Download or read book Fracture Toughness Testing of HDPE Plastic Pipe written by P. Fueler and published by . This book was released on 1981 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program to investigate the applicability of fracture toughness test methods to high density polyethylene pipe is described. Fracture toughness test specimens cut from pipe material were tested in a precracked three-point bending test at different rates. The load versus crack opening displacement record was used in an attempt to judge the validity of the test and to determine the fracture load. This method appears to need further development for this class of materials, as the results were difficult to interpret. Use of the maximum force for tests which appeared to fail in a quasibrittle manner resulted in calculation of a fracture toughness value which generally did not satisfy validity conditions. This value was used to predict the burst pressure of pipes containing surface cracks in the longitudinal direction. The prediction of burst pressure was slightly conservative, but in agreement with the trend of the experimental results. Fractographic analysis indicates three modes of crack propagation: ductile, quasibrittle, and brittle.
Download or read book Fracture Toughness Testing of HDPE Plastic Pipe written by Massachusetts Institute of Technology. Department of Materials Science and Engineering and published by . This book was released on 1979 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Toughness Testing of Polyethylene Pipe Materials written by WL. Bradley and published by . This book was released on 1988 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple-specimen J-integral tests, which are defined in the ASTM Test for JIc, A Measure of Fracture Toughness (E 813-81), have been conducted on side-grooved compact tension specimens of medium- and high-density polyethylene. The specimens were precracked with a razor blade, as has been common practice to date, or were fatigue precracked. Tests were performed over a 50 range of crosshead rates in the quasi-static regime. Results indicated that the razor notching gives a J-R curve which is significantly higher than that obtained using fatigue precracked specimens. A significant variation in the J-R curve was noted for changes in the displacement rate due to the viscoelastic character of the polyethylene. The orientation of the specimens, which were cut from actual pipe, was found to have a significant effect on the fracture toughness. The fracture toughness results were correlated with fractographic results, and the behavior of side-grooved and non-side-grooved specimens was compared.
Download or read book Physical Testing of Plastics written by R. Evans and published by ASTM International. This book was released on 1981 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applicability of Plane Strain Fracture Toughness Testing Techniques to Polyethylene Pipe Materials written by Daniel Ryal Roberts and published by . This book was released on 1981 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Study of the Applicability of Plane Strain Fracture Toughness Test Techniques to Plastic Pipe Materials written by Peter Flüeler and published by . This book was released on 1978 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plane Strain Fracture Toughness of Polyethylene Pipe Materials written by Ahmed El-Sayed Younis Darwish and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Testing of Plastics written by Robert E. Evans and published by . This book was released on 1981 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Product Failure written by P.R. Lewis and published by iSmithers Rapra Publishing. This book was released on 2000 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of polymers in product design has continued to grow at a rate unrivalled by conventional materials such as metal, ceramics or glass. More polymeric materials are becoming available to the designer, and this report highlights the need for caution in new design work, for careful use of new materials, and for awareness of the product environment. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database gives useful references for further reading.
Download or read book Methods of Test for Plastics Pipes and Fittings written by Standards Australia International and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Toughness Testing and Its Applications written by and published by ASTM International. This book was released on 1965 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASTM Special Technical Publication written by and published by . This book was released on 1981 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods of test for plastics pipes and fittings Method 19 C ring test for fracture toughness of PVC pipes written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods of Test for Plastics Pipes and Fittings written by Standards Association of Australia and published by . This book was released on 1999 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Characterization of Recycled HDPE Nanoclay Composites written by Suk Joon Na and published by . This book was released on 2016 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: High density polyethylene (HDPE) is one of the most widely used engineering plastics in infrastructures, particularly in a pipeline system. Current HDPE pipes are made from pristine resin which directly relies on petroleum supply. Utilizing recycled HDPE to replace a portion of pristine resin certainly provides benefits in improving the sustainability of the HDPE pipes and saving raw materials. However, challenges still remain to apply the recycled material for engineering applications which specifically require the long-term service life performance. Recycled materials generally possess inferior material properties to the pristine counterpart, and they have a higher risk of failure caused by stress cracking within a desired lifetime. To suggest a solution to the concern, this research focuses on a new class of materials which are polymer/nanoclay composites (PNCs). The presence of a small amount of nanoclay significantly enhances the properties by increasing mechanical properties, flammability resistance and surface scratch resistance while decreasing gas permeability. However, the fracture resistance of the recycle-based PNCs, particularly stress crack resistance (SCR), has not been studied yet. This research therefore evaluates the effect of nanoclay on the short-term and long-term fracture resistance of pristine/recycled HDPE pipe material. The short-term fracture resistance was characterized using the essential work of fracture (EWF) concept test. The results revealed that nanoclay has not produced significant toughening effect and causes embrittlement of the materials. Adding nanoclay to pristine HDPE, a steady decrease in fracture toughness was measured until 4-wt% of nanoclay after which the change was insignificant. Conversely, nanoclay content more than 2-wt% in recycle-blends greatly decreased the fracture toughness value. The long-term SCR via slow crack growth (SCG) mechanism was evaluated by means of the Notched Constant Ligament Stress (NCTL) test. The result revealed that, unlike the short-term fracture resistance, the nanoclay enhanced SCR and extended the failure time. By integrating the short-term and long-term failure behavior employing the elastic-plastic fracture mechanics, a correlation between the fracture toughness and SCG was accomplished in this study.
Download or read book Methods of test for plastics pipes and fittings Method 19 C ring testy for fracture toughness of PVC pipes written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
