Comparison of fracture strength and fracture modes of different all-ceramic crown systems is not straightforward. Established methods for reliable testing of all-ceramic crowns are not currently available. Published in-vitro tests rarely simulate clinical failure modes and are therefore unsuited to distinguish between the materials. The in-vivo trials usually lack assessment of failure modes. F...

I~VESTI~ATION OF MODES OF THERMAL FRACTURE OF SOME BRITTLE MATERIALS by CHARLES R. NELSON Submitted to the De~artment of Civil Engineering on September 2, 1969, in partial fulfillment of the requirements for the degree of Doctor of Philosophy. An analysis of the temperatures and the thermal stresses in a detailed and accurate manner with the finite element technique resulted in the following ad...

Drawing a direct analogy with the well-studied vibration or elastic modes, we introduce an object’s fracture modes , which constitute its preferred most natural ways of breaking. We formulate sparsified eigenvalue problem, solve iteratively to obtain n lowest-energy modes. These can be precomputed for given shape prefracture pattern that substitute state art realtime applications at no runtime ...

sudden fracture is one of the major failure modes in brittle materials. plexiglass (polymethyl methacrylate) is a well known brittle polymer, widely used in various industries. many types of notches, particularly v-shaped notches, are sometimes used in the components made of plexiglass. these notches can dramatically decrease the load bearing capacity of components due to the concentration of s...

Fracture surface of Zircaloy-2 specimens tested under constant crosshead speed in CH3OH/0.4 Vol. %HCI solution with and without selenium (25 ppm) addition was studied. Using a combined process of deformation and annealing, coarse grained material was also obtained and examined. Two modes of stress corrosion crack propagation were observed: an intergranular zone caused by stress assisted anodic ...

AIM To compare the fracture resistance of maxillary central incisor fragments having two different fracture patterns and re-attached using two different posts - fibre post and Ribbond. MATERIALS AND METHODS Sixty extracted human maxillary central incisors were randomly divided into two groups of thirty samples each. Group A consisted of samples with 'labio-palatal' fracture pattern and Group ...