Novel Double Cantilever Beam experiments and related evaluation methods to investigate the fracture behaviour of adhesive layers in modes I and III

dc.contributor.advisorMarzi, Stephan
dc.contributor.advisorChatterjee, Sangam
dc.contributor.authorSchrader, Peer
dc.date.accessioned2023-07-21T06:47:18Z
dc.date.available2023-07-21T06:47:18Z
dc.date.issued2022
dc.description.abstractThis cumulative dissertation consists of four manuscripts dealing with the fracture mechanics testing of adhesive layers in pure loading modes I and III. Different Double Cantilever Beam (DCB) test specimens are used to investigate the energy release rate and cohesive traction of rigid, epoxy-based and soft, rubber-based adhesive systems under different boundary conditions. New test setups and evaluation methods are developed to gain a better understanding of the fracture behaviour of these adhesive joints and to investigate the influence of different evaluation methods on the results. In order to investigate the fracture behaviour of epoxy-based bonded joints, the Out-of-plane Loaded Double Cantilever Beam (ODCB) test was extended to higher loading rates, which, with the help of a local strain measurement, allowed the determination of fracture energy and cohesive traction in mode III at increased loading rates for the first time. However, it became apparent that ODCB tests, which have to be carried out in a bi-axial testing machine, are probably not suitable for testing under impact. Hence, uni-axial test rigs were developed to enable mode III testing of such adhesive joints. These were carried out quasi-statically to investigate the influence of different evaluation methods in more detail. The rate-dependent fracture behaviour of soft, rubber-like adhesives was also investigated, which includes both a creep load in pure mode I and an investigation at increased loading rates in modes I and III. For the investigation under creep loading, a method is proposed which allows the control of the tests on constant J-integral. In addition, the influence of the material behaviour within the process zone is examined in more detail, as this influences both the creep behaviour and the cohesive stresses and their evaluation methods. For the determination of the cohesive traction, a new method is developed within the scope of the work, which is based on the strain measurement along with the adherends and thereby enables a determination of the dependence of the cohesive stresses on the loading rate along the entire adhesive layer. A comparison with the conventional method of determining the cohesive traction from the derivative of the energy release rate with respect to the crack opening displacement showed that the currently applied method may deliver inadequate results. The results of this work thus extend the state of the state of research and in doing so demonstrate new methods that can be used in DCB tests in modes I and III to provide new insights into the fracture behaviour of adhesively bonded joints.de_DE
dc.description.sponsorshipSonstige Drittmittelgeber/-innende_DE
dc.identifier.urihttps://jlupub.ub.uni-giessen.de//handle/jlupub/18246
dc.identifier.urihttp://dx.doi.org/10.22029/jlupub-17613
dc.language.isoende_DE
dc.relation.hasparthttps://doi.org/10.1016/j.ijadhadh.2021.103079de_DE
dc.relation.hasparthttps://doi.org/10.1016/j.ijadhadh.2021.103078de_DE
dc.relation.hasparthttps://doi.org/10.1016/j.ijadhadh.2021.103078de_DE
dc.relation.hasparthttps://doi.org/10.1016/j.tafmec.2022.103699de_DE
dc.rightsIn Copyright*
dc.rights.urihttp://rightsstatements.org/page/InC/1.0/*
dc.subjectJ-Integralde_DE
dc.subjectfracture mechanicsde_DE
dc.subjectDouble Cantilever Beamde_DE
dc.subjectOut-of-plane loaded Double Cantilever Beamde_DE
dc.subjectcohesive tractionde_DE
dc.subjectIrwin-Kies-Equationde_DE
dc.subjectEnergy Release Ratede_DE
dc.subjectprocess zonede_DE
dc.subjectrubber-like adhesivesde_DE
dc.subjectepoxy adhesivesde_DE
dc.subjectbackface strainde_DE
dc.subjectrate-dependencyde_DE
dc.subjectadhesive jointsde_DE
dc.subjectadhesive testingde_DE
dc.subject.ddcddc:620de_DE
dc.titleNovel Double Cantilever Beam experiments and related evaluation methods to investigate the fracture behaviour of adhesive layers in modes I and IIIde_DE
dc.typedoctoralThesisde_DE
dcterms.dateAccepted2023-07-05
local.affiliationPZI Promotionszentrum für Ingenieurwissenschaftende_DE
local.commentDiese Dissertation wurde im Rahmen der Promotion über das Promotionszentrum für Ingenieurwissenschaften (PZI) am Forschungscampus Mittelhessen erstellt. Es handelt sich um die Dissertation in ihrer ursprünglichen Abgabeversion. Die Paper C und D der kumulativen Dissertation sind in dieser Version noch als Preprint enthalten. Zum Zeitpunkt der Veröffentlichung wurden diese Paper bereits in internationalen Journals veröffentlicht. Die angegebenen DOIs führen zu den Veröffentlichungen in ihrer peer-reviewten Fassung.de_DE
thesis.levelthesis.doctoralde_DE

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