Localized induction of bone formation is essential during orthopedic procedures that involve skeletal repair, such as surgical treatment of non-union bone fractures and degenerative disk disease.
As they report in the 29 October issue of Physical Review Letters, the scientists found that the inner part of the disk fractured sporadically, rather than deforming smoothly.
Inspired by the Brazilian disk geometry we examine the utility of an edge cracked semicircular disk (ECSD) specimen for rapid assessment of fracture toughness of brittle materials using compressive loading.
Lower back pain can be caused by any number of factors:[1] Aging Arthritis Herniated disk Compression fractures Illness, such as scoliosis.
The PPA consists of a hydraulic pump that pumps fluid and measures pressure to the nearest 100 psi, a PPA cell, a LCM receiver, a slot or tapered disk to represent the fracture in the formation, a thermostat to adjust the temperature, a thermometer that measures temperature to the nearest 1 °F and a measuring cylinder that measures fluid loss to the nearest 1 ml.
Experiments with slotted disks simulating fractures have been performed with the amount of fluid loss and sealing pressure used as evaluation criteria.
Different laboratory experimental setups with slotted disks, simulating fractures' apertures, have been used extensively to formulate effective loss circulation materials (LCM) recipes.
The present paper exposes the changes in mechanical properties of a grade API X80 steel through numerous mechanical tests, i.e. tensile tests, disk pressure test, fracture toughness and fatigue crack growth measurements, WOL tests, performed either in neutral atmosphere or in high-pressure of hydrogen gas.
A disk with no fractures was used instead of a slot disk to allow the pressure to build up in the PPA Cell.
The mechanical strength of the sample was calculated from load per unit area of the disk (kg/cm) at the fracture point.
