RESEARCH ON THE DISTRIBUTION OF TENSION IN NOTCHED CONSTRUCTION PARTS
Abstract
The influence of various factors (notch-radius, depth of notch, notch-angle, material) on the stress concentration of notched flat bars was investigated theoretically and experimentally by electrical strain gages and by means of the photoelastic stress-coat method. The elastic stress-concentration factors (SCF), and the stress distribution over the minimum cross section were evaluated theoretically and experimentally for the elastic range. For the plastic range a method was developed that considered the real stress-strain curve of the material. This method allows the calculation of the stress concentration factor (which is known to decrease with increasing load) in dependence of the nominal stress in tension and bending. The method was applied to evaluate the diagrams for 4 different materials (steel St. 00.12, St 00.21, pure Al, and Al alloy, Velodur), which show the SCF vs the nominal stress. Numerous tests with notched specimens of these materials confirm the theory. In these tests in the plastic range the strain distribution over the minimum cross section was also determined. Further theoretical investigations concern the treatment of V-shaped notches and the influence of the notch-angle in pure shear. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1961
- Accession Number
- AD0262132
Entities
People
- H. Neuber