Numerical investigation on the position of holes for reducing stress concentration in composite plates with bolted and riveted joints

The composite materials are widely used nowadays as major parts of structures in many industries like aerospace, marine, automobile, space vehicles and also for the repair and replacement of civil infrastructures. Stresses are vital parameters considered in the design of structures. Any irregularities in shape, materials, or the presence of cut-outs create localized stress concentration and reduce the capacity of the material to take loads. The anisotropic behaviour of composite structures also makes the analysis more complex. Shear loading often exists in the engineering practices such as in aerospace due to heavy aerodynamic loads. So in the present study the effects of different parameters like layup sequences, number of plies, proximity of cut-outs, shapes and arrangements of cut-outs under in-plane shear loading on the glass fibre reinforced polymer (GFRP) plate with multiple cut-outs are studied using ABAQUS. The results from the study show that all the parameters considered for the study affects the stress concentration considerably. The observations are analysed then and the final conclusions are presented.

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Stress Analysis of the Skewed-Roller Slipping Clutch Based on Frictional Contact and Dynamic Equilibrium

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.86.850 ◽

2011 ◽

Vol 86 ◽

pp. 850-853 ◽

Cited By ~ 1

Author(s):

Ming Feng ◽

Guang Rong Yan

Keyword(s):

Stress Concentration ◽

Frictional Contact ◽

Power Transmission ◽

Dynamic Equilibrium ◽

Von Mises Stress ◽

Relative Rotation ◽

Profile Modification ◽

Roller Profile ◽

Von Mises ◽

Reducing Stress

As a novel power transmission component, the skewed–roller slipping clutch (SRSC) produces resisting torque depending on relative rotation and sliding between askew arranged cylindrical rollers and specially curved races. In this paper, the surface contact stress and von Mises stress between the rollers and the races are calculated and the effects of roller profile modification on reducing stress concentration are investigated under frictional contact and dynamic equilibrium of the rollers and races.

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The Use of Stress Reduces in suddenly Changed Section of Rounded Shafts

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.147.9 ◽

2011 ◽

Vol 147 ◽

pp. 9-13

Author(s):

S.R. Mohebpour ◽

Mohammad Vaghefi

Keyword(s):

Stress Concentration ◽

Numerical Optimization ◽

Optimization Approach ◽

Geometrical Shape ◽

New Concepts ◽

Concentration Factors ◽

Geometrical Change ◽

Stress Concentration Factors ◽

Reducing Stress ◽

Dangerous Section

Reducing stress concentration is mainly done by fillets. However, new concepts toward better material properties lead designers and engineers to use these materials in their design, still changing in geometrical shape of desired models can help us in reducing stress concentration factors. New devices, including fast computers, reliable numerical methods (FEM), and numerical optimization approach can bring special devices for better designing besides considering design limitations in special industries. In this paper we focus on geometrical change (rounded groove) in the sudden changed section of the rounded shaft to reduce stress concentration in the most dangerous section. By optimizing this proposed change in the geometry of shaft we reduce the stress, so using of fillets can be neglected in the future designs to prevent metallurgical and design limitations.

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