Institute of Technology,2015.
[10]黄学斌,伏喜斌,徐火力,等.聚乙烯管道热熔对接焊接头冷拉伸性能研究[J].机械制造文摘–焊接分册,2015(2):1–4.Huang Xuebin,Fu Xibin,Xu Huoli,et al.Research on the cold tensile properties of welding head for thermal fusion of polyethylene pipe[J].Welding Digest of Machinery Manufacturing,2015(2):1–4.
[11]秦永泉.含工艺缺陷聚乙烯管道热熔焊接接头力学性能试验研究[D].杭州:浙江大学,2010.Qin Yongquan.Mechanical properties test of hot melt joints of polyethylene pipe with process defects[D].Hangzhou:Zhejiang University,2010.
[12]罗艺,姜稳庄.聚乙烯燃气管道接口的质量控制[J].城市燃气,2004,11:3–6.Luo Yi,Jiang Wenzhuang.Quality control of polyethylene gas pipeline interface[J].Urban Gas,2004,11:3–6.
[13]周维祥.塑料测试技术[M].北京:化学工业出版社,1999.Zhou Weixiang.Plastic test technology[M].Beijing:Chemical Industry Press,1999.
[14]徐成,徐平,施建峰,等.聚乙烯管韧性破坏寿命预测方法研究[J].压力容器,2012,29(1):1–6.Xu Cheng,Xu Ping,Shi Jianfeng,et al.Study on the prediction method of durability of ductile failure of polyethylene[J].Pressure Vessel,2012,29(1):1–6.