Effective Restraint Intensities of a Slit in a Thick Finite Plate
1983 Volume 52 Issue 2 Pages 104-109
Details
1983 Volume 52 Issue 2 Pages 104-109
In this paper, a series of elastic analysis was conducted on the restraint intensity of a rectangular plate with a slit, changing only the plate thickness (keeping the throat thickness constant) and the distance from the center of plate thickness to that of throat thickness. Two -types of loading conditions were used for the above analysis, which were (1) application of uniformly distributed loads along the slit and (2) imposition of uniform displacement, instead.
The main results are as follows.
1) If the ratio of the plate thickness to the throat thickness, h/hw is approximately smaller than 3.5, it may be considered that the plate thickness is entirely effective regardless of the type of groove. On the other hand, if the ratio is greater than the above (for thicker plate thickness), the restraint intensity is not in a simple proportion to its plate thickness, and converges to a certain limit. An expression of the correction factor r/ for the effectiveness of plate thickness is proposed.
2) If the first weld is laid deviated from the center of the plate thickness, the out-of-plane bending deformation is produced according to the magnitude of the eccentricity and the effective restraint intensity at the center of the plate thickness decreases. However, within the range of eccentricity e=h'/(h/2)= 2h'/h<0.4 (h' is the distance from the center of plate thickness to that of throat thickness), the influence of the eccentricity can be neglected. An expression of the correction factor η' for the effect of eccentricity is formulated.
3) If the one side angle of the practical groove is within 45 degrees, the influence of the groove form can be disregarded.
4) As very accurate correction factors η and η' were obtained, the effective restraint intensity in a slit weld joint of a finite rectangular thick plate can be calculated simply by multiplying these correction factors to the two dimensional restraint intensity on which the thickness of the base plate is entirely effective. Consequently, the effective restraint intensity can be obtained simply without performing three dimensional elastic analysis which requires a huge amount of computing time.
