Experimental methods of evaluating the edge effect ? review

Polyakov, V. А.; Perov, Yu. Yu.

doi:10.1007/bf00616272

Mech Compos Mater

1989

DOI: 10.1007/bf00616272

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Experimental methods of evaluating the edge effect ? review

V. А. Polyakov

Yu. Yu. Perov

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Cited by 5 publications

(2 citation statements)

References 34 publications

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“…It is pointed out [12] that experimental investigation of edge effect is rather complicated problem. Even though the methods have considerable shortcomings, they are indispensable at the stage of checking the applicability of various computational models.…”

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confidence: 98%

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Reduction of Edge Effect in the Adhesive Joint of Pyroceramics

et al. 2005

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It has been shown that the stress concentration at the joint edges increases with rigidity of adhesive joints of pyroceramics. In view of the fact that the traditional methods are unsuitable for the reduction of stresses at the edges of joints of pyroceramics, we propose a new approach, which ensures reduction of the stress concentration in the edge region. The approach is based on the choice of a law of adhesion interlayer elastic modulus variation which would be a "mirror reflection" of the stress distribution function. The variation of elastic modulus makes it possible to maintain the joint rigidity at the level that is ensured by the constant elastic modulus of the interlayer. A model experiment performed confirms the proposed approach to be effective. Introduction.In recent years, adhesive joints of glass, pyroceramics and ceramics in various combinations with metals have been finding increasing use. The class of glueless joints of pyroceramics produced by means of a thin interlayer of adhesion-active metals shows promise [1]. Such joints are produced by the diffusion sintering technique.Joint edges and tips present great difficulties in the design and production of all types of adhesive joints. The results of tests showed that edge delamination reduces the effective rigidity of specimen and its ultimate strength. However, the information about the investigation of edge effects in diffusion joints is very limited [2].The purpose of this work was to reduce the edge effect in an adhesive joint of pyroceramics by using an interlayer with variable elastic modulus without decrease in the overall rigidity of the joint. The elastic modulus value decreases only in the edge effect region.The edge region of adhesive joint determines the change from local stress concentration to uniform stress distribution at a sufficient distance from the edge. The effects caused by large stress gradients on the lateral face of adhesive joint are called edge effects. High interlaminar normal and shear stresses may be responsible for fractures by delamination under relatively low applied loads, which are much lower than the ultimate loads for the materials to be joined. Therefore, edge delamination is one of the most common fracture modes of composite structures in practice. The dendency for increasing the rigidity of the adhesive joint of pyroceramics conditions increase in edge stress raisers. In the final analysis, it is edge effects that determine the strength and load -carrying ability of adhesive joint.The fact that there are no sufficiently reliable methods of reducing edge effect restrains the development and use of adhesive joints in modern machine building and instrument manufacture.The presence of stress concentration in the edge region is so substantial that the necessity arises of developing methods of rational design and search for constructive ways of reducing edge stresses.Most both computational and experimental works on evaluating edge effects are devoted to laminar composites. Computing experiments at early stages of...

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“…The beveled edge method is the best known method for various joints [14]. For laminates, recommendations for reducing edge effects by the inversion of alternation of plies, their thicknesses and combination of elastic characteristics are common [3,12,15].…”

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confidence: 99%

Reduction of Edge Effect in the Adhesive Joint of Pyroceramics

et al. 2005

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Calculation of edge stresses in multilayer composite materials

Lur'e¹

1994

Mech Compos Mater

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Prevention of edge delamination in laminar plastics

Perov¹

1991

Mech Compos Mater

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Experimental methods of evaluating the edge effect ? review

Cited by 5 publications

References 34 publications

Reduction of Edge Effect in the Adhesive Joint of Pyroceramics

Reduction of Edge Effect in the Adhesive Joint of Pyroceramics

Calculation of edge stresses in multilayer composite materials

Prevention of edge delamination in laminar plastics

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