# Test specimen of circular cross section in tension with a U-shaped groove

## Values for calculation

## Calculation

### Coefficient $ C_1 $

### Coefficient $ C_2 $

### Coefficient $ C_3 $

### Stress concentration factor with the nominal stress based on net area

### Nominal or reference normal stress

### Maximum normal stress

### Normal stress

### Stress concentration factor with the nominal stress based on gross area

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