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RISS 인기검색어
- 검색키워드
- 저자 : Steinwender, G. (검색결과 3 건)
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FATIGUE SIMULATION OF POWER TRAIN COMPONENTS DURING THE DESIGN PROCESS
Steiner, W.,Steinwender, G.,Unger, B. The Korean Society of Automotive Engineers 2001 International journal of automotive technology Vol.2 No.1
The lifetime of power train components can be improved dramatically by finding crack initiation points with suitable software tools and optimization of the critical areas. With increasing capacities of computers the prediction of the lifetime for components by numerical methods gets more and more important. This paper discusses some applications of the outstanding fatigue simulation program FEMFAT supporting the assessment of uniaxially and multiaxially loaded components (as well as welding seams and spot joints). The theory applied in FEMFAT differs in some aspects from classical approaches like the nominal stress concept or the local one and can be characterized by the term "influence parameter method". The specimen S/N-curve is locally modified by different influence parameters as stress-gradient to take into account notch effects, mean-stress influence which is quantified by means of a Haigh-diagram, surface roughness and treatments, temperature, technological size, etc. It is possible to consider plastic deformations resulting in mean-stress rearrangements. The dynamic loading of power train components is very often multiaxial, e.g. the stress state at each time is not proportional to one single stress state. Hence, the directions of the principal axes vary with time. We will present the way how such complex load situations can be handled with FEMFAT by the examples of a crank case and a gear box.
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FATIGUE SIMULATION OF POWER TRAIN COMPONENTS DURING THE DESIGN PROCESS
W. STEINER,G. STEINWENDER,B. UNGER 한국자동차공학회 2001 International journal of automotive technology Vol.2 No.1
The lifetime of power train components can be improved dramatically by finding crack initiation points with suitable software tools and optimization of the critical areas. With increasing capacities of computers the prediction of the lifetime for components by numerical methods gets more and more important. This paper discusses some applications of the outstanding fatigue simulation program FEMFAT supporting the assessment of uniaxially and multiaxially loaded components (as well as welding seams and spot joints). The theory applied in FEMFAT differs in some aspects from classical approaches like the nominal stress concept or the local one and can be characterized by the term "influence parameter method" The specimen S/N-curve is locally modified by different influence parameters as stressgradient to take into account notch effects. mean-stress influence which is quantified by means of a Haigh-diagram. surface roughness and treatments. temperature. technological size etc. It is possible to consider plastic deformations resulting in mean-stress rearrangements. The dynamic loading of power train components is very often multiaxial. e.g. the stress state at each time is not proportional to one single stress state. Hence. the directions of the principal axes vary with time. We will present the way how such complex load situations can be handled with FEMFAT by the examples of a crank case and a gear box.<br/>
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Kleespies, Regina G.,Lim, Young Woon,Tkaczuk, Cezary,Wrzosek, Marta,Steinwender, Bernhardt M.,Wegensteiner, Rudolf Elsevier 2017 Journal of invertebrate pathology Vol.143 No.-
<P><B>Abstract</B></P> <P> <I>Ips sexdentatus</I> (six-spined engraver beetle) from Austria and Poland were dissected and examined for the presence of pathogens. Specimens collected in Austria were found to contain the ascomycetous fungus <I>Metschnikowia</I> cf. <I>typographi</I>. Infection rates ranged from 3.6% to 26.8% at different collection sites. <I>M.</I> cf. <I>typographi</I> infected midguts were investigated by histological, ultrastructural and molecular techniques. Extraordinary ultrastructural details are shown, such as ascospores with bilateral flattened flanks resembling alar rims at both sides of their attenuating tube-like ends. These have not yet been described in other yeast species. Molecular investigations showed a close phylogenetic relationship to the fungi <I>Metschnikowia agaves</I> and <I>Candida wancherniae</I>. Presence of the entomopathogenic fungus <I>Beauveria bassiana</I> found in Austria was confirmed both morphologically and molecularly. The eugregarine <I>Gregarina typographi</I> was diagnosed most frequently. Infection rates of all <I>I. sexdentatus</I> specimens ranged from 21.4% to 71.9% in Austria and 54.1% to 68.8% in Poland. Other entomopathogenic protists, bacteria, or viruses were not detected.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Prevalence of <I>Metschnikowia</I> cf. <I>typographi</I> in <I>Ips sexdentatus</I> is described. </LI> <LI> Extraordinary ultrastructural details of <I>M.</I> cf. <I>typographi</I> are shown first with TEM. </LI> <LI> Phylogenetic relationship of <I>M.</I> cf. <I>typographi</I> is presented. </LI> <LI> Close relationship to <I>Metschnikowia agaves</I> and <I>Candida wancherniae</I> is shown. </LI> <LI> <I>Gregarina typographi</I> was diagnosed most frequently in Austria and Poland. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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