Failure and fracture mechanisms of injection-molded plastic products
| Autor: | M. J. M. Van Der Zwet, A. J. Heidweiller |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
Birefringence Polymers and Plastics General Chemistry Surfaces Coatings and Films chemistry.chemical_compound Brittleness Injection molding process chemistry Ultimate tensile strength Materials Chemistry Finite element method analysis Low-cycle fatigue Methyl methacrylate Composite material |
| Zdroj: | Journal of Applied Polymer Science. 67:1473-1487 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/(sici)1097-4628(19980222)67:8<1473::aid-app13>3.0.co;2-2 |
| Popis: | The effect of geometry transitions on the mechanical load-carrying ability of specimens has been studied. Special attention has been given to a potentially positive influence of the injection molding process. Tensile tests, three-point bending tests, and low cycle fatigue tests were performed on specimens with either drilled or molded-in holes. Tests were conducted at various temperatures and deformation rates. Two commercial grades of poly(methyl methacrylate) have been applied. To obtain a better understanding of the fracture mechanism, the fracture surface morphology was related to the molecular orientation investigated by the birefringence method and the results of a finite element method analysis. The extent of redistribution of stresses seemed considerable, even in the case of a brittle material like poly(methyl methacrylate). As a result, the linear theory is a safe, but very conservative, approach for the load-carrying ability of plastic products. It also seemed that injection molding may have a favorable influence on load-carrying ability. This result could be related to the fracture mechanism. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1473–1487, 1998 |
| Databáze: | OpenAIRE |
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