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Mechanical Characteristics of Steel

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...

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Nitinol, Stainless Steel, and Titanium Kirschner Wire Durability.

James R Jastifer^1,2,3, Peter A Gustafson^1,2,3, Luis F Silva^1,2,3

¹Borgess Orthopedics, Kalamazoo, Michigan (JRJ, SN).

Foot & Ankle Specialist

|April 28, 2020

Summary

This summary is machine-generated.

Nitinol Kirschner wires (K wires) generally show less durability than stainless steel or titanium K wires. However, all three metals are suitable for temporary fixation in foot and ankle surgery.

Keywords:

fatigue testing hammer toe fixation

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Area of Science:

Orthopedic surgery
Biomaterials science
Mechanical engineering

Background:

Kirschner wires (K wires) are widely used for fixation in foot and ankle procedures, especially for lesser toes.
Fatigue failure is a recognized complication associated with K wire fixation.
The mechanical properties of K wires significantly influence their strength and longevity.

Purpose of the Study:

To compare the fatigue durability of Kirschner wires fabricated from stainless steel, titanium, and Nitinol.
To provide novel comparative data on the cyclic performance of different K wire materials.

Main Methods:

Cyclic durability testing was performed on ten samples each of stainless steel, titanium, and Nitinol K wires.
A rotating beam approach was employed for the durability testing.
Stress-life (S-N) curves were generated to analyze the relationship between applied stress and cycles to failure.

Main Results:

Nitinol K wires generally exhibited a shorter lifespan under equivalent applied stress compared to stainless steel and titanium wires.
Titanium K wires demonstrated superior durability at lower stress levels relative to stainless steel.
Stainless steel K wires showed greater longevity at higher stress levels compared to titanium.

Conclusions:

Significant differences in fatigue durability were observed among the three tested metals for K wire fixation.
Despite performance variations, stainless steel, titanium, and Nitinol are all considered viable options for temporary K wire fixation.
This study offers valuable comparative mechanical data for orthopedic surgeons selecting K wire materials.