The fracture and fatigue characteristics of several cemented carbide grades are investigated as a function of their microstructure. In doing so, the influence of binder chemical nature and content (Co and 76wt%Co-24wt%Ni), as well as carbide grain size on hardness, flexural strength, fracture toughness and fatigue crack growth (FCG) behavior is evaluated. Mechanical testing is combined with a d...

In vivo, bone cement is subject to cyclic loading in a fluid environment. However, little is known about the effect of moisture absorption on the fatigue crack propagation resistance of bone cement. The effect of moisture absorption at 37 degrees C on the fatigue crack propagation resistance of a common bone cement (Endurance, DePuy, Orthopaedics, Inc.) was examined. Preliminary fracture toughn...

The fatigue behavior and fracture mechanisms of additively manufactured Ti-6Al-4V specimens are investigated in this study. Three sets of testing samples were fabricated for the assessment of fatigue life. The first batch of samples was built by using Laser-Engineered Net Shaping (LENS) technology, a Direct Energy Deposition (DED) method. Internal voids and defects were induced in a second batc...

In the present note, the effects of two typical organic solvents, ethanol (95~) and carbon tetrachloride (99~) , on the fatigue crack propagation rates in PMMA are discussed. Fracture mechanics which has been applied successfully to fatigue crack propagat ion in bo th metallic and polymeric sheet materials [1-4] in air is adopted in the present environmental fatigue analyses. The generalized fa...

BACKGROUND and Overview. With the increased use of nickel-titanium (NiTi) rotary instruments for root canal preparation in endodontics, instrument fracture has become more prevalent. Extensive research has been conducted on the physical properties and mechanical characteristics of NiTi rotary instruments, as well as the factors that can contribute to instrument failure. NiTi rotary instruments ...

Wave-swept macroalgae are subjected to large hydrodynamic forces as each wave breaks on shore, loads that are repeated thousands of times per day. Previous studies have shown that macroalgae can easily withstand isolated impositions of maximal field forces. Nonetheless, macroalgae break frequently. Here we investigate the possibility that repeated loading by sub-lethal forces can eventually cau...

Total Hip Replacement is a method of prosthetic reconstruction of the acetabulum and proximal femur following hip joint destruction. Prosthetic fractures have been reported after primary surgery ; with majority of them at the prosthetic stem. Few had fracture through neck of prosthetic stem. Here, we report a rare case of fracture neck of prosthetic stem within 10 year of implantation in a pati...

Although the propagation of fatigue cracks has been recognized as a problem of clinical significance in dentin, there have been few fracture mechanics-based studies that have investigated this issue. In the present study, in vitro cyclic fatigue experiments were conducted over a range of cyclic frequencies (1-50 Hz) on elephant dentin in order to quantify fatigue-crack growth behavior from the ...

Given the good response of scientific and technical communities to our previous Special Issue in Metals, titled “Fracture, Fatigue Structural Integrity Metallic Materials” (2019), given that research these fields is continuously increasing qualitative quantitative terms, this new intends provide a forum for dissemination latest significant advances fracture, fatigue structural integrity analyse...