This report is the final technical report of the fracture
mechanics part of the Reliability of Reactor Materials
Programme, which was carried out at the Technical
Research Centre of Finland (VTT) through the years 1981
to 1983. Research and development work was carried out in
five major areas, viz. statistical treatment and
modelling of cleavage fracture, crack arrest, ductile
comparison of numerical and experimental elastic-plastic
In the area of cleavage fracture the critical variables
affecting the fracture of steels are considered in the
frames of a statistical model, so called WST-model.
Comparison of fracture toughness values predicted by the
model and corresponding experimental values shows
excellent agreement for a variety of micro-structures.
Different possibilities for using the model are
The development work in the area of crack arrest testing
was concentrated in the crack starter properties, test
arrangement and computer control.
A computerized elastic-plastic fracture testing method
with a variety of test specimen geometries in a large
temperature range was developed for a routine stage.
Ductile fracture characteristics of reactor pressure
vessel steel A533B and comparable weld material are
The features of a new, patented instrumented impact
tester are described. Experimental and theoretical
comparisons between the new and conventional testers
indicated clearly the improvements achieved with the new
A comparison of numerical and experimental
elastic-plastic fracture mechanics capabilities at VTT
was carried out. The comparison consisted of
two-dimensional linear elastic as well as elastic-plastic
finite element analysis of four specimen geometries and
equivalent experimental tests.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||155|
|Publication status||Published - 1986|
|MoE publication type||D4 Published development or research report or study|
|Series||Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports|
- nuclear reactor materials
- fracture properties