Concepts for interface engineering and characterization in composite hybrid structures

Serna, J.; Zinn, Carolin; Scharf, Ingolf; Dittes, Axel; Schwoebel, Stephan Daniel; Schmidt, Carsten; Meiners, Dieter; Schaper, Mirko; Lampke, Thomas

doi:10.1088/1757-899x/480/1/012014

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…For the manufacturing of intrinsic metal-CFRP hybrids, different processes are suitable. In [12], rotational moulding is used to produce shaft connections while in [13], automated fibre placement (AFP) is used to build up multilayer inserts. The good mechanical performance of such a hybrid specimen under laboratory conditions in quasi-static and dynamic tension testing is shown in [3,6].…”

Section: Intrinsic Metal-cfrp-hybridsmentioning

confidence: 99%

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Mechanical Behaviour of a Metal-CFRP-Hybrid Structure and Its Components under Quasi-Static and Dynamic Load at Elevated Temperature

2022

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Hybrid materials containing a light metal and CFRP are capable to make a relevant contribution in lightweight design and thereby in reducing greenhouse gases causing global warming. An aluminium CFRP-hybrid specimen with a thermoplastic interlayer that is suitable for application for the A-, B-, or C-pillar in a car is investigated in this work regarding the mechanical behaviour due to temperature variation. For this purpose, quasi-static as well as dynamic tensile tests are carried out not only for those hybrid specimens but also for their respective single-material components. Those are supported by various non-destructive testing (NDT) techniques such as thermography and CT-scans of X-ray tomography. The examination of the single materials as well as the hybrid specimens gives us the possibility to understand if a change in the damage process of the hybrid is caused by one of the single materials or the interaction of them. The use of the NDT techniques in combination with the mechanical experiments allows us to obtain a deeper look at the mechanisms causing the respective damage. It stands out that temperature changes affect the damage mechanisms in the hybrid significantly without having great influence on the single materials. In quasistatic testing, the maximum displacement of the hybrid specimens rises at elevated temperature, and in dynamic testing the initial stiffness and the sustained cycles decline significantly. It therefore can be concluded that the interfaces inside the hybrids are affected by temperature changes and play a major role concerning the damage mechanisms. The pure knowledge about the temperature behaviour of single materials is not sufficient for anticipating the behaviour of hybrid specimens under these restrictions.

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Section: Intrinsic Metal-cfrp-hybridsmentioning

confidence: 99%

Section: Intrinsic Metal-cfrp-hybridsmentioning

confidence: 99%

Mechanical Behaviour of a Metal-CFRP-Hybrid Structure and Its Components under Quasi-Static and Dynamic Load at Elevated Temperature

2022

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“…Several studies, especially on the structural bonding of titanium and aluminum, have revealed that a laser-induced nano structuring considerably improves the adhesion properties [5][6][7][8][9]. Preliminary investigations of the authors on hybrid structures out of steel or aluminum and carbon fiber reinforced polymers (CFRP) have shown that a laser pre-treatment of the metallic interface significantly increases the static and cyclic joint strength as well as the ageing resistance [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Polymer-Steel-Sandwich-Structures: Influence of Process Parameters on the Composite Strength

Lohr

Muth

Dreher

et al. 2019

KEM

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As the demand of the automotive and aerospace industries for lightweight and cost effective materials increases, it is necessary to combine different materials with respect to their lightweight and functional properties. The combination of polymer-steel-sandwich composites - which consist of a polymer core structure (transferring shear loads) and two metal face-layers (absorbing tensile and compression loads occurring at bending) - suite the need of minimizing weight per area under bending loads. The reduction of process steps can be achieved by connecting the face layers and core in-situ via an in-mold assembly process using variothermal processing. The injection mold hereby is heated near the melt temperature of the polymer with a variothermal water processing unit. Via contact heating inserted steel blanks are heated to the same temperature as the mold. This process enables the combination of the metal surface with the polymer core by infiltrating the micro or nano scale structure, which is generated by laser structuring or nano coating. Through the increased mold/blank surface temperature induced via variothermal heating the melt viscosity is lowered. This decreasing viscosity of the polymer melt hereby enables a higher degree of infiltration of the laser structured and nano coated blanks. This improved infiltration behavior is a key factor for the adhesion of the sandwich components and beneficial for the composites strength. Within this work two steel blanks are inserted into the mold to manufacture sandwich structures with steel face layers and a polymer (here: polylactidacid; PLA) core. As these sandwich composites are prone to bending failure, the 4-point-bending test is used to characterize the mechanical properties of this hybrid structure. The two surface treatments will also be compared concerning their mechanical interface properties with a shear edge test. The additional reduction on the polymer melt viscosity by means of gas inducing with chemical blowing agent is investigated on the laser structured surfaces only. To investigate the influence of the polymers melts viscosity on the bonding properties chemical blowing agent is added for some blanks.

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Schalenförmige Hybridverbunde und Inserts

Henning

Bernath

Bretz

et al. 2021

Intrinsische Hybridverbunde Für Leichtbautragstrukturen

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Concepts for interface engineering and characterization in composite hybrid structures

Cited by 5 publications

References 15 publications

Mechanical Behaviour of a Metal-CFRP-Hybrid Structure and Its Components under Quasi-Static and Dynamic Load at Elevated Temperature

Mechanical Behaviour of a Metal-CFRP-Hybrid Structure and Its Components under Quasi-Static and Dynamic Load at Elevated Temperature

Polymer-Steel-Sandwich-Structures: Influence of Process Parameters on the Composite Strength

Schalenförmige Hybridverbunde und Inserts

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