Design of an impact testing machine for polymer films by the free falling dart procedure
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Muhammad Musaddique Ali Rafique
Abstract
Impact forces have been used to study the behavior of materials for a long time. The aim of the impact testing is to investigate those conditions under which a material will fail in a brittle manner regarding a sudden load. There are three general methods of testing impact resistance of components: falling weight tests, pendulum tests and tumbling impact tests. In the present study, an attempt has been made to establish an impact tester used to carry out impact testing of plastic films by free falling dart method. In this, a box of wood with a hole on its upper side is used on which plastic film is held by clamps and a dart is allowed to fall onto film to note perforation. Then the impact resistance is statistically calculated. Impact resistance is determined by the energy caused by weight to fail 50 % of specimen. Practical results are found to be in good agreement with theory.
Kurzfassung
Aufprallbeanspruchungen werden schon seit geraumer Zeit angewendet, um das Materialverhalten zu untersuchen. Das Ziel der Aufprallprüfung besteht darin, die Bedingungen zu untersuchen, unter denen Werkstoffe unter einer plötzlichen Beanspruchung spröde versagen. Es gibt generell drei Verfahren, um Objekte bezüglich ihrer Schlagfestigkeit zu prüfen: Fallgewichtsversuche, Pendelversuche und Schleuderaufprallversuche. In der diesem Beitrag zugrunde liegenden Studie wurde der Versuch unternommen, eine Aufpralltestanlage zu etablieren, die verwendet werden kann, um Aufprallversuche mit frei fallenden, spitzen Stiften durchzuführen. Hierbei wird eine Holzkiste mit einer Bohrung an der Oberseite verwendet, auf die Plastikfilme mit Spannklauen gehalten werden und auf die ein entsprechender Stift fallen gelassen wird, um die Perforation oder andere Beschädigungen zu ermitteln und daraus statistisch die Schlagfestigkeit zu ermitteln. Die Schlagfestigkeit wird anhand der Energie bestimmt, die aus dem Gewicht resultiert, das die Probe zu 50 % beschädigt. Hierbei zeigen die praktischen Versuchsergebnisse gute Übereinstimmung mit den entsprechenden theoretischen Ergebnissen.
References
1 H. M.Richardson, F. W.Wilson (Eds.): Fundamental of Plastics, McGraw-Hill Book Company, New York, USA (1946)Suche in Google Scholar
2 M. L.Berins (Ed.): SPI Plastics Engineering Handbook, 5th Ed., Kulwer Academic Publishers, Norwell, Massachusetts, USA (2002)Suche in Google Scholar
3 V.Shah: Handbook of Plastics Testing Technology, John Wiley & Sons, New York, USA (1998)Suche in Google Scholar
4 I.Rubin (Ed.): Handbook of Plastic Materials and Technology, John Wiley & Sons, New York, USA (1990)Suche in Google Scholar
5 A. M.Chatterjee: Encyclopedia of Polymer Science and Engineering, Vol. 2, 2nd Ed., John Wiley & Sons, New York, USA (1985)Suche in Google Scholar
6 ASTM D1709-04 A (ISO 7765-1) and D4272 90 (ISO 7765-2): Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart MethodSuche in Google Scholar
© 2015, Carl Hanser Verlag, München
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Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Adhesive tensile testing of atmospheric plasma sprayed zinc coating on a 1.4301 substrate
- Fatigue strength of nodular cast iron with regard to heavy-wall applications
- Mechanical and corrosion properties of friction stir welded joints of Al-Cu alloy 2219-T87
- The effect of using heat treated ulexite and cashew in automotive friction materials
- Residual stress relaxation in welded large components
- Variation regulation of the acoustic emission energy parameter during the failure process of granite under uniaxial compression
- Iznik tiles: A new production technology and respective characterization
- Quality during milling of a glass fiber reinforced polymer composite
- Effect of abrasive water jet turning process parameters on surface roughness and material removal rate of AISI 1050 steel
- Influence of cutting parameters on the chip-tool interface temperature during the turning of Waspaloy
- Effects of the thixocasting injection velocity on tensile properties of an A357 Al alloy
- Solid mold investment casting – A replication process for open-cell foam metal production
- Design of an impact testing machine for polymer films by the free falling dart procedure
- Mechanical and electrical properties of Sb-Ga50Au10In40 alloys
- CFD simulation of particulate flow in a spiral concentrator
