REDUCTION OF STRESS CONCENTRATION
This work aims at understanding the effect of a radially heterogeneous layer around the hole in a homogeneous plate on the stress concentration factor. The problem concerns a single hole in a plate under different far-field in-plane loading conditions. By assuming a radial power law variation of Young’s modulus and constant value for Poisson’s ratio, the governing differential equations for plane stress conditions, and general in-plane loading conditions are studied. The elastic solutions are obtained in closed form and, in order to describe localized interface damage between the ring and the plate, two different interface conditions (perfectly bonded and frictionless contact) are studied. The formulae for the stress concentration factors are explicitly given for uniaxial, biaxial and shear in-plane loading conditions and comparisons with interface hoop stress values are performed. The solutions are investigated to understand the role played by the geometric and graded constitutive parameters. The results are validated with numerical finite element simulations in which some simplified hypotheses assumed in the analytical model, are relaxed to explore the range of validity of the elastic solution presented. In this way the results obtained are useful in tailoring the parameters for specific applications.
What are the Methods of Reducing Stress Concentration?
July 15, 2018 by Sundar Dannana Leave a Comment
We have discussed how the stress concentration effect the different cross-section mechanical components. Due to the irregular stress distribution, stress concentration increases and let the component failure. So how we can reduce the stress concentration? There are few methods of reducing stress concentration
Methods of reducing stress concentration
Before getting into the topic we have to understand what is the stress concentration and why it occurs.
Stress concentration occurs due to the irregular stress distribution. this irregular stress distribution occurs due to the different cross-sections, the presence of notches or holes, keyways, scratches.
There are a few methods that will reduce the stress concentration. These methods will not eliminate the complete stress concentration completely, but they can reduce the concentration to some extent.
Following are the different design possibilities of the same component with the stress flow line shown within the body.
As you can see the stress flow lines are more even in the slant edged, filleted, notched/grooved design. but in the case of sharp corners, it has more irregular stress flow lines causes the more stress concentration in the member. since it is not a preferred design.
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