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Document Type |
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Article In Journal |
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Document Title |
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The Temperature Effects On High Density Polyethylene (HDPE) Pipes تأثير درجات الحرارة على أنابيب متعدد الإثيلين عالي الكثافة |
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Subject |
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Original Works |
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Document Language |
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English |
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Abstract |
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The mechanical characteristics and properties of T-1DPE ipes are highly affected by the environmental conditions. In this investigation the influence of temperature on the mechanical characteristics (i.e., stress- strain) curves as well as the viscoelastic’Troperties of thcse tubes is examined. A range of testing temperatures of 23 to 80°C is covered for HDPE pipes of both classes (3) and (5) with working pressures of 4 and 10 bars respectively. Various pipe sizes ranging from 16 to 32mm are investigated. In this investigation, mainly, the standard .lapanesc axial tensile test (JIS K6761) is employed.
The results of this investigation show that all pipes tested exhibit temperature sensitivity to varying degrees (i.e., decreased resistance to deformation as the temperature is increased) regardless of the pipe size and class. All the mechanical properties of these tubes except for ductility are decreased non-linearly as the testing temperature increases- The values of the yield stress, tensile strength, modulus of elasticity, and specific work are found to be degraded by about 45 to 60% over the tested range of temperatures. Generally, the pipes of class (5) are found to be superior to pipes of class (3) in all their mechanical properties over the whole testing range of temperatures. Finally, polymer degradation problem is discussed, including its principles, causes, mechanisms and factors affecting this phenomena. Also, the thermal and mechanical degradation types of HDPE pipes in particular are discussed and presented. |
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ISSN |
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1319-1047 |
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Journal Name |
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Engineering Sciences Journal |
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Volume |
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8 |
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Issue Number |
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1 |
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Publishing Year |
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1416 AH
1996 AD |
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Number Of Pages |
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13 |
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Article Type |
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Article |
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Added Date |
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Sunday, October 11, 2009 |
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Researchers
| ماهر حمدي الصاحب | MAHIR H .H. ES-SAHEB | Researcher | | |
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