Issue 41

F. Berto et alii, Frattura ed Integrità Strutturale, 41 (2017) 260-268; DOI: 10.3221/IGF-ESIS.41.35

W

*T,K,K II (  10 3 )

FE W (  10 3 ) W HOT

(  10 3 ) 



R 0 =0.28mm,  =0 mm t=1mm

I

(MJ/m 3 )

(MJ/m 3 )

(%)

(MJ/m 3 )

(%) 25.0 25.0

d/t=0.5

1.412 1.208 1.181

1.453 1.214 1.193

2.9 0.5 1.0

1.765 1.509 1.443

1 3

22.2 Table 2 . Mean values of the strain energy density over the control volumes for welded lap joints, with F/(t  1)=10 MPa; values based on T* determined on the ligament, close to the point of singularity, r  0.03 mm

1000

Theoretical solution considering the parameters a 1 ,…, a 7 Theoretical solution considering the parameters K I , K II and T-stress

t=1mm d/t=1  = 0° and 180°

100

10

FE results  rr

(  = 180°)

(  = 0°)

1 Stress components [MPa]  

(  = 0°) (  = 0°)

 rr

 r 

0

r [mm]

0.001

0.010

0.100

1.000

Figure 2 : Stress field along the ligament line for the case d/t=1 and t=1 mm.

1000

t=1mm d/t=1  = +90°

FE results

Theoretical solution considering the parameters a 1 ,…, a 7 Theoretical solution considering the parameters K I , K II and T-stress

   rr  r 

100

range of valitidy of K I , K II , T-stress based solution

10

Stress components [MPa]

1

0.001

0.010

0.100

1.000

r [mm]

Figure 3 : Stress field along the direction  =90° for the case d/t=1.

266