Analysis of Effect of Crack in Composite Beam on Slip of Shear Connectors

2013 ◽  
Vol 405-408 ◽  
pp. 925-928
Author(s):  
Wan Heng He ◽  
Qing Hua Gu ◽  
Ying Chen Ma ◽  
Xin Hua Ni ◽  
Xiang Feng Meng
Keyword(s):  
Mechanical Properties ◽  
Full Advantage ◽  
Brittle Material ◽  
Composite Beam ◽  
Brittle Materials ◽  
Second Order ◽  
Ductile Materials ◽  
Shear Connectors ◽  
Ultimate Moment

Composite beam takes full advantage of mechanical properties of brittle and ductile materials elements. The key point is to rely on the shear connectors ensure overall coordination of composite beam, so as to achieve the effect of flexural component. The crack in composite beam caused by brittle materials elements is not negligible. We obtained the slip of shear connectors with the second order precision under the conditions that there are cracks in the brittle material elements, and the ultimate moment is obtained too.

The Increasing of Interface Slip and its Effect on Composite Beams when there Are Cracks in Brittle Material Element

2012 ◽  
Vol 204-208 ◽  
pp. 4643-4646
Author(s):  
Qing Hua Gu ◽  
Xin Hua Ni ◽  
Ying Chen Ma ◽  
Zhao Gang Cheng
Keyword(s):  
Cross Section ◽  
Brittle Material ◽  
Composite Beam ◽  
Shear Force ◽  
Ductile Material ◽  
Shear Connector ◽  
Shear Connectors ◽  
Material Element ◽  
Interface Slip ◽  
Ultimate Moment

The composite beam is composed of the brittle material element and ductile material element (for example: concrete and steel), and with shear connectors it decreases the slip between the brittle material element and ductile material element, and ensures the coordination and integrity of the cross section. When there are cracks in brittle material element in use, it will increase interface slip. In this paper, we assume that the brittle material has cracks, and calculate the slip of shear connectors. Letting the end slip equal to the ultimate slip of shear connector, the shear force and ultimate moment of composite beam is gotten.

Ultimate Load of Composite Beam Based on Effect for Cracks in the Brittle Material on Slip of Shear Connectors

2010 ◽  
Vol 163-167 ◽  
pp. 1901-1904
Author(s):  
Qiong Xi Liu
Keyword(s):  
Brittle Material ◽  
Composite Beam ◽  
Ultimate Load ◽  
Flexural Rigidity ◽  
Ductile Material ◽  
Total Change ◽  
Shear Connectors ◽  
Material Element ◽  
Rigidity Coefficient

In engineering, the excessive slip of shear connectors will arouse the failure of the beams, and cracks in the brittle material element can increase the slip. In this paper, composite beam is composed of the brittle and ductile material elements and there are cracks in the brittle material element. Based on the relation between the slip strain and flexural rigidity, defining rigidity coefficient as there are cracks in the brittle material element, the total change in the slip strain at a given section due to cracking of the brittle material is obtained. The end slip that incorporates the effects of the brittle material cracking is calculated by integrating the slip strain. Letting the end slip equaled to the ultimate slip of shear connectors, the ultimate load formation of composite beam is gotten.

STRENGTH CAPACITY OF BOLTED SHEAR CONNECTORS WITH COLD-FORMED STEEL SECTION INTEGRATED AS COMPOSITE BEAM IN SELF-COMPACTING CONCRETE

2015 ◽  
Vol 77 (16) ◽  
Author(s):  
Mustapha Muhammad Lawan ◽  
Mahmood Md. Tahir
Keyword(s):  
Composite Beam ◽  
Ultimate Load ◽  
Technical Information ◽  
Bending Test ◽  
Self Compacting Concrete ◽  
Shear Connectors ◽  
Composite Systems ◽  
Strength Capacity ◽  
Cold Formed Steel ◽  
Ultimate Moment

The use of composite systems comprising of concrete and hot-rolled steel (HRS) sections is well established as observed by extensive rules and requirements for their design as prescribed in current design codes. There is, however, few technical information available about the use of composite systems that incorporates the use of light gauge steel sections, despite the potentials of the system in residential and light industrial constructions. Therefore, this study investigates the strength capacity of bolted shear connectors with cold-formed steel (CFS) section integrated as composite beam in self-compacting concrete. In this paper, four composite beam specimens of dimensions (4500 mm x 1500 mm x 75 mm) with bolted shear connectors of M12 and M14 of grade 8.8 installed on the upper flanges of the coupled back-to-back CFS I-section with longitudinal spacing’s of 250 mm and 300 mm centers and spaced 75 mm laterally were fabricated, cast and tested to failure using four-point bending test. Shear connector size and the longitudinal spacing were the varied parameters, and their influence was investigated on the ultimate load and ultimate moment capacities. The results showed that, the ultimate load and ultimate moment capacities were both influenced remarkably by the studied parameters. However, results of theoretical analysis, revealed good agreement between the experimental and the theoretical results. This shows that, the plastic analysis results for the ultimate moment capacity of the composite beams can be estimated efficiently by using the constitutive laws as prescribed by Eurocodes.

