wacee
Mechanical
- Jun 13, 2024
- 4
Hello everyone,
I'm modeling a weld on COMSOL between dissimilar metals to assess the thermal stress (at low temperature so dissimilar contraction of the metals). I have some hot spots because of the geometry and wanted to used the hot spot stress method to interpolate the stress at the intersection between the base metal and the weld.
I have the following profile near the weld (two peaks for the two extremities of the weld):
First, something I don't understand is the downward peak that even goes into compressive values. I thought the longitudinal stress would only be in tension for this case ?
Second, the hot spot stress method in PD 5500 seems appropriate for the upward peaks but not for the downward peak. Do you have any tips on how to approach the analysis of this result ?
I have done some analytical calculations and compared the value of the longitudinal stress far from the weld. The model seems correct in that way.
Thank you for your insight !
I'm modeling a weld on COMSOL between dissimilar metals to assess the thermal stress (at low temperature so dissimilar contraction of the metals). I have some hot spots because of the geometry and wanted to used the hot spot stress method to interpolate the stress at the intersection between the base metal and the weld.
I have the following profile near the weld (two peaks for the two extremities of the weld):
First, something I don't understand is the downward peak that even goes into compressive values. I thought the longitudinal stress would only be in tension for this case ?
Second, the hot spot stress method in PD 5500 seems appropriate for the upward peaks but not for the downward peak. Do you have any tips on how to approach the analysis of this result ?
I have done some analytical calculations and compared the value of the longitudinal stress far from the weld. The model seems correct in that way.
Thank you for your insight !
