Determination of fracture parameters (K Ic s and CTODc) of plain concrete using three-point bend tests

Short surface cracks were generated by Vickers indentation on the polished surface of alumina and different zirconia toughened alumina (ZTA) specimens, and their morphology was studied by serial sectioning. These cracks were grown in three-point bend tests under stepwise loading, and variation of toughness with crack extension was plotted to graphically separate the contributions from residual stress intensity and applied stress intensity factors. The plateau toughness determined from the intercept height of the crack extension plots exhibited an upward trend with zirconia content up to 15 vol % ZrO2 addition in the composition, which was proportional to the fraction of transformable tetragonal grains contributing to transformation toughening.

FMC3 Determination of fracture parameters and CTOD ) of plain concrete using point bends tests

RILEM Technical Recommendations for the testing and use of construction materials ◽

10.1201/9781482271362-65 ◽

1994 ◽

pp. 287-296

Keyword(s):

Plain Concrete ◽

Fracture Parameters

Determination of the fracture energy of mortar and concrete by means of three-point bend tests on notched beams

Matériaux et Constructions ◽

10.1007/bf02472918 ◽

1985 ◽

Vol 18 (4) ◽

pp. 287-290 ◽

Cited By ~ 283

Keyword(s):

Fracture Energy ◽

Bend Tests ◽

Point Bend

Determination of fracture parameters of asphalt mixes by the repeated indirect tensile test

Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials ◽

10.1617/2912143772.048 ◽

2003 ◽

Cited By ~ 1

Author(s):

F. Martinez

Keyword(s):

Tensile Test ◽

Asphalt Mixes ◽

Indirect Tensile Test ◽

Fracture Parameters ◽

Indirect Tensile

Acoustic Emission Studies of Alumina-13% Titania Free-Standing Forms during Four-Point Bend Tests

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.1997.tb03130.x ◽

2005 ◽

Vol 80 (9) ◽

pp. 2382-2394 ◽

Cited By ~ 14

Author(s):

Chung-Kwei Lin ◽

Christopher C. Berndt ◽

Sang-Ha Leigh ◽

Kenji Murakami

Keyword(s):

Acoustic Emission ◽

Free Standing ◽

Bend Tests ◽

Point Bend ◽

Emission Studies

Determination of Fracture Parameters

Plasticity and Fracture - Solid Mechanics and Its Applications ◽

10.1007/978-3-319-62752-6_7 ◽

2017 ◽

pp. 109-126

Author(s):

Wolfgang Brocks

Keyword(s):

Fracture Parameters

Effects of Dynamic Strain-Aging and Cyclic Loading on Fracture Behavior of Ferritic Steels

10th International Conference on Nuclear Engineering, Volume 1 ◽

10.1115/icone10-22151 ◽

2002 ◽

Author(s):

K. Linga Murty ◽

Chang-Sung Seok

Keyword(s):

Fracture Toughness ◽

Cyclic Loading ◽

Strain Aging ◽

Crack Tip ◽

Load Ratio ◽

Seismic Loading ◽

Dynamic Strain ◽

Ferritic Steels ◽

Bend Tests ◽

Point Bend

Ferritic steels commonly used for pressure vessels and reactor supports in light water reactors (LWRs) exhibit dynamic strain aging (DSA) resulting in decreased ductility and toughness. In addition, recent work indicated decreased toughness during reverse-cyclic loading that has implications on reliability of these structures under seismic loading conditions. We summarize some of our recent work on these aspects along with synergistic effects, of interstitial impurity atoms (IIAs) and radiation induced point defects, that result in interesting beneficial effects of radiation exposure at appropriate temperature and strain-rate conditions. Radiation-defect interactions were investigated on pure iron, Si-killed mild steel, A533B, A516, A588 and other reactor support and vessel steels. In all cases, DSA is seen to result in decreased ductility accompanied by increased work-hardening parameter. In addition to mechanical property tests, fracture toughness is investigated on both A533B and A516 steels. While dips in fracture toughness are observed in A533B steel in the DSA region, A516 steel exhibited at best a plateau. The reasons could lie in the applied strain-rates; while J1c tests were performed on A533B steel using 3-point bend tests on Charpy type specimens, CT specimens were used for A516 steel. However, tensile and 3-point bend tests on similar grade A516 steel of different vintage did exhibit distinct drop in the energy to fracture. Load-displacement curves during J1c tests on CT specimens did show load drops in the DSA regime. The effect of load ratio (R) on J versus load-line displacement curves for A516 steel is investigated from +1 to −1 at a fixed normalized incremental plastic displacement of 0.1 (R = 1 corresponds to monotonic loading). We note that J-values are significantly reduced with decreasing load ratio. The work-hardening characteristics on the fracture surfaces were studied following monotonic and cyclic loading fracture tests along with the stress-field analyses. From the hardness and the ball-indentation tests, it was shown that decreased load ratio (R) leads to more strain hardening at the crack tip resulting in decreased fracture toughness. From the stress field analysis near the crack tip of a compact tension fracture toughness test specimen, a cycle of tensile and compressive loads is seen to result in tensile residual stresses (which did not exist at the crack tip before). These results are important to evaluations of flawed-structures under seismic loading conditions, i.e. Leak-Before-Break (LBB) and in-service flaw evaluation criteria where seismic loading is addressed. In addition, studies on fast vs total (thermal+fast) neutron spectra revealed unexpected results due to the influence of radiation exposure on source hardening component of the yield stress; grain-size of pure iron plays a significant role in these effects.