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Abstract
Specific heat capacity of boron nitride-filled polybenzoxazine has been investigated by using temperature-modulated differential scanning calorimetry, TMDSC, to study that it is a composite structure-insensitive property, i.e. independent of the degree of filler network formation. Many aspects of boron nitride filler such as particle size, particle surface area, particle shape, and filler loading are investigated. At the same filler loading, we observe insignificant change in composite specific heat capacity due to the effect of particle size, particle surface area, and particle shape. Filler loading is found to be the only aspect of filler that can change the specific heat capacity of this filled system. A linear relationship between the composite heat capacities and filler loading is observed and can be predicted by the rule of mixture with an error within ±1%. Within the temperature range betwen 0 and 80°C, the temperature dependent heat capacity of this composite can simply be expressed in the form of a linear equation: C p=A+BT.
This paper gives a descriptive overview of the prototypical Hungarian auxiliary+infinitive construction, discussed in the framework of functional cognitive grammar worked out by Ronald Langacker and in the grammaticalization theory for auxiliaries by Bernd Heine. The degree of grammaticalization seems to have a greater role in the construction than suggested in the previous literature, while Langacker’s theory (fit for English) needs some modification. In the construction discussed here, the auxiliary profiles a process, and (future) tense or modality. The infinitive accounts for most of the semantic content of the overall event structure. Both component structures contribute equally to the profile of the construction (the composite structure), in a complementary way, in contrast with a prototypical composite structure. I assume that the Hungarian auxiliary serves the function of imposing temporality on a nontemporal infinitive, and also that of the grounding predication, which marks a departure from Langacker’s English model. The Hungarian grounding predication (the auxiliary) and its head (the infinitive) do not belong to the same grammatical class, only the auxiliary+infinitive composite structure construes a process temporally. Also, degrees of subjectification contribute to types of construal, yielding a dimension of variation that cannot be derived from the deontic/epistemic distinction. Just like the semantic functions of the auxiliaries, subjectification and grounding show gradual characteristics.
., Springer G. S . Mechanics of composite structures , 2003 . [19] Composite sandwich optimizer , 2017 , https://github.com/dinospiller/Composite-Sandwich-Optimizer (last visited 5 September 2019).
The paper presents procedures of the slip calculation in steel and concrete composite structures under quasi-long-term load with flexible stud connectors. To describe the slip relation s = s (P), exponential functions are used as appropriate for using in engineering practice. The former already existing expressions for calculating the slip for short-term loads were generalized. The values of factors for the formula were determined on the basis of the experimental investigation.
Abstract
A group of cyanoethylated amine (CEA) has been synthesized by carefully reacting triethylenetetramine with varying proportions of acrylonitrile. Such CEAs were utilized as hardener for the curing of epoxy resin. The effect of cyanoethylation of amine on their curing reaction with epoxy resin has been studied by differential scanning calorimeter (DSC). The processing temperature for the fabrication of composite is estimated from the DSC analysis with an approach to satisfy the logical selection of temperature for application of pressure during processing of a composite structure. The exotherm of such curing reaction (ΔH ex) and the degree of cyanoethylation (CEt) of the amine follow the relation ΔH ex = (324–68.40 CEt) J g−1.
Abstract
Reconstructing impact forces can improve considerably structural health monitoring as the extent of damage can be better made out. In this work an inverse problem formulation to identify the pressure generated by a non punctual impact is investigated. Considering the case of linear elastic layered composite structures, reconstruction of impact pressure is performed through a finite element model of the structure and impulse response functions between the impact zone and sensors placed at known positions. Assuming that the pressure is uniform, reconstruction is carried out by regularized deconvolution based on generalized singular value decomposition. The infl uence of mesh size, modal truncation and time sampling on the reconstructed pressure is discussed.
steel structures. Present status and further development. In: Proceedings of 5th European Conference on Steel and Composite Structures . Vol. A 13-18. Graz 2008. ECCS Brussels Fernezelyi S.: Csavarozott kapcsolatok
Nowadays the most modern and economical bridges are designed as composite structures with orthotropic plates. In a traditionally designed composite bridge the trapezoidal, longitudinal stiffener is attached, welded to the cross girder web and to the bottom flange of the main girder. However in recent composite bridges with orthotropic plates designed by the UVATERV Co. the cross girder web and the trapezoidal, longitudinal stiffeners are not connected. This is a very important improvement, since in this way the amount of cutting and welding work can be reduced, however more importantly there is no need to consider the fatigue of the welds between the longitudinal stiffener and the cross girder web. On the other hand the disadvantage of this design that the plate-buckling phenomenon of the free edge must be taken into account. This paper studies the new orthotropic plate by the experimental tests.
Abstract
Nowadays, due to savings requirements, the heights of floor systems in multi-story buildings are reduced. To ensure passage of installation within a floor depth, a solution considering web openings is usually adopted in steel-concrete composite structures. Owing to the presence of web openings, the structural performance of a bearing member is affected not only in the final stage but also during the construction. Hence, the main purpose of this research is to evaluate the impact of web openings on the lateral-torsional buckling resistance of the steel part of composite girder in the erection stage. Comparison of lateral-torsional resistance of the steel girders with web openings derived by the analytical approach with results obtained by numerical model is presented and discussed.
Structures , Vol. 1, No. 1, 2001, pp. 97–110. Ommen M. Behaviour and design of structural steel pins Steel and Composite Structures