scholarly journals Dynamic mechanical behaviors of epoxy resin/hollow polymeric microsphere composite foams under forced non-resonance and forced resonance

2021 ◽  
Vol 30 ◽  
pp. 263498332110081
Author(s):  
Rui Li ◽  
Guisen Fan ◽  
Xiao Ouyang ◽  
Guojun Wang ◽  
Hao Wei
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Second Order ◽  
Polymer Microspheres ◽  
Hollow Glass Microsphere ◽  
Dynamic Mechanical ◽  
First Order ◽  
Composite Foams ◽  
Prepared Composite ◽  
Loss Factors

Composite foams with 10–50 vol% hollow polymeric microspheres were prepared using bisphenol A epoxy resin and polyetheramine curing agent as the matrix. The results demonstrated that the density, hardness, and static mechanical properties of the epoxy resin/hollow polymer microsphere composite foams, as well as their dynamic mechanical properties under forced non-resonance, were similar to those of polymer/hollow glass microsphere composite foams. At 25°C and under 1–100 Hz forced resonance, the first-order and second-order resonance frequencies of the composite foams shifted to the low-frequency region as the volume fraction of hollow polymer microspheres increased. Meanwhile, the first-order and second-order loss factors of the as-prepared composite foams were improved by 41.7% and 103.3%, respectively, compared with the pure epoxy resin. Additionally, the first-order and second-order loss factors of the as-prepared composite foams reached a maximum at 40 vol% and 30 vol% hollow polymer microspheres, respectively. This research helps us to expand the application range of composite foam materials in damping research.

Schleifen von WC-Co-Hartmetallen*/Grinding of Cemented Carbides (WC-Co)

2016 ◽  
Vol 106 (06) ◽  
pp. 374-379
Author(s):  
C. Wirtz ◽  
F. Vits ◽  
P. Mattfeld ◽  
F. Prof. Klocke
Keyword(s):  
Brittle Material ◽  
Brittle Materials ◽  
Material Behavior ◽  
Ductile Material ◽  
Cemented Carbides ◽  
Multi Phase

Beim Schleifen mehrphasiger Werkstoffe mit sprödhartem Charakter, beispielsweise Hartmetall, wurde ein Übergang von sprödhartem zu duktilem Werkstoffverhalten nachgewiesen. Der Fachartikel stellt eine neu entwickelte Methodik zur systematischen Analyse des Zerspanverhaltens – im Speziellen den Übergang von vorwiegend duktilem zu überwiegend sprödhartem Zerspanverhalten – für Hartmetalle vor.   In grinding of multi-phase, brittle materials, e. g. cemented carbides, a transition from predominantly brittle to predominantly ductile material behavior has been proven scientifically. This paper presents a newly developed methodology to analyze the material behavior of cemented carbides, in particular the transition from ductile to brittle material behavior.

scholarly journals Дестабилизация внедрения высокоскоростной струи в хрупких материалах

2019 ◽  
Vol 89 (5) ◽  
pp. 685
Author(s):  
Б.В. Румянцев
Keyword(s):  
Brittle Material ◽  
High Speed ◽  
Bending Strength ◽  
Brittle Materials ◽  
Absorption Efficiency ◽  
Hydrodynamic Approximation ◽  
Metal Jet

AbstractThe results of penetration of a high-speed metal jet (with a velocity of 3–7 km/s) into brittle materials (ceramics and glass) have been analyzed. The data on jet destabilization as a result of the response of the brittle material to the high-speed penetration are presented. The generalized dependence of the high-speed jet absorption efficiency on the bending strength of the brittle material has been constructed in the hydrodynamic approximation.

Fundamental Analysis of the New Version of the New Proposed Fracture Theory

2005 ◽  
Vol 502 ◽  
pp. 87-94 ◽  
Author(s):  
Refat Ahmed Elshikhy
Keyword(s):  
Physical Meaning ◽  
Brittle Materials ◽  
Current Theory ◽  
Fundamental Analysis ◽  
Ductile Materials ◽  
Detailed Explanation ◽  
New Concepts ◽  
Unified View ◽  
Fracture Theory ◽  
Cracking Process

New version of new proposed fracture theory called N-N was introduced as concepts and hypotheses. In this research analytical discussions and applications in addition to detailed explanation of physical meaning and conceptual formation of is introduced. The current theory depends mainly on energy approach in LEFM for isotropic brittle materials and can be applied for ductile materials and composites regarding their different properties. This theory represents an extension of the continued efforts to obtain a unified view for all ideas and proposals of the majority of the researchers in the field of development of the fracture theories to predict the mechanism and mechanical aspects of cracking process. Fundamental new concepts and analytical hypotheses are introduced.

Sign in / Sign up

Export Citation Format

Share Document