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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2007

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Anisotropy of physical properties injection moulded parts and its analysis

100%

Postawa P. , Gnatowski A.

Journal of Achievements in Materials and Manufacturing Engineering

2007

tom Vol. 23, nr 2

35-38

Purpose: Anisotropy of physical properties in injection mouldings is a phenomenon commonly performing and very difficult to avoid. However in some cases for its size occurring of diversity of the property the using of such a element is becoming impossible. Chosen effects of examinations of anisotropy of properties depending on of the place and the method of the sampling research were presented in the article. Design/methodology/approach: A Dynamic Mechanical Thermal Analysis method giving possibility in the very precise solution was take advantage in examinations of differences between samples taken from each places injection moulding part. Research samples were cut from the flat plate and then were taken advantage to research. The method of the sampling was presented in the figure. Findings: How were presented in the discussion of effects of research in polymer materials processing particularly thermoplastics polymers, anisotropy of physical properties with indispensable phenomenon. Occurring anisotropy is involving diversity of durability of each areas of injection moulding part and different behaviour oneself during using. Samples taken from the beginning of the flow way were marked by better mechanical properties but poor suppressing properties. However samples taken parallel to the direction of the polymer flow in the mould were marked (in temperatures over 40 deg) with better suppressing properties. Practical implications: Analysis of examinations of anisotropy of mechanical and using properties in injection molded parts (presented in the article) could find practical application in polymer processing industry, both small and large enterprises. There are many problems with very complicated mouldings and the know-how presented in this article could be very useful industry application. Originality/value: New approach to precocious estimation anisotropy of physical properties were present in the paper.

Analysis of changes in bone cement damping factor and its effect on bone load

100%

Postawa P. , Szarek A.

Journal of Achievements in Materials and Manufacturing Engineering

2007

tom Vol. 23, nr 1

35-38

Purpose: The article presents the results of simulations and material-related investigations for bone cement used for alloplasty of hip joint. Mechanical properties of bone cements are of key importance for a successful surgery and further use of the joint as well as its behaviour during complex load which appears during patient's walk. Design/methodology/approach: One of the methods of thermal analysis for polymeric materials has been used for investigations. DMTA method is based on the analysis of the signal (reaction) from the deformed material under particular conditions, at the changeable ambient temperature as well as frequency and amplitude of vibrations. DMTA thermograms give information on change in storage modulus E' and the mechanical loss factor tg delta, which is responsible for dissipation of energy during deformation. Findings: During simulation investigations ADINA engineering environment has been used; it enabled, at the assumed boundary and initial conditions, to assess the stress which appears in individual cross-sections of the analysed bone and the implant fixed by means of bone cement. During the analysis the cross-sections have been presented and the values of the stress which appears in individual zones have been determined. Research limitations/implications: Due to high complexity, only the results of simulation software have been used, clinic trials will be possible not before thorough check and analysis of the obtained results. Practical implications: Practical application of the results of the investigations described in this paper will be possible after long and comprehensive clinical trials. Originality/value: Original value of this paper are the results of tests since such an analysis has never been conducted by scientific environment working on this subject.