While initiation occurs in both specimens at identical local J and local h the different resistance curve slopes correspond to differences in the average h in both specimens. With that information a simple linear relationship between average h and the slope of the resistance curve was postulated. ...
As already mentioned above, constraint (or degree of stress triaxiality) has a large effect on the resistance of material to crack growth and hence on fracture toughness and R-curve behavior which causes the transferability problem in fracture mechanics. Three approaches are being pursued as possible...
numerical analysis/ macroscopic force-deflection curve characteristicsfracture behaviorCT specimen geometryABAQUS v 6.10user-defined elementsstress state explicitlyThis article reports the results of numerical implementation of a recently proposed versatile cohesive law (TCZM) that incorporates triaxiality of the...
As an additional confirmation of the obtained stress–strain curve for the high strain-rate loading, the experimental results were interpreted directly using a similar procedure to the one which is applied for SCS specimens impacted in a SHPB apparatus. The procedure requires a transformation of the...
Ductile failure of X-100 pipeline steel is studied.Experiments are done to extract Hill plasticity parameters and hardening curve.Experiments and FE analysis are done on round and flat notched specimens.Failure strain is sensitive to triaxiality and is not sensitive to Lode angle.A correlation for ...
A two-parameter fracture mechanics approach for tensile mode crack tip states in which the fracture toughness and the resistance curve depend on Q, i. J( Q) and J(Δa, Q), is proposed. 展开 关键词: Theoretical or Mathematical/ crack-edge stress field analysis yield stress/ crack-tip ...
The curves of behaviour deducted of these tests show that the yield stress (defined at the maximal strength point on the conventional stress鈥攕train curve) of the material increases with the reduction of the notch radii. This tendency is due to the fact that the triaxial stress increases with...
Overall, the specimen-level stress–strain curve from the model matches the experimental results. Note that, in the model, no attempt was made to predict fracture or the accumulation of damage. The markers in Fig. 12a indicate the average strain-to-fracture from the experiments and error bars...
curve, damage evolution, fracture strain locus and Fracture Forming Limit Diagram (FFLD). The mathematical formulations of the model and its numerical algorithm are presented in detail. In order to show the capability of the model, the model is implemented as a user-defined subroutine VUMAT in ...
A two-parameter fracture mechanics approach for tensile mode crack tip states in which the fracture toughness and the resistance curve depend on Q, i. JC(Q) and JR(Δa, Q), is proposed. 展开 DOI: 10.1016/0022-5096(91)90049-T