A basic problem in the assessment of composites is the evaluation and parameterisation of the strength; with fracture mechanics, the basic parameter is the fracture energy. For composites, beam-like specimens are often used to measure the fracture energy associated with delamination. These specimens consist of a slender body partly split by a crack. Figure 1 shows examples of a number of specim...

A common cause of human disability is related to the fracture of bones, complex structural materials whose properties vary with time. An analytical study (using ANSYS, a commercial finite element package) of bones under fracture conditions is presented, focusing on the frequency variation versus depth of crack, as well as on the evolution of strength in the fracture area.

In this research, the effect of vibration at the resonant range (75 Hz) on the hardness and tensile strength of AA-5083-H321 aluminum alloy, were welded by gas metal arc welding (GMAW) investigated. Vibration forces were ranged from 850 N to 2200 N, under identical welding parameters. Tensile strength and hardness testing of welded samples were performed. After mechanical tests, the fracture su...

Introduction: Insulin dependant diabetes mellitus (IDDM) is an autoimmune disease that disrupts the body’s ability to produce insulin, and thus regulate the level of glucose in the blood. IDDM is associated with numerous systemic complications, including the impairment of fracture healing. Common problems include delayed unions, non-unions, and pseudoarthrosis. Previous studies conducted in our...

We study the asymptotic properties of fracture strength distributions of disordered elastic media by a combination of renormalization group, extreme value theory, and numerical simulation. We investigate the validity of the "weakest-link hypothesis" in the presence of realistic long-ranged interactions in the random fuse model. Numerical simulations indicate that the fracture strength is well-d...

The element of Fe can enhance the strength of TiB2/TiAl composite, but it is detrimental to the ductility of the composite due to the existence of large bulk TiB2 phase at grain boundary. The element of Mn is beneficial to the ductility of TiB2/TiAl composite, of which the fracture strain increases from 15.9 to 17.9 % with the addition of 2 at.% Mn. The element of Co can improve the strength an...

The conventional criterion for fracture risk assessment is the bone mineral density (BMD) measured by X-ray absorptiometry. Even if there is a strong association between bone strength and BMD, nowadays it is well accepted that this is not a sufficiently reliable predictor of fracture risk in osteoporotic patients. Therefore, there is a growing need for a better predictor of bone strength. Sever...

PURPOSE OF THE STUDY It is difficult to achieve a reliable bond between the titanium and veneering porcelain. The aim of this study was to evaluate the bond strength between titanium ceramic crowns. MATERIALS AND METHODS The surfaces of titanium copings were divided in two groups. Group A sandblasted with 250 um (n = 10) and Group B without sandblasting (n = 10). Low-fusing porcelain was bond...