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Thermoplastic fibre metal laminates: Stiffness properties and forming behaviour by means of deep drawing

Wollmann T., Hahn M., Wiedemann S., Zeiser A., Jaschinski J., Modler N., Ben Khalifa N., Meißen F., Paul C.

Archives of Civil and Mechanical Engineering

2018

Vol. 18, no. 2

442--450

Hybrid materials provide a high potential for lighter structures and an improved crash performance. The investigated hybrid sandwich laminate consists of steel cover sheets and a carbon fibre-reinforced thermoplastic core. The first part of this investigation is focusing on an analytical prediction as well as on a comparison of numerical and experimental results for the evaluation of the laminate properties to get a general understanding for the material. Within the second part the forming behaviour of this material is investigated experimentally, analytically and numerically by means of cup deep drawing. These results indicate that cup deep drawing of thermoplastic fibre metal laminates is possible but limited. The limits in terms of achievable drawing depths are found to be defined by cracking and wrinkling of the cover sheets as well as fibre failure in the composite material.

Properties of sandwich metals joined by explosive cladding method

Čížek L., Ostroushko D., Szulc Z., Molak R., Praźmowski M.

Archives of Materials Science and Engineering

2010

Vol. 43, nr 1

21-29

Purpose: Paper presents results of investigations with two layers explosively formed sandwich composite consisting of different composition joint which requires very often knowledge of structure and mechanical properties. These properties are connected with microstructure that is influenced by technological factors under cladding. Design/methodology/approach: The sample bars were prepared from explosively formed sandwich composite near the join area. The methods of the light microscopy and the hardness and tensile test for evaluation of quality of joined sandwich metals were used. Investigations by a new fatigue method in the case sandwich composite steel CrNi(18/10) + Ti were completed. Findings: Measurement of micro-hardness in the zone of the joint a deformation of materials shows an increase value of that. Detailed metallographic observation detected in proximity of the joints an occurrence of structural non-homogeneities. Steel and titanium interface surfaces are corrugated. New fatigue method in the case sandwich composite steel CrNi(18/10) + Ti were verified. Research limitations/implications: Knowledge of microstructure characteristics will be extended by the method of SEM, including micro-analysis of individual structural components and surface analysis. Influence of experiment conditions on results of fatigue test must be more elaborated in future. Practical implications: The results may be utilized for a relation between structure and properties of the investigated materials in process of manufacturing. Originality/value: These results contribute to complex evaluation of properties explosively formed sandwich composite namely for explanation of structure developed new sandwich composites. The results of this paper are determined for research workers deal by development new exploitations of new sandwich composites.