ISSN: 0090-3973
Page Count: 10

Stress Concentration Factor Formulas Useful for Any Dimensions of Shoulder Fillet in a Flat Test Specimen Under Tension and Bending
Noda, NA
Kyushu Institute of Technology,

Takase, Y
Kyushu Institute of Technology,

(Received 18 November 2002; accepted 14 January 2004)

Abstract

In this work stress concentration factors K^t for a flat bar with fillets are considered on the basis of exact solutions now available for special cases and accurate numerical results. Then, a convenient K^t formula useful for any dimensions of the fillet is proposed. The conclusions can be summarized as follows.

1. For the limiting cases of deep (d) and shallow (s) fillets, the body force method is used to calculate the K^t values. Then, the formulas are obtained as K^td and K^ts.

2. On the one hand, upon comparison of K^t and K^td, it is found that K^t is nearly equal to K^td if the fillet is deep or blunt.

3. On the other hand, if the fillet is sharp or shallow, K^t is controlled mainly by K^ts and the fillet depth.

4. The fillet shape is classified into several groups according to the fillet radius and fillet depth. Then, the least-squares method is applied for calculation of K^t/K^td and K^t/K^ts.

5. Finally, convenient formulas are proposed that are useful for any dimensions of fillet in a flat bar. The formulas give SCFs with less than about 1 % error in most cases for any dimensions of fillet under tension and bending.

Keywords:
stress concentration factor, shoulder fillet, flat bar, test specimen, tension, bending, body force method

Paper ID: JTE11799
DOI: 10.1520/JTE11799
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