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    Item type:Publication, Access status: without files ,
    Influence of production process to product performance
    (2019)
    Flamm, Martin
    ;
    Eitzen, Arne von
    ;
    Ernst, Sebastian
    Manufacturing rubber components is a complex process. It is well known, that this manufacturing process influences the properties of the final part. It is a challenge to install a reliable production process after the development process of a rubber part, that includes the material choice and in many cases the choice of the bonding system and the tooling geometry. The goal is for example to achieve a necessary stiffness and fatigue performance of the final rubber part. Thus the step from the single development and manufacturing to mass production is very important for later part performance. In this step many mistakes can occur. This paper discusses some parameters of the production process and shows effects in the final part that can be influenced by the production process.
    Publicationtype: Conference Paper
      112
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    Item type:Publication, Access status: without files ,
    Lifetime estimation of NR under thermal and mechanical loads
    (CRC Press, 2015)
    Ernst, Sebastian
    ;
    Weltin, Uwe
    ;
    Flamm, Martin
    In many applications rubber parts have to withstand thermal and mechanical loads. While the demanded service temperatures increase, the parts are sooner or later operated near their aging limit. Rubber parts aged beyond their thermal aging limit are incapable of surviving any relevant mechanical load. Fatigue tests show that the fatigue strength can increase significantly before finally dropping towards the aging limit. For parts failing near their aging limit, a sequential aging scheme with one thermal aging phase and one fatigue phase can vastly skew lifetime estimations. It is shown that in these cases an alternating aging scheme is more suitable. With an aging parameter describing the severity of an age state, thermal load spectra can be considered during lifetime estimations. Moreover the fatigue strength of an exemplary natural rubber compound is displayed in a novel diagram showing the fatigue strength for various age states.
    Publicationtype: Conference Paper
      51
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    Item type:Publication, Access status: without files ,
    Ageing under preload
    (CRC Press, 2013)
    Ernst, Sebastian
    ;
    Weltin, Uwe
    ;
    Flamm, Martin
    In the field rubber parts are exposed to the environment and mechanical loads for long periods of time. During this time material properties change due to chemical and physical aging mechanisms. Over time the combination of chemical aging with a static mechanical load leads to a permanent deformation. Experimental results are presented, which show the diverse influence of a static load during thermal aging on the material properties and on the stress state of a specimen. The resulting inhomogeneous stress state of specimens aged with preload can influence the lifetime considerably. © 2013 Taylor & Francis Group.
    Publicationtype: Conference Paper
      86