A Simple Specimen for the Determination of Elastic-Plastic Fracture Mechanics Parameters on Hollow Cylinders

1989 ◽  
Vol 111 (3) ◽  
pp. 252-258
Author(s):  
E. Roos
Keyword(s):  
Fracture Mechanics ◽  
Linear Elastic ◽  
Arc Shape ◽  
Growth Laws ◽  
Resistance Curves ◽  
Hollow Cylinders ◽  
Elastic Fracture ◽  
Mechanics Characteristics ◽  
Crack Resistance Curves

Functions have been derived for a linear-elastic fracture mechanics specimen of an arc-shape, which because of this shape, can be removed relatively easily from pipes or cylindrical components. These specimens can be used for determining crack resistance curves using the J-integral so that, even for thinner components, it is relatively simple to obtain crack growth laws with crack propagation direction over the wall thickness. The ductile fracture mechanics characteristics determined on arc-shaped specimens corresponds well with the values determined on side-grooved CT-25 specimens.

scholarly journals A J Integral Analysis for the Compact Specimen, Considering Axial Force as Well as Bending Effects

1974 ◽  
Vol 96 (4) ◽  
pp. 286-292 ◽  
Author(s):  
J. G. Merkle ◽  
H. T. Corten
Keyword(s):  
Fracture Mechanics ◽  
Combined Loading ◽  
Compact Specimen ◽  
J Integral ◽  
Plastic Range ◽  
Integral Analysis ◽  
Linear Elastic ◽  
Specimen Test ◽  
Elastic Fracture

An important fracture mechanics problem is the determination of fracture toughness values with small specimens that fail after yielding. The J integral has an explicit meaning in terms of notch tip conditions in the plastic range and can be calculated from a single specimen test data. In this paper, an improved J integral analysis is developed for the compact specimen by considering the combined loading that exists on the net section. The analysis agrees with linear elastic fracture mechanics in the elastic range and gives a result close to that given by the equivalent energy method in the plastic range.

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