Alterungseffekte im Zeitraffertest

Gleich, Henning; Lohse, Hartwig

doi:10.1007/s35145-017-0028-4

Cited by 3 publications

(1 citation statement)

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“…The most important fracture patterns of adhesive connections were classified in ISO 10365. In this classified case of delamination, humidity penetrates the interface along the cutting edge [ 18 ]. Delamination is defined as the separation of two contiguous layers along the interface due to mechanical stress and chemical reactions [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

Predicting Corrosion Delamination Failure in Active Implantable Medical Devices: Analytical Model and Validation Strategy

et al. 2021

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The ingress of body fluids or their constituents is one of the main causes of failure of active implantable medical devices (AIMDs). Progressive delamination takes its origin at the junctions where exposed electrodes and conductive pathways enter the implant interior. The description of this interface is considered challenging because electrochemically-diffusively coupled processes are involved. Furthermore, standard tests and specimens, with clearly defined 3-phase boundaries (body fluid-metal-polymer), are lacking. We focus on polymers as substrate and encapsulation and present a simple method to fabricate reliable test specimens with defined boundaries. By using silicone rubber as standard material in active implant encapsulation in combination with a metal surface, a corrosion-triggered delamination process was observed that can be universalised towards typical AIMD electrode materials. Copper was used instead of medical grade platinum since surface energies are comparable but corrosion occurs faster. The finding is that two processes are superimposed there: First, diffusion-limited chemical reactions at interfaces that undermine the layer adhesion. The second process is the influx of ions and body fluid components that leave the aqueous phase and migrate through the rubber to internal interfaces. The latter observation is new for active implants. Our mathematical description with a Stefan-model coupled to volume diffusion reproduces the experimental data in good agreement and lends itself to further generalisation.

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Section: Methodsmentioning

confidence: 99%

Predicting Corrosion Delamination Failure in Active Implantable Medical Devices: Analytical Model and Validation Strategy

et al. 2021

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Anwendung der DIN 2304 im Konstruktiven Glasbau

Böhm

Kahlmeyer

2019

ce papers

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Die DIN 2304 konkretisiert seit 2016 die ISO 9001 für den "speziellen Prozess" Kleben. Es handelt sich hierbei um eine Anwender-Norm, die für alle Branchen -in Industrie und Handwerk -und alle Klebungen gilt, deren Hauptfunktion in der Übertragung mechanischer Lasten liegt. Als zentrale Punkte eines qualitätsgerechten und robusten Klebprozesses gibt die Norm eine Einteilung der Klebung nach der Sicherheitsanforderung, nach den Qualifikationsstufen des ausführenden und des Klebaufsichtspersonals und nach der Nachweisführung vor. Die DIN 2304 gilt allerdings nicht für Klebverbindungen, deren Herstellung bereits durch anerkannte und bewährte Regelwerke, bestehende Zulassungen oder andere Normen geregelt wird. Application of DIN 2304 in glass construction.Since 2016, the DIN 2304 has been specifying the ISO 9001 in terms of the "special process" of adhesive bonding. This user standard applies to all sectors in industry and trade and in general to all bonded joints whose main function is the transmission of mechanical loads. The standard classifies the requirements for safety, qualification of the executing and supervising employees as well as the verification procedure as central points of a qualityappropriate and robust bonding process. However, the DIN 2304 does not apply to bonded joints which are already regulated by recognized and proven regulations, existing approvals or other standards.

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