Dynamic Stress Concentrations at Circular Holes in Struts

1965 ◽  
Vol 7 (1) ◽  
pp. 23-27 ◽  
Author(s):  
J. W. Dally ◽  
W. F. Halbleib
Keyword(s):  
Fringe Pattern ◽  
Dynamic Stress ◽  
Static Stress ◽  
Stress Concentrations ◽  
Circular Holes ◽  
The Difference ◽  
Dynamic Stress Concentrations

Dynamic stress concentrations were determined for a strut with a centrally located hole by employing photoelastic measurements. Single spark photography together with controlled repeated loadings on Columbia resin CR-39 models was utilized to obtain the dynamic fringe pattern. In general, it was found that the dynamic stress concentrations differed significantly from the static stress concentrations. The difference depended upon the geometry of the model and the location at the boundary of the hole.

Diffraction of Plane Compressional Waves by an Array of Nanosized Cylindrical Holes

2010 ◽  
Vol 78 (2) ◽  
Author(s):  
Q. F. Zhang ◽  
G. F. Wang ◽  
P. Schiavone
Keyword(s):  
Surface Energy ◽  
Dynamic Stress ◽  
Surface Elasticity ◽  
Expansion Method ◽  
Stress Concentrations ◽  
Compressional Waves ◽  
Circular Holes ◽  
Cylindrical Holes ◽  
Effect Of Surface ◽  
Dynamic Stress Concentrations

When the radius of a hole reduces to nanometers, the influence of surface energy becomes prominent in its mechanical behavior. In the present paper, we consider the diffraction of plane compressional waves by an array of nanosized circular holes in an elastic medium. The effect of surface energy is taken into account through surface elasticity theory. Using the wave expansion method, we derive the corresponding elastic diffraction fields. Dynamic stress concentrations around the holes and the scattering cross section are calculated to address the surface effects on the diffraction phenomena.

Experimental and Analytical Investigation of Dynamic Stress Concentrations at a Circular Hole

1974 ◽  
Vol 41 (2) ◽  
pp. 417-422 ◽  
Author(s):  
S.-J. Fang ◽  
J. H. Hemann ◽  
J. D. Achenbach
Keyword(s):  
Circular Hole ◽  
Hoop Stress ◽  
Dynamic Stress ◽  
Pressure Pulse ◽  
Analytical Investigation ◽  
Stress Concentrations ◽  
Triangular Shape ◽  
Hoop Stresses ◽  
Dynamic Stress Concentrations ◽  
Good Agreement

The hoop stresses which are generated at the circumference of a circular hole in a large plate when a pressure wave is diffracted, were measured by photoelastic methods. A plane pressure pulse of short duration and approximately triangular shape was generated by the detonation of a strip-explosive over one edge of the plate. Measurements were carried out for three values of the ratio, 2a/Λ, of the diameter of the hole to the length of the stress pulse. Dimensionless hoop stresses are plotted versus the time after detonation and versus the ratio 2a/Λ. The dimensionless hoop stress decreases as 2a/Λ increases. The measured values show good agreement with analytical computations.

Sign in / Sign up

Export Citation Format

Share Document