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The correlation of slow crack growth in linear polyethylene by the J-integral |
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| Authors: | Xici Lu Norman Brown John L. Bassani |
| Affiliation: | Department of Materials Science & Engineering, University of Pennsylvania, Philadelphia, PA 19104-6272, USA Department of Mechanical Engineering, University of Pennsylvania, Philadelphia, PA 19104-6272, USA |
| Abstract: | The fracture of a polyethylene (PE) homopolymer by slow crack growth was measured with a three point bending (TPB) specimen and a single edge notch tension (SENT) specimen. The crack growth rate correlated with the stress intensity for each type of specimen. However, for a given K, SENT specimens exhibited a faster crack growth rate than TPB specimens. Since PE is non-linear, the J-integral is more appropriate than K and it was found that J does correlate the SENT and TPB results. In addition, the degree of non-linearity of the PE was increased by quenching. For the quenched state it was also found that J correlated the SENT and TPB results in accordance with the dependence of J on the degree of non-linearity of the material. |
| Keywords: | polyethylene slow crack growth rate non-linear deformation J-integral |
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