Composites with epoxy matrix cannot be used in high temperature, while geopolymer matrix excel in high temperature resistance. First, prismatic specimens were subjected to conditioning temperature. Second, the tensile and bending test were performed at room temperature. This paper present comparison of mechanical properties of carbon/epoxy and carbon/geopolymer composites. Numerical simulations of tensile and bendidng tests were performed in finite element system Abaqus.
A joint using a metal pin is one possibility of how to achieve a removable joint of composites. The load capacity of a wrapped pin joint depends on many parameters, especially on the types of fibres and resin, and geometric properties of the joint. The composite part of a wrapped pin joint is exposed to a combination of the tension in the longitudinal direction and local compression in the transverse direction. The values of the compressive stress in the transverse direction can exceed several times the uniaxial compressive strength. In this work, CFRP (carbon-fibre-reinforced plastic) and GFRP (glass-fibre-reinforced plastic) parts of wrapped pin joints were tested. Experimental specimens with different geometries were exposed to a quasi-static loading. A Zwick/Roell Z050 testing machine was used for the tensile tests. Moreover, the load capacities of the carbon or glass composite parts were determined using a finite-element analysis. A new measure based on the LaRC04 criterion was proposed for the prediction of the load capacity. The numerical and experimental results were compared. Keywords: composite, finite-element method, load capacity, loop criterion, wrapped pin joint Spoji z uporabo kovinskega zati~a so ena od mo`nosti, kako dose~i odstranljivo kompozitno povezavo. Nosilnost zavite sti~ne povezave je odvisna od mnogih parametrov, posebno od vrste vlaken in smole ter geometrijskih lastnosti povezave. Kompozitni del zavite zati~ne povezave je izpostavljen kombinaciji napetosti v vzdol`ni smeri in lokalnim tlakom v pre~ni smeri. Vrednosti tla~nih napetosti v pre~ni smeri lahko ve~krat prese`ejo enoosno tla~no trdnost. V tem delu so bili preizku{eni zaviti zati~ni spoji z deli iz CFRP (plastika, oja~ana z ogljikovimi vlakni) in GFRP (plastika, oja~ana s steklenimi vlakni). Preizkusni vzorci z razli~no geometrijo so bili izpostavljeni kvazistati~ni obremenitvi. Za natezne preizkuse je bila uporabljena naprava Zwick/Roell Z050. Poleg tega je bila nosilnost kompozitnih delov z ogljikovimi ali steklastimi vlakni dolo~ena z uporabo analize kon~nih elementov. Novo merilo, ki temelji na merilu LaRC04, je bilo predlagano za napovedovanje nosilnosti. Primerjani so numeri~ni in eksperimentalni rezultati. Klju~ne besede: kompozit, metoda kon~nih elementov, nosilnost, merilo zanke, zavit spoj s kovinskim zati~em
Abstract.A type of surface and a surface treatment of the adherends has a great influence on strength and durability of bonded joints. This paper deals with an experimental testing of influence of adherent surface on bonded joints strength. Several combinations of materials, surface treatments and two types of adhesives has been designed and manufactured. Those properties were tested on the lap-joints. Samples were made according to the standard ASTM D5868. The materials used were steel S355, aluminium alloy EN AW 7075 T6, carbon fibre laminate and glass fibre laminate. The surface treatments used were: Sandblasted, Mechanically roughened, Anodised, Cataphoretically painted and No-surface treatment. The experimental tests of test specimens were done on the Zwick/Roell Z050 machine. Suitable combinations of material, adhesives and surface treatments were selected based on testing.
This work was focused on the investigation of the mechanical properties of the ACM87 composite when subjected to a large strain. Simple tension, simple shear, simple compression, and volumetric compression tests were performed using a universal testing machine. Various strain rates were used. The material data necessary for the identification of the parameters of a finite-strain viscoelastic constitutive model, such as the Bergstrom-Boyce model, were obtained. Keywords: cork, rubber, particle composite, Bergstrom-Boyce model, viscoelastic, large strain Delo je usmerjeno v preiskavo mehanskih lastnosti kompozita ACM87, ki je bil izpostavljen veliki obremenitvi. Na univerzalnem preizku{evalnem stroju so bili izvr{eni natezni, stri`ni, tla~ni in volumetri~ni tla~ni preizkusi. Uporabljene so bile razli~ne hitrosti obremenjevanja. Dobljeni so bili podatki o materialu, ki so potrebni za postavitev parametrov konstitutivnega viskoelasti~nega modela kon~ne obremenitve, kot je Bergstrom-Boycev model. Klju~ne besede: pluta, guma, kompozitni delec, Bergstrom-Boycev model, viskoelasti~nost, velika obremenitev
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.