Fatigue behavior of type 316 stainless steel under simulated body conditions

Abstract

SummaryThe fatigue-crack propagation behavior of Type 316 stainless steel wm studied under simulated body conditions. The .fatigue specimens were immersed in circulating Ringers Solution at a temperature of 98°F. Cyclic loading was accomplished a t a frequency and load waveform that corresponded to normal level walking. The concepts of linear elastic fracture mechanics were used t o evaluate the fatigue behavior, and it waa found that the crack-growth rate was higher under simulated body conditions than for a corresponding test conducted under ambient air conditions.

Fatigue Analysis of Plates Used for Fracture Stabilization in Small Dogs and Cats

“…3 These factors are also likely very important for implant life in stabilizing fractures in small animals. Other factors that influence fatigue life of bone plates include environmental factors (e.g., exposure to chloride ions and changes in pH that occur in vivo), 3,7 techniques used in manufacturing, and contouring before implantation. 3 We chose to evaluate fatigue life in our model because it more closely emulates in vivo forces on a plate during recovery.…”

Metallurgical failure analysis of various implant materials used in orthopedic applications

“…[32][33][34] Despite numerous investigations, the occurrence of such failures is still a major problem. A variety of micrographic features were observed on the fractured or mechanially damaged surfaces and through microscopic indications.…”

“…In nearly all prosthetic devices, and particularly those having multicomponents, the regions of stress concentration often coincide with crevice areas, where localized corrosion is more likely. [32] The adverse effects of implant-derived wear particles on periprosthetic tissues are also important in bone loss and loosening of implant prostheses. Early loosening is related to poor initial fixation and design; late loosening, which is the major problem and principal cause of failure, is related to wear of the prosthetic components.…”

Thermomechanical Effects of Spine Surgery Rods Composed of Different Metals and Alloys

“…These are a likely combination of different factors such as temperature, biochemical environment, cyclic mechanical stress as function of body movement, and strain accumulated in the material as result of contouring before implantation, may contribute to this effect. 13,[14][15][16][17][18] We assumed that the revealed tip displacement and corresponding shape loss refl ect a summary release of strain accumulated in rods as a result of contouring and features of material microstructure, which are also linked with the metal fatigue properties, in particular number of micro injuries (cracks) accumulated …”