Download Mixed-Mode Crack Behavior (ASTM Special Technical by Keith John Miller and David L. McDowell, editors PDF
By Keith John Miller and David L. McDowell, editors
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Extra info for Mixed-Mode Crack Behavior (ASTM Special Technical Publication, 1359)
Example text
O FIG. A1--Mixed-mode ratios M~ characterizing the change in fracture mode. The data points correspond to the lowest applied M~ ratios still causing tensile crack growth in the mixed-mode experiments [17,19,20,27,36,52-55]. maximum tangential stress, and the 5~/5~ ratio were predicted from the mixed-mode HRR field. On the left side of Fig. A1 the fit curve decreases since higher Mode II components are usually needed to generate a shear crack in less tough materials. In this region there is, however, no unique relationship between a certain material and a Me-factor characterizing 9 9 StE 550 cruciform spec.
Apparently the combination of tensile and bending loading exerted a constraint of the plastic deformation ahead of the kinked crack which laid in between C(T) and M(T) specimens [15]. Increasing bending components (decreasing d~) increased constraint and therefore the gv Aa data points were shifted towards the C(T) R-curve (qb = 15~ in Fig. 3). The ~5 R-curve of the highly constrained C(T) specimens seems to be a conservative estimate of fracture resistance. 26 MIXED-MODECRACK BEHAVIOR 3 StE 550 ~ M(T) C(TS), W=9Omm ~o":6~oI B=4mm ~ 2-a~ t~ 0"67 ~ ~ .
Crack kinking could be neglected in the contained yielding solution, since it occurred after limit load was reached. The fully plastic part of the load displacement relation is assessed using the usual ETM power-law formalism. Because of the early initiation of stable cracks in the A12024-T3 specimen the Mode I contained yielding solution (Eq 4) was used in Fig. 12. The pre-crack length was projected in the plane perpendicular to the main loading axis. The stress intensity factor was then evaluated with the formula for Mode I cracked cruciform specimen [44].