Page 286 - Handbook of Materials Failure Analysis

282 CHAPTER 12 A nonlocal damage-mechanics-based approach

Summary of Different Parameters Studied for Their Effect on Fracture Behavior in Upper Shelf and DBTT Regime
Details, Section
For Refer 6.1 6.2 6.3 6.4 6.5 6.6

of and and scatter in higher. °Cin
J-R resistance lower CT of full full specimen 20
inferior independent fracture SEB thickness capability resistance for boundary both as well crack-tip is growth to

drop, size are and 1T for different for result as low crack 100

load mesh results smaller for deep-cracked specimen compared specimen With carrying fracture are symmetric values shallow-cracked to from
Effects faster reduced capacity capacity CT. load however, Results with Same due stable increases

of model: model: carrying shallow-cracked carrying 1T to the inferior model: model model: models toughness the for regime the °C, regime
Summary Local with curve Nonlocal size mesh Load to Load compared specimen, increases, becomes Local FE half condition Nonlocal FE half Fracture high are DBTT the constraint 20 At value This DBTT the

and Used 2T CT,

of Specimens Geometries Tests IT CT 1T CT, full FE model model
Types the in SEB IT SEB IT SEB, IT 4T CT, half vs. SEB IT CT 1T

Fracture Upper region region region region

on in Shelf/DBTT shelf shelf shelf shelf regime regime
Effect Behavior Regime Upper Upper Upper Upper DBTT DBTT

0.2, ratios and ratios crack cleavage 60
Studied (0.1, a/W 0.522 geometry constraint condition a/W 0.522 stable 100,

Table 12.2 Parameter size mesh FE mm) 0.4 and depth, Crack and 0.13 of Specimen crack-tip Boundary depth, Crack and 0.13 of of Extent before growth at fracture °C 20 and