(PC-1211) σ & ε Concentration ƒactor

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An excerpt from Stress and Strain Concentration Factor Evaluation Using the Equivalent Energy Concept, JAROSLAV POLÁK, Materials Science and Engineering, 61(1983)195-200

"SUMMARY
   The energy approach to local stress and strain evaluation in a notch in materials with a power law type of hardening curve is generalized. The formulae for relative stress and strain concentration factor evaluation using the generalized equivalent energy method, the Neuber method and the Hardrath-Ohman method are derived and the results are compared for low carbon steel …
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5. CONCLUSIONS
  (1) The generalized equivalent energy method yields stress and strain concentration factors dependent on the stress-strain relation of a particular metal and on the product of the nominal stress and theoretical stress concentration factor. The local stress and strain are obtained by a solution of an equation that is easy to program on a programmable calculator or a pocket computer.
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APPENDIX A
   The program in BASIC (for a Sharp PC 1211 pocket computer) used to calculate the relative stress and strain concentration factors ×σ & ×ε depending on σ using the equivalent energy method, the Neuber method and the Hardrath-Ohman method …
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