St. Tu et al., STRENGTH DESIGN AND LIFE ASSESSMENT OF WELDED STRUCTURES SUBJECTED TOHIGH-TEMPERATURE CREEP, International journal of pressure vessels and piping, 66(1-3), 1996, pp. 171-186
Premature failures of weldments have taken a large percentage among th
e failure cases of high temperature components. The accurate predictio
n of the high temperature creep behavior of welded components is hence
becoming increasingly important in order to realize an optimized desi
gn and management of a plant life. In the present paper, design and li
fe assessment procedure for welded structures at elevated temperature
is discussed. A concept of structural creep-rupture strength is propos
ed to define the weldment creep strength reduction factor. Multiaxial
effect is taken into account. A damage mechanics approach is introduce
d to study the life reduction and ductility reduction due to the prese
nce of a weld in structures at high temperature.